WO2022172549A1 - Information processing device, information processing method, and information processing program - Google Patents

Information processing device, information processing method, and information processing program Download PDF

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Publication number
WO2022172549A1
WO2022172549A1 PCT/JP2021/042670 JP2021042670W WO2022172549A1 WO 2022172549 A1 WO2022172549 A1 WO 2022172549A1 JP 2021042670 W JP2021042670 W JP 2021042670W WO 2022172549 A1 WO2022172549 A1 WO 2022172549A1
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control
partition
magnetic tape
recorded
metadata
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PCT/JP2021/042670
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French (fr)
Japanese (ja)
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豊 大石
理貴 近藤
優子 宇野
美咲 大塚
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富士フイルム株式会社
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Priority to JP2022581193A priority Critical patent/JPWO2022172549A1/ja
Publication of WO2022172549A1 publication Critical patent/WO2022172549A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/10—File systems; File servers
    • G06F16/18—File system types
    • G06F16/185—Hierarchical storage management [HSM] systems, e.g. file migration or policies thereof
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers

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  • the present disclosure relates to an information processing device, an information processing method, and an information processing program.
  • Japanese Patent Application Laid-Open No. 2015-103033 discloses a technique of dividing data partitions of a magnetic tape having index partitions and data partitions into a plurality of partitions and reclaiming data recorded on the magnetic tape.
  • Republished Publication No. 2008-146473 discloses a memory card having a first recording area for recording file management information and a second recording area for recording data itself.
  • a directory for video files and a directory for audio files are created in the first recording area according to the ratio between the number of video files and the number of audio files generated in one recording by the recording device. and the number of files that can be recorded in the directory.
  • recent magnetic tapes can be divided into, for example, a first partition in which data is recorded and a second partition in which metadata about data is recorded.
  • a data group is recorded in the first partition
  • a metadata group is recorded in the second partition.
  • the size of data varies depending on the data, but the size of metadata does not depend on the data and fluctuates less than the size of the data. That is, the ratio between the total size of metadata recorded in the second partition and the total size of data recorded in the first partition may differ from magnetic tape to magnetic tape. Therefore, for example, the capacity utilization of the second partition is relatively low, the capacity utilization of the first partition is relatively high, and the magnetic tape, and the capacity utilization of the first partition is relatively low, A magnetic tape with a relatively high capacity utilization rate of the second partition is generated. In this case, if the data is transferred from the source magnetic tape to the destination magnetic tape as it is, it is not efficient.
  • the techniques described in Japanese Unexamined Patent Application Publication No. 2015-103033 and Republished Japanese Patent Application Publication No. 2008-146473 do not consider efficient data migration of magnetic tapes.
  • the present disclosure has been made in view of the above circumstances, and aims to provide an information processing device, an information processing method, and an information processing program that can efficiently perform data migration on magnetic tapes.
  • An information processing apparatus is an object including at least one of data and metadata related to the data, and has a first partition in which one or more objects are recorded and a second partition in which metadata is recorded.
  • An information processing apparatus comprising at least one processor for controlling data migration from a magnetic tape, wherein the processor stores the total size of the object group recorded in the first partition and the second partition on the migration source magnetic tape. If there are multiple magnetic tapes whose ratio to the total size of the metadata group recorded in the partition is outside a certain range, perform the first control to read the metadata group and object group from the multiple magnetic tapes , the metadata group obtained by the first control is recorded in the second partition of the migration destination magnetic tape, and the object group obtained by the first control is recorded in the first partition of the migration destination magnetic tape. A second control for recording is performed.
  • the processor may perform control to read the metadata group and the object group from a plurality of magnetic tapes in parallel using a plurality of tape drives.
  • the processor in the second control, controls to record the metadata group and the object group in parallel on a plurality of migration destination magnetic tapes using a plurality of tape drives. good.
  • the processor equalizes the above-mentioned ratios of the magnetic tapes of the plurality of migration destinations, the metadata group and the object obtained by the first control.
  • the group may be controlled to be recorded on a plurality of destination magnetic tapes.
  • the processor performs the first control and the second When the usage rate is equal to or higher than the threshold, a third control is performed to read the metadata group and the object group from the magnetic tape whose ratio is within a certain range using one tape drive, and the third control is performed. recording the metadata group obtained by the control in the second partition of the migration destination magnetic tape, and recording the object group obtained by the third control in the first partition of the migration destination magnetic tape; may be controlled.
  • the processor provides a usage rate indicating a ratio of tape drives in use among a plurality of tape drives, and the usage rate of the tape drives within a predetermined period is relative The ratio is within a certain range by performing the first control and the second control during a time period when the usage rate is relatively low, and using one tape drive during a time period when the usage rate is relatively high within the period.
  • a third control is performed to read the metadata group and the object group from the tape, the metadata group obtained by the third control is recorded in the second partition of the migration destination magnetic tape, and the metadata group is obtained by the third control.
  • a fourth control may be performed to record the object group that has been transferred to the first partition of the migration destination magnetic tape.
  • the processor when the processor performs control to multiplex and record data on a plurality of magnetic tapes of the migration destination, at least one magnetic tape of a portion of the plurality of magnetic tapes
  • the second control may be performed on the remaining tapes, and control may be performed to duplicate and record the data from the at least one magnetic tape on the remaining tapes.
  • the information processing method of the present disclosure is an object including at least one of data and metadata related to the data, a first partition in which one or more objects are recorded and a second partition in which metadata is recorded.
  • a first control of reading is performed, the metadata group obtained by the first control is recorded in the second partition of the magnetic tape of the migration destination, and the object group obtained by the first control is recorded in the magnetic tape of the migration destination.
  • the second control is to record in the first partition of the tape.
  • the information processing program of the present disclosure is an object including at least one of data and metadata related to the data, and includes a first partition in which one or more objects are recorded and a second partition in which metadata is recorded.
  • An information processing program to be executed by a processor of an information processing device comprising at least one processor for controlling data migration from a magnetic tape having If there are multiple magnetic tapes whose ratio between the total size of the object group and the total size of the metadata group recorded in the second partition is outside a certain range, the metadata group and object perform a first control to read the group, record the metadata group obtained by the first control in the second partition of the magnetic tape of the transfer destination, and record the object group obtained by the first control to the transfer destination; second control for recording in the first partition of the magnetic tape.
  • FIG. 1 is a block diagram showing an example of the configuration of an information processing system;
  • FIG. FIG. 4 is a diagram for explaining an object;
  • FIG. It is a schematic diagram which shows an example of a magnetic tape.
  • FIG. 2 is a schematic diagram showing an example of the hardware constitutions of an information processing apparatus.
  • FIG. 2 is a schematic diagram showing an example of metadata on a magnetic tape and a recording state of an object;
  • FIG. 2 is a schematic diagram showing an example of metadata on a magnetic tape and a recording state of an object;
  • 1 is a block diagram showing an example of a functional configuration of an information processing device;
  • FIG. It is a figure for demonstrating 1st control and 2nd control. It is a figure for demonstrating 3rd control and 4th control.
  • 6 is a flowchart illustrating an example of data migration processing;
  • FIG. 4 is a diagram for explaining an example of processing for multiplexing and recording data;
  • the information processing system 10 includes an information processing device 12 and a tape library 14 .
  • the information processing device 12 include a server computer and the like.
  • the tape library 14 comprises a plurality of slots (not shown) and a plurality of tape drives 18, each slot storing a magnetic tape T as an example of a recording medium.
  • Each tape drive 18 is connected to the information processing device 12 .
  • the tape drive 18 writes data to or reads data from the magnetic tape T under the control of the information processing device 12 .
  • An example of the magnetic tape T is an LTO (Linear Tape-Open) tape.
  • the magnetic tape T to be written or read is loaded from the slot into the predetermined tape drive 18 .
  • the magnetic tape T is unloaded from the tape drive 18 to the slot in which it was originally stored.
  • a unit handling data to be recorded on the magnetic tape T includes data to be stored by the user, such as document data and image data, and metadata related to the data.
  • data to be stored by the user such as document data and image data
  • metadata is written as "meta".
  • a storage system that handles this object is called an object storage system.
  • the metadata includes, for example, object identification information such as object keys, object names, data sizes, and attribute information such as time stamps.
  • the recording order of the data and the metadata when recording the object on the magnetic tape T is not particularly limited, and may be the order of the metadata and the data, or the order of the data and the metadata.
  • the configuration of the magnetic tape T according to this embodiment will be described with reference to FIG.
  • the magnetic tape T is formatted, it is divided into two partitions, a reference partition RP in which metadata is recorded and a data partition DP in which objects are recorded.
  • the data partition DP is an example of a first partition in which objects are recorded
  • the reference partition RP is an example of a second partition in which metadata is recorded.
  • the objects recorded in the data partition DP there may be objects containing only data, or objects containing only metadata.
  • the information processing device 12 includes a CPU (Central Processing Unit) 20, a memory 21 as a temporary storage area, and a non-volatile storage section 22.
  • FIG. The information processing device 12 also includes a display 23 such as a liquid crystal display, an input device 24 such as a keyboard and a mouse, a network I/F (InterFace) 25 connected to a network, and an external I/F to which each tape drive 18 is connected.
  • a display 23 such as a liquid crystal display
  • an input device 24 such as a keyboard and a mouse
  • a network I/F (InterFace) 25 connected to a network
  • an external I/F to which each tape drive 18 is connected.
  • Including F26 CPU 20 , memory 21 , storage unit 22 , display 23 , input device 24 , network I/F 25 and external I/F 26 are connected to bus 27 .
  • the storage unit 22 is implemented by a HDD (Hard Disk Drive), SSD (Solid State Drive), flash memory, or the like.
  • An information processing program 30 is stored in the storage unit 22 as a storage medium.
  • the CPU 20 reads out the information processing program 30 from the storage unit 22 , expands it in the memory 21 , and executes the expanded information processing program 30 .
  • data is migrated from a plurality of source magnetic tapes T to a plurality of destination magnetic tapes T.
  • FIG. Hereinafter, when distinguishing between the source magnetic tape T and the destination magnetic tape T, the source magnetic tape T will be referred to as “magnetic tape T1" and the destination magnetic tape T will be referred to as “magnetic tape T2". It says. Both the magnetic tape T1 and the magnetic tape T2 are stored in slots of the tape library 14.
  • FIG. Data to be transferred is recorded on the magnetic tape T1.
  • the magnetic tape T2 is a new magnetic tape T on which no data is recorded.
  • the purpose of data migration is, for example, to increase the free space of magnetic tape T1 where the total size of logically deleted data has reached a certain value or more. Further, as a purpose of data migration, for example, data recorded on the old-generation magnetic tape T1 is migrated to the new-generation magnetic tape T2, and data recorded on the magnetic tape T1 whose error rate has increased due to deterioration over time. Another example is to migrate the data that has been recorded to a new magnetic tape T2.
  • each magnetic tape T1 is associated in advance with the destination magnetic tape T2 based on the total size of data recorded on the magnetic tape T1 and the size of data recordable on the magnetic tape T2.
  • a magnetic tape T on which a lot of objects including data of relatively small size and metadata related to the data are recorded may be in the following state. That is, in such a magnetic tape T, there is a case where the data partition DP still has space, but the reference partition RP has no space, and a new object cannot be recorded on the magnetic tape T.
  • the information processing apparatus 12 has a function of migrating data from the magnetic tape T1 based on the ratio between the total size of the object group recorded on the magnetic tape T1 and the total size of the metadata group. .
  • the information processing device 12 includes a determination section 40 , a first control section 42 , a second control section 44 , a third control section 46 and a fourth control section 48 .
  • the CPU 20 functions as a determination section 40 , a first control section 42 , a second control section 44 , a third control section 46 and a fourth control section 48 .
  • the determination unit 40 determines whether the ratio H1 between the total size of the object group recorded in the data partition DP and the total size of the metadata group recorded in the reference partition RP is within a certain range for each of the plurality of magnetic tapes T1. or out of range.
  • This fixed range is, for example, a fixed range around the ratio H2 between the size of the data partition DP and the size of the reference partition RP of the magnetic tape T2. As a specific example, when the ratio H2 is "96:4", the fixed range is from "95.8:4.2" to "96.2:3.8".
  • the object group recorded in the data partition DP here means all the objects recorded in the data partition DP.
  • the metadata group recorded in the reference partition RP here means all the metadata recorded in the reference partition RP.
  • the size of the data partition DP means the upper limit of the data size recordable in the data partition DP.
  • the size of the reference partition RP means the upper limit of the data size recordable in the reference partition RP.
  • the determination unit 40 determines whether or not there are a plurality of magnetic tapes T1 whose ratio H1 is outside a certain range among all the magnetic tapes T1 to be transferred.
  • the first control unit 42 controls reading of the metadata group and the object group from the plurality of magnetic tapes T1 (hereinafter referred to as “first control”). In this first control, the first control unit 42 controls parallel reading of metadata groups and object groups from a plurality of magnetic tapes T1 using a plurality of tape drives 18 .
  • the second control unit 44 records the metadata group obtained by the first control by the first control unit 42 on the reference partition RP of the magnetic tape T2, and records the object group obtained by the first control on the magnetic tape.
  • Control for recording in the data partition DP of T2 (hereinafter referred to as "second control") is performed.
  • the second control unit 44 controls parallel recording of a metadata group and an object group on a plurality of magnetic tapes T2 using a plurality of tape drives 18 .
  • the second control unit 44 divides the metadata group and the object group obtained by the first control into a plurality of It controls recording on the magnetic tape T2.
  • the third control unit 46 uses one tape drive 18 to extract the metadata group and the object group from the magnetic tape T1 for which the determination unit 40 has determined that the ratio H1 is within a certain range. Read control (hereinafter referred to as “third control”) is performed. Further, when the determination unit 40 determines that there is one magnetic tape T1 whose ratio H1 is outside the predetermined range, the third control unit 46 also performs the third control for that one magnetic tape T1. .
  • the fourth control unit 48 records the metadata group obtained by the third control by the third control unit 46 on the reference partition RP of the magnetic tape T2, and records the object group obtained by the third control on the magnetic tape. Control for recording in the data partition DP of T2 (hereinafter referred to as "fourth control") is performed.
  • first control, second control, third control, and fourth control will be described with reference to FIGS.
  • FIGS. 8 and 9 it is assumed here that there are three source magnetic tapes T1 and three target magnetic tapes T2. Further, the ratios H1 of the three magnetic tapes T1 are "93:7", “99:1" and "96:4", and the ratio H2 of the three magnetic tapes T2 are all "96:4". and the certain range is from “95.8:4.2" to "96.2:3.8".
  • the third control and the fourth control are performed for the magnetic tape T1 whose ratio H1 is within a certain range. Therefore, in this case, the ratio H1 is also within a certain range around the ratio H2 in the magnetic tape T2.
  • the data migration process shown in FIG. 10 is executed by the CPU 20 executing the information processing program 30 .
  • the data migration process shown in FIG. 10 is executed, for example, when an execution instruction is input by the user. At this time, for example, the user inputs the identification information of the magnetic tape T1 to be transferred.
  • step S10 of FIG. 10 the determination unit 40 determines whether the ratio H1 is within a certain range or out of the range for each of the plurality of magnetic tapes T1 to be transferred, as described above. For the magnetic tape T1 whose ratio H1 is determined to be outside the predetermined range by the determining unit 40, the process proceeds to step S12, and for the magnetic tape T1 whose ratio H1 is determined to be within the predetermined range, The process moves to step S18.
  • step S12 the determination unit 40 determines whether or not there are a plurality of magnetic tapes T1 for which the ratio H1 was determined to be outside the certain range in step S10. If this determination is affirmative, the process proceeds to step S14, and if it is negative, the process proceeds to step S18.
  • the processes of steps S14 and S16 are executed for the multiple magnetic tapes T1.
  • the processing of steps S18 and S20 is executed for that one magnetic tape T1.
  • the processing of steps S18 and S20 is also executed for each magnetic tape T1 for which the ratio H1 is determined to be within a certain range.
  • the first control unit 42 performs the first control on the plurality of magnetic tapes T1 for which the ratio H1 is determined to be within a certain range, as described above.
  • the second control unit 44 performs second control using the metadata group and object group obtained by the first control in step S14, as described above.
  • step S18 the third control unit 46 performs the third control on the magnetic tape T1 as described above.
  • step S20 the fourth control unit 48 performs fourth control using the metadata group and object group obtained by the third control in step S18, as described above.
  • the ratio H1 is within a certain range centered on the ratio H2, or the ratio H1 is within the ratio H1 compared to the magnetic tape T1. close to H2. Therefore, the data migration of the magnetic tape T1 can be efficiently performed.
  • the first control unit 42 when the usage rate S indicating the ratio of the tape drives 18 in use among the plurality of tape drives 18 is less than the predetermined threshold value TH, the first control unit 42 The control may be performed, and the second control section 44 may perform the second control. Further, when the usage rate S is equal to or higher than the threshold TH, the third control section 46 may perform the third control and the fourth control section 48 may perform the fourth control.
  • the plurality of tape drives 18 may be all the tape drives 18 provided in the tape library 14, or some of the tape drives 18 assigned for data migration among all the tape drives 18 provided in the tape library 14. good.
  • the first control unit 42 performs the first control and the second control unit 44 may perform the second control.
  • the third control unit 46 may perform the third control and the fourth control unit 48 may perform the fourth control during a time period in which the usage rate S is relatively high within the period TM.
  • the usage rate S in these examples for example, the usage rate immediately before may be used, or the actual value of the usage rate in the same time period in the past may be used.
  • the second control unit 44 performs control to multiplex and record data on a plurality of magnetic tapes T2 of the migration destination.
  • the second control may be performed on at least one magnetic tape T2.
  • the second control unit 44 performs control to duplicate and record data from at least one magnetic tape T2 on the remaining magnetic tapes T2.
  • FIG. 11 when the same data is multiplexed and recorded on three magnetic tapes T2, the data is first recorded on one magnetic tape T2, and then the data is recorded on the remaining two magnetic tapes T2 from that one magnetic tape T2.
  • An example of duplicating data on the magnetic tape T2 of a book is shown.
  • a processing unit that executes various processes such as the determination unit 40, the first control unit 42, the second control unit 44, the third control unit 46, and the fourth control unit 48
  • various processors shown below can be used as the hardware structure of .
  • the various processors include, in addition to the CPU, which is a general-purpose processor that executes software (programs) and functions as various processing units, circuits such as FPGAs (Field Programmable Gate Arrays), etc.
  • Programmable Logic Device which is a processor whose configuration can be changed, ASIC (Application Specific Integrated Circuit) etc. Circuits, etc. are included.
  • One processing unit may be composed of one of these various processors, or a combination of two or more processors of the same type or different types (for example, a combination of multiple FPGAs, a combination of a CPU and an FPGA). combination). Also, a plurality of processing units may be configured by one processor.
  • a single processor is configured by combining one or more CPUs and software.
  • a processor functions as multiple processing units.
  • SoC System on Chip
  • the various processing units are configured using one or more of the above various processors as a hardware structure.
  • an electric circuit combining circuit elements such as semiconductor elements can be used.
  • the information processing program 30 has been pre-stored (installed) in the storage unit 22, but the present invention is not limited to this.
  • the information processing program 30 is provided in a form recorded on a recording medium such as a CD-ROM (Compact Disc Read Only Memory), a DVD-ROM (Digital Versatile Disc Read Only Memory), and a USB (Universal Serial Bus) memory. good too. Further, the information processing program 30 may be downloaded from an external device via a network.

Abstract

When multiple magnetic tapes for which the ratio between the total size of an object group recorded in a first partition and the total size of a metadata group recorded in a second partition is outside a fixed range are present among migration-source magnetic tapes, this information processing device: performs a first control for reading the metadata group and the object group from the plurality of magnetic tapes; records the metadata group obtained in the first control to the second partition of migration-destination magnetic tapes; and performs a second control for recording the object group obtained in the first control to the first partition of the migration-destination magnetic tapes.

Description

情報処理装置、情報処理方法、及び情報処理プログラムInformation processing device, information processing method, and information processing program
　本開示は、情報処理装置、情報処理方法、及び情報処理プログラムに関する。 The present disclosure relates to an information processing device, an information processing method, and an information processing program.
　特開２０１５－１０３０３３号公報には、インデックスパーティション及びデータパーティションを有する磁気テープのデータパーティションを複数のパーティションに区分けし、磁気テープに記録されたデータをリクラメーションする技術が開示されている。 Japanese Patent Application Laid-Open No. 2015-103033 discloses a technique of dividing data partitions of a magnetic tape having index partitions and data partitions into a plurality of partitions and reclaiming data recorded on the magnetic tape.
　再公表２００８－１４６４７３号公報には、ファイル管理情報を記録する第１の記録領域と、データ本体を記録する第２の記録領域とを有するメモリカードが開示されている。このメモリカードでは、録画機器による１回の録画で生成されるビデオファイルの数とオーディオファイルの数との比に応じて、第１の記録領域に作成するビデオファイル用のディレクトリと、オーディオファイル用のディレクトリに記録可能なファイル数とが決定される。 Republished Publication No. 2008-146473 discloses a memory card having a first recording area for recording file management information and a second recording area for recording data itself. In this memory card, a directory for video files and a directory for audio files are created in the first recording area according to the ratio between the number of video files and the number of audio files generated in one recording by the recording device. and the number of files that can be recorded in the directory.
　ところで、近年の磁気テープは、例えば、データが記録される第１のパーティションと、データに関するメタデータが記録される第２のパーティションとに、領域を分割することが可能となっている。また、このような磁気テープにおいて、第１のパーティションにはデータ群が記録され、第２のパーティションにはメタデータ群が記録される。 By the way, recent magnetic tapes can be divided into, for example, a first partition in which data is recorded and a second partition in which metadata about data is recorded. In such a magnetic tape, a data group is recorded in the first partition, and a metadata group is recorded in the second partition.
　一般的に、データのサイズはデータによって様々であるが、メタデータのサイズはデータによらず、データのサイズに比べれば変動が小さい。すなわち、第２のパーティションに記録されたメタデータのトータルサイズと、第１のパーティションに記録されたデータのトータルサイズとの比は、磁気テープ毎に異なる場合がある。従って、例えば、第２のパーティションの容量使用率は比較的低いのに、第１のパーティションの容量使用率は比較的高い磁気テープ、及び第１のパーティションの容量使用率は比較的低いのに、第２のパーティションの容量使用率は比較的高い磁気テープが発生してしまう。この場合、移行元の磁気テープから移行先の磁気テープにそのままデータを移行してしまうと、効率的ではない。特開２０１５－１０３０３３号公報及び再公表２００８－１４６４７３号公報に記載の技術は、磁気テープの効率的なデータ移行については考慮されていない。 In general, the size of data varies depending on the data, but the size of metadata does not depend on the data and fluctuates less than the size of the data. That is, the ratio between the total size of metadata recorded in the second partition and the total size of data recorded in the first partition may differ from magnetic tape to magnetic tape. Therefore, for example, the capacity utilization of the second partition is relatively low, the capacity utilization of the first partition is relatively high, and the magnetic tape, and the capacity utilization of the first partition is relatively low, A magnetic tape with a relatively high capacity utilization rate of the second partition is generated. In this case, if the data is transferred from the source magnetic tape to the destination magnetic tape as it is, it is not efficient. The techniques described in Japanese Unexamined Patent Application Publication No. 2015-103033 and Republished Japanese Patent Application Publication No. 2008-146473 do not consider efficient data migration of magnetic tapes.
　本開示は、以上の事情を鑑みてなされたものであり、磁気テープのデータ移行を効率的に行うことができる情報処理装置、情報処理方法、及び情報処理プログラムを提供することを目的とする。 The present disclosure has been made in view of the above circumstances, and aims to provide an information processing device, an information processing method, and an information processing program that can efficiently perform data migration on magnetic tapes.
　本開示の情報処理装置は、データ及びデータに関するメタデータの少なくとも一方を含むオブジェクトであって、一つ以上のオブジェクトが記録される第１のパーティション及びメタデータが記録される第２のパーティションを有する磁気テープからデータを移行する制御を行う少なくとも一つのプロセッサを備える情報処理装置であって、プロセッサは、移行元の磁気テープに、第１のパーティションに記録されたオブジェクト群のトータルサイズと、第２のパーティションに記録されたメタデータ群のトータルサイズとの比が一定の範囲外である磁気テープが複数存在する場合、その複数の磁気テープからメタデータ群及びオブジェクト群を読み取る第１の制御を行い、第１の制御によって得られたメタデータ群を移行先の磁気テープの第２のパーティションに記録し、かつ第１の制御によって得られたオブジェクト群を移行先の磁気テープの第１のパーティションに記録する第２の制御を行う。 An information processing apparatus according to the present disclosure is an object including at least one of data and metadata related to the data, and has a first partition in which one or more objects are recorded and a second partition in which metadata is recorded. An information processing apparatus comprising at least one processor for controlling data migration from a magnetic tape, wherein the processor stores the total size of the object group recorded in the first partition and the second partition on the migration source magnetic tape. If there are multiple magnetic tapes whose ratio to the total size of the metadata group recorded in the partition is outside a certain range, perform the first control to read the metadata group and object group from the multiple magnetic tapes , the metadata group obtained by the first control is recorded in the second partition of the migration destination magnetic tape, and the object group obtained by the first control is recorded in the first partition of the migration destination magnetic tape. A second control for recording is performed.
　なお、本開示の情報処理装置は、プロセッサが、第１の制御において、複数のテープドライブを用いて複数の磁気テープからメタデータ群及びオブジェクト群を並列に読み取る制御を行ってもよい。 In the information processing apparatus of the present disclosure, in the first control, the processor may perform control to read the metadata group and the object group from a plurality of magnetic tapes in parallel using a plurality of tape drives.
　また、本開示の情報処理装置は、プロセッサが、第２の制御において、複数のテープドライブを用いて複数の移行先の磁気テープにメタデータ群及びオブジェクト群を並列に記録する制御を行ってもよい。 Further, in the information processing apparatus of the present disclosure, the processor, in the second control, controls to record the metadata group and the object group in parallel on a plurality of migration destination magnetic tapes using a plurality of tape drives. good.
　また、本開示の情報処理装置は、プロセッサが、第２の制御において、複数の移行先の磁気テープの上記比が平準化されるように、第１の制御によって得られたメタデータ群及びオブジェクト群を複数の移行先の磁気テープに記録する制御を行ってもよい。 Further, in the information processing apparatus of the present disclosure, in the second control, the processor equalizes the above-mentioned ratios of the magnetic tapes of the plurality of migration destinations, the metadata group and the object obtained by the first control. The group may be controlled to be recorded on a plurality of destination magnetic tapes.
　また、本開示の情報処理装置は、プロセッサが、複数のテープドライブのうちの使用されているテープドライブの割合を示す使用率が予め定められた閾値未満の場合、第１の制御及び第２の制御を行い、使用率が閾値以上の場合、１つのテープドライブを用いて、上記比が一定の範囲内である磁気テープからメタデータ群及びオブジェクト群を読み取る第３の制御を行い、第３の制御によって得られたメタデータ群を移行先の磁気テープの第２のパーティションに記録し、かつ第３の制御によって得られたオブジェクト群を移行先の磁気テープの第１のパーティションに記録する第４の制御を行ってもよい。 Further, in the information processing apparatus of the present disclosure, the processor performs the first control and the second When the usage rate is equal to or higher than the threshold, a third control is performed to read the metadata group and the object group from the magnetic tape whose ratio is within a certain range using one tape drive, and the third control is performed. recording the metadata group obtained by the control in the second partition of the migration destination magnetic tape, and recording the object group obtained by the third control in the first partition of the migration destination magnetic tape; may be controlled.
　また、本開示の情報処理装置は、プロセッサが、複数のテープドライブのうちの使用されているテープドライブの割合を示す使用率であって、予め定められた期間内におけるテープドライブの使用率が相対的に低い時間帯に第１の制御及び第２の制御を行い、上記期間内における使用率が相対的に高い時間帯に１つのテープドライブを用いて、上記比が一定の範囲内である磁気テープからメタデータ群及びオブジェクト群を読み取る第３の制御を行い、第３の制御によって得られたメタデータ群を移行先の磁気テープの第２のパーティションに記録し、かつ第３の制御によって得られたオブジェクト群を移行先の磁気テープの第１のパーティションに記録する第４の制御を行ってもよい。 Further, in the information processing apparatus of the present disclosure, the processor provides a usage rate indicating a ratio of tape drives in use among a plurality of tape drives, and the usage rate of the tape drives within a predetermined period is relative The ratio is within a certain range by performing the first control and the second control during a time period when the usage rate is relatively low, and using one tape drive during a time period when the usage rate is relatively high within the period. A third control is performed to read the metadata group and the object group from the tape, the metadata group obtained by the third control is recorded in the second partition of the migration destination magnetic tape, and the metadata group is obtained by the third control. A fourth control may be performed to record the object group that has been transferred to the first partition of the migration destination magnetic tape.
　また、本開示の情報処理装置は、プロセッサが、移行先の複数の磁気テープにデータを多重化して記録する制御を行う場合、その複数の磁気テープの一部の少なくとも１本の磁気テープに対して第２の制御を行い、かつ残りのテープに対しては、その少なくとも１本の磁気テープからデータを複製して記録する制御を行ってもよい。 Further, in the information processing apparatus of the present disclosure, when the processor performs control to multiplex and record data on a plurality of magnetic tapes of the migration destination, at least one magnetic tape of a portion of the plurality of magnetic tapes The second control may be performed on the remaining tapes, and control may be performed to duplicate and record the data from the at least one magnetic tape on the remaining tapes.
　また、本開示の情報処理方法は、データ及びデータに関するメタデータの少なくとも一方を含むオブジェクトであって、一つ以上のオブジェクトが記録される第１のパーティション及びメタデータが記録される第２のパーティションを有する磁気テープからデータを移行する制御を行う少なくとも一つのプロセッサを備える情報処理装置のプロセッサが実行する情報処理方法であって、移行元の磁気テープに、第１のパーティションに記録されたオブジェクト群のトータルサイズと、第２のパーティションに記録されたメタデータ群のトータルサイズとの比が一定の範囲外である磁気テープが複数存在する場合、その複数の磁気テープからメタデータ群及びオブジェクト群を読み取る第１の制御を行い、第１の制御によって得られたメタデータ群を移行先の磁気テープの第２のパーティションに記録し、かつ第１の制御によって得られたオブジェクト群を移行先の磁気テープの第１のパーティションに記録する第２の制御を行うものである。 Further, the information processing method of the present disclosure is an object including at least one of data and metadata related to the data, a first partition in which one or more objects are recorded and a second partition in which metadata is recorded. An information processing method executed by a processor of an information processing apparatus including at least one processor for controlling data migration from a magnetic tape having and the total size of the metadata group recorded in the second partition is outside a certain range, if there are multiple magnetic tapes, the metadata group and object group can be extracted from these magnetic tapes. A first control of reading is performed, the metadata group obtained by the first control is recorded in the second partition of the magnetic tape of the migration destination, and the object group obtained by the first control is recorded in the magnetic tape of the migration destination. The second control is to record in the first partition of the tape.
　また、本開示の情報処理プログラムは、データ及びデータに関するメタデータの少なくとも一方を含むオブジェクトであって、一つ以上のオブジェクトが記録される第１のパーティション及びメタデータが記録される第２のパーティションを有する磁気テープからデータを移行する制御を行う少なくとも一つのプロセッサを備える情報処理装置のプロセッサに実行させるための情報処理プログラムであって、移行元の磁気テープに、第１のパーティションに記録されたオブジェクト群のトータルサイズと、第２のパーティションに記録されたメタデータ群のトータルサイズとの比が一定の範囲外である磁気テープが複数存在する場合、その複数の磁気テープからメタデータ群及びオブジェクト群を読み取る第１の制御を行い、第１の制御によって得られたメタデータ群を移行先の磁気テープの第２のパーティションに記録し、かつ第１の制御によって得られたオブジェクト群を移行先の磁気テープの第１のパーティションに記録する第２の制御を行うものである。 Further, the information processing program of the present disclosure is an object including at least one of data and metadata related to the data, and includes a first partition in which one or more objects are recorded and a second partition in which metadata is recorded. An information processing program to be executed by a processor of an information processing device comprising at least one processor for controlling data migration from a magnetic tape having If there are multiple magnetic tapes whose ratio between the total size of the object group and the total size of the metadata group recorded in the second partition is outside a certain range, the metadata group and object perform a first control to read the group, record the metadata group obtained by the first control in the second partition of the magnetic tape of the transfer destination, and record the object group obtained by the first control to the transfer destination; second control for recording in the first partition of the magnetic tape.
　本開示によれば、磁気テープのデータ移行を効率的に行うことができる。 According to the present disclosure, it is possible to efficiently migrate data on magnetic tapes.
情報処理システムの構成の一例を示すブロック図である。1 is a block diagram showing an example of the configuration of an information processing system; FIG. オブジェクトを説明するための図である。FIG. 4 is a diagram for explaining an object; FIG. 磁気テープの一例を示す模式図である。It is a schematic diagram which shows an example of a magnetic tape. 情報処理装置のハードウェア構成の一例を示すブロック図である。It is a block diagram which shows an example of the hardware constitutions of an information processing apparatus. 磁気テープのメタデータ及びオブジェクトの記録状態の一例を示す模式図である。FIG. 2 is a schematic diagram showing an example of metadata on a magnetic tape and a recording state of an object; 磁気テープのメタデータ及びオブジェクトの記録状態の一例を示す模式図である。FIG. 2 is a schematic diagram showing an example of metadata on a magnetic tape and a recording state of an object; 情報処理装置の機能的な構成の一例を示すブロック図である。1 is a block diagram showing an example of a functional configuration of an information processing device; FIG. 第１の制御及び第２の制御を説明するための図である。It is a figure for demonstrating 1st control and 2nd control. 第３の制御及び第４の制御を説明するための図である。It is a figure for demonstrating 3rd control and 4th control. データ移行処理の一例を示すフローチャートである。6 is a flowchart illustrating an example of data migration processing; データを多重化して記録する処理の一例を説明するための図である。FIG. 4 is a diagram for explaining an example of processing for multiplexing and recording data;
　以下、図面を参照して、本開示の技術を実施するための形態例を詳細に説明する。 Embodiments for implementing the technology of the present disclosure will be described in detail below with reference to the drawings.
　まず、図１を参照して、本実施形態に係る情報処理システム１０の構成を説明する。図１に示すように、情報処理システム１０は、情報処理装置１２及びテープライブラリ１４を含む。情報処理装置１２の例としては、サーバコンピュータ等が挙げられる。 First, the configuration of an information processing system 10 according to the present embodiment will be described with reference to FIG. As shown in FIG. 1, the information processing system 10 includes an information processing device 12 and a tape library 14 . Examples of the information processing device 12 include a server computer and the like.
　テープライブラリ１４は、複数のスロット（図示省略）及び複数のテープドライブ１８を備え、各スロットには記録媒体の一例としての磁気テープＴが格納される。各テープドライブ１８は、情報処理装置１２に接続される。テープドライブ１８は、情報処理装置１２による制御によって、磁気テープＴに対するデータの書き込み又は読み取りを行う。磁気テープＴの例としては、ＬＴＯ（Linear Tape-Open）テープが挙げられる。 The tape library 14 comprises a plurality of slots (not shown) and a plurality of tape drives 18, each slot storing a magnetic tape T as an example of a recording medium. Each tape drive 18 is connected to the information processing device 12 . The tape drive 18 writes data to or reads data from the magnetic tape T under the control of the information processing device 12 . An example of the magnetic tape T is an LTO (Linear Tape-Open) tape.
　情報処理装置１２により磁気テープＴに対するデータの書き込み又は読み取りを行う場合、書き込み又は読み取り対象の磁気テープＴがスロットから所定のテープドライブ１８にロードされる。テープドライブ１８にロードされた磁気テープＴに対するデータの書き込み又は読み取りが完了すると、磁気テープＴは、テープドライブ１８から元々格納されていたスロットにアンロードされる。 When the information processing device 12 writes data to or reads data from the magnetic tape T, the magnetic tape T to be written or read is loaded from the slot into the predetermined tape drive 18 . After data has been written or read from the magnetic tape T loaded in the tape drive 18, the magnetic tape T is unloaded from the tape drive 18 to the slot in which it was originally stored.
　本実施形態では、一例として図２に示すように、磁気テープＴに記録するデータを取り扱う単位として、文書データ及び画像データ等のユーザが保存対象とするデータと、そのデータに関するメタデータとを含むオブジェクトを適用した形態例を説明する。図２の例では、メタデータを「メタ」と表記している。なお、このオブジェクトを取り扱うストレージシステムは、オブジェクトストレージシステムと称される。メタデータには、例えば、オブジェクトキー等のオブジェクトの識別情報、オブジェクト名、データのサイズ、及びタイムスタンプ等の属性情報が含まれる。なお、オブジェクトを磁気テープＴに記録する際のデータ及びメタデータの記録順は特に限定されず、メタデータ及びデータの順でもよいし、データ及びメタデータの順でもよい。 In this embodiment, as an example, as shown in FIG. 2, a unit handling data to be recorded on the magnetic tape T includes data to be stored by the user, such as document data and image data, and metadata related to the data. A form example to which an object is applied will be described. In the example of FIG. 2, the metadata is written as "meta". A storage system that handles this object is called an object storage system. The metadata includes, for example, object identification information such as object keys, object names, data sizes, and attribute information such as time stamps. The recording order of the data and the metadata when recording the object on the magnetic tape T is not particularly limited, and may be the order of the metadata and the data, or the order of the data and the metadata.
　次に、図３を参照して、本実施形態に係る磁気テープＴの構成を説明する。図３に示すように、磁気テープＴは、フォーマットされる際に、メタデータが記録されるリファレンスパーティションＲＰと、オブジェクトが記録されるデータパーティションＤＰとの２つのパーティションに分割される。データパーティションＤＰが、オブジェクトが記録される第１のパーティションの一例であり、リファレンスパーティションＲＰが、メタデータが記録される第２のパーティションの一例である。なお、データパーティションＤＰに記録されるオブジェクトには、データ及びメタデータのうち、データのみが含まれるオブジェクトが存在してもよいし、メタデータのみが含まれるオブジェクトが存在してもよい。 Next, the configuration of the magnetic tape T according to this embodiment will be described with reference to FIG. As shown in FIG. 3, when the magnetic tape T is formatted, it is divided into two partitions, a reference partition RP in which metadata is recorded and a data partition DP in which objects are recorded. The data partition DP is an example of a first partition in which objects are recorded, and the reference partition RP is an example of a second partition in which metadata is recorded. Among the objects recorded in the data partition DP, there may be objects containing only data, or objects containing only metadata.
　次に、図４を参照して、本実施形態に係る情報処理装置１２のハードウェア構成を説明する。図４に示すように、情報処理装置１２は、ＣＰＵ（Central Processing Unit）２０、一時記憶領域としてのメモリ２１、及び不揮発性の記憶部２２を含む。また、情報処理装置１２は、液晶ディスプレイ等のディスプレイ２３、キーボードとマウス等の入力装置２４、ネットワークに接続されるネットワークＩ／Ｆ（InterFace）２５、及び各テープドライブ１８が接続される外部Ｉ／Ｆ２６を含む。ＣＰＵ２０、メモリ２１、記憶部２２、ディスプレイ２３、入力装置２４、ネットワークＩ／Ｆ２５、及び外部Ｉ／Ｆ２６は、バス２７に接続される。 Next, the hardware configuration of the information processing device 12 according to this embodiment will be described with reference to FIG. As shown in FIG. 4, the information processing device 12 includes a CPU (Central Processing Unit) 20, a memory 21 as a temporary storage area, and a non-volatile storage section 22. FIG. The information processing device 12 also includes a display 23 such as a liquid crystal display, an input device 24 such as a keyboard and a mouse, a network I/F (InterFace) 25 connected to a network, and an external I/F to which each tape drive 18 is connected. Including F26. CPU 20 , memory 21 , storage unit 22 , display 23 , input device 24 , network I/F 25 and external I/F 26 are connected to bus 27 .
　記憶部２２は、ＨＤＤ（Hard Disk Drive）、ＳＳＤ（Solid State Drive）、又はフラッシュメモリ等によって実現される。記憶媒体としての記憶部２２には、情報処理プログラム３０が記憶される。ＣＰＵ２０は、記憶部２２から情報処理プログラム３０を読み出してからメモリ２１に展開し、展開した情報処理プログラム３０を実行する。 The storage unit 22 is implemented by a HDD (Hard Disk Drive), SSD (Solid State Drive), flash memory, or the like. An information processing program 30 is stored in the storage unit 22 as a storage medium. The CPU 20 reads out the information processing program 30 from the storage unit 22 , expands it in the memory 21 , and executes the expanded information processing program 30 .
　ところで、本実施形態に係る情報処理システム１０では、複数の移行元の磁気テープＴから複数の移行先の磁気テープＴにデータ移行が行われる。以下では、移行元の磁気テープＴと移行先の磁気テープＴとを区別する場合は、移行元の磁気テープＴを「磁気テープＴ１」といい、移行先の磁気テープＴを「磁気テープＴ２」という。磁気テープＴ１及び磁気テープＴ２ともに、テープライブラリ１４のスロットに格納される。磁気テープＴ１には、移行対象のデータが記録されている。磁気テープＴ２は、データが記録されていない新たな磁気テープＴである。 By the way, in the information processing system 10 according to the present embodiment, data is migrated from a plurality of source magnetic tapes T to a plurality of destination magnetic tapes T. FIG. Hereinafter, when distinguishing between the source magnetic tape T and the destination magnetic tape T, the source magnetic tape T will be referred to as "magnetic tape T1" and the destination magnetic tape T will be referred to as "magnetic tape T2". It says. Both the magnetic tape T1 and the magnetic tape T2 are stored in slots of the tape library 14. FIG. Data to be transferred is recorded on the magnetic tape T1. The magnetic tape T2 is a new magnetic tape T on which no data is recorded.
　データ移行の目的として、例えば、論理的に削除されたデータのサイズの合計値が一定値以上になった磁気テープＴ１の空き容量を増やすことが挙げられる。また、データ移行の目的として、例えば、旧世代の磁気テープＴ１に記録されたデータを新世代の磁気テープＴ２に移行すること、及び経年劣化に伴いエラーレートが高くなった磁気テープＴ１に記録されたデータを新たな磁気テープＴ２に移行すること等も挙げられる。 The purpose of data migration is, for example, to increase the free space of magnetic tape T1 where the total size of logically deleted data has reached a certain value or more. Further, as a purpose of data migration, for example, data recorded on the old-generation magnetic tape T1 is migrated to the new-generation magnetic tape T2, and data recorded on the magnetic tape T1 whose error rate has increased due to deterioration over time. Another example is to migrate the data that has been recorded to a new magnetic tape T2.
　なお、複数の磁気テープＴ１に記録されたデータの総サイズが１本の磁気テープＴ２に記録可能なサイズである場合は、磁気テープＴ２の本数は磁気テープＴ１の本数よりも少なくてもよい。本実施形態では、各磁気テープＴ１には、その磁気テープＴ１に記録されたデータの総サイズ及び磁気テープＴ２に記録可能なデータサイズに基づいて、移行先の磁気テープＴ２が予め対応付けられている。 If the total size of data recorded on multiple magnetic tapes T1 is a size that can be recorded on one magnetic tape T2, the number of magnetic tapes T2 may be less than the number of magnetic tapes T1. In this embodiment, each magnetic tape T1 is associated in advance with the destination magnetic tape T2 based on the total size of data recorded on the magnetic tape T1 and the size of data recordable on the magnetic tape T2. there is
　一般的に、データのサイズはデータによって様々であるが、メタデータのサイズはデータによらず、データのサイズに比べれば変動が小さい。従って、一例として図５に示すように、比較的小さいサイズのデータを含むオブジェクト及びそのデータに関するメタデータが多く記録されている磁気テープＴでは、以下の状態になってしまう場合がある。すなわち、このような磁気テープＴでは、データパーティションＤＰにはまだ空きがあるのに、リファレンスパーティションＲＰに空きがなく、磁気テープＴに新たなオブジェクトを記録できなくなってしまう場合がある。 In general, the size of data varies depending on the data, but the size of metadata does not depend on the data and fluctuates less than the size of the data. Therefore, as shown in FIG. 5 as an example, a magnetic tape T on which a lot of objects including data of relatively small size and metadata related to the data are recorded may be in the following state. That is, in such a magnetic tape T, there is a case where the data partition DP still has space, but the reference partition RP has no space, and a new object cannot be recorded on the magnetic tape T.
　一方、一例として図６に示すように、比較的大きいサイズのデータを含むオブジェクト及びそのデータに関するメタデータが多く記録されている磁気テープＴでは、以下の状態になってしまう場合がある。すなわち、このような磁気テープＴでは、リファレンスパーティションＲＰにはまだ空きがあるのに、データパーティションＤＰに空きがなく、磁気テープＴに新たなオブジェクトを記録できなくなってしまう場合がある。 On the other hand, as shown in FIG. 6 as an example, in a magnetic tape T on which a lot of objects including data of relatively large size and metadata related to the data are recorded, the following state may occur. In other words, with such a magnetic tape T, there are cases where there is no space in the data partition DP even though there is still space in the reference partition RP, and a new object cannot be recorded on the magnetic tape T.
　これらの場合、磁気テープＴ１に記録されたメタデータ群及びオブジェクト群をそのまま磁気テープＴ２を記録すると、効率的ではない。そこで、本実施形態に係る情報処理装置１２は、磁気テープＴ１に記録されたオブジェクト群のトータルサイズとメタデータ群のトータルサイズとの比に基づいて、磁気テープＴ１からデータを移行する機能を有する。 In these cases, it is not efficient to record the metadata group and object group recorded on the magnetic tape T1 as they are on the magnetic tape T2. Therefore, the information processing apparatus 12 according to the present embodiment has a function of migrating data from the magnetic tape T1 based on the ratio between the total size of the object group recorded on the magnetic tape T1 and the total size of the metadata group. .
　次に、図７を参照して、本実施形態に係る情報処理装置１２の機能的な構成について説明する。図７に示すように、情報処理装置１２は、判定部４０、第１制御部４２、第２制御部４４、第３制御部４６、及び第４制御部４８を含む。ＣＰＵ２０が情報処理プログラム３０を実行することにより、判定部４０、第１制御部４２、第２制御部４４、第３制御部４６、及び第４制御部４８として機能する。 Next, with reference to FIG. 7, the functional configuration of the information processing device 12 according to this embodiment will be described. As shown in FIG. 7 , the information processing device 12 includes a determination section 40 , a first control section 42 , a second control section 44 , a third control section 46 and a fourth control section 48 . By executing the information processing program 30 , the CPU 20 functions as a determination section 40 , a first control section 42 , a second control section 44 , a third control section 46 and a fourth control section 48 .
　判定部４０は、複数の磁気テープＴ１それぞれについて、データパーティションＤＰに記録されたオブジェクト群のトータルサイズと、リファレンスパーティションＲＰに記録されたメタデータ群のトータルサイズとの比Ｈ１が一定の範囲内であるか又は範囲外であるかを判定する。この一定の範囲としては、例えば、磁気テープＴ２のデータパーティションＤＰのサイズとリファレンスパーティションＲＰのサイズとの比Ｈ２を中心とした一定の範囲が挙げられる。具体的な一例として、比Ｈ２が「９６：４」の場合、一定の範囲として「９５．８：４．２」から「９６．２：３．８」までが挙げられる。ここでいうデータパーティションＤＰに記録されたオブジェクト群とは、データパーティションＤＰに記録された全てのオブジェクトを意味する。また、ここでいうリファレンスパーティションＲＰに記録されたメタデータ群とは、リファレンスパーティションＲＰに記録された全てのメタデータを意味する。また、データパーティションＤＰのサイズとは、データパーティションＤＰに記録可能なデータサイズの上限値を意味する。また、リファレンスパーティションＲＰのサイズとは、リファレンスパーティションＲＰに記録可能なデータサイズの上限値を意味する。 The determination unit 40 determines whether the ratio H1 between the total size of the object group recorded in the data partition DP and the total size of the metadata group recorded in the reference partition RP is within a certain range for each of the plurality of magnetic tapes T1. or out of range. This fixed range is, for example, a fixed range around the ratio H2 between the size of the data partition DP and the size of the reference partition RP of the magnetic tape T2. As a specific example, when the ratio H2 is "96:4", the fixed range is from "95.8:4.2" to "96.2:3.8". The object group recorded in the data partition DP here means all the objects recorded in the data partition DP. Also, the metadata group recorded in the reference partition RP here means all the metadata recorded in the reference partition RP. Also, the size of the data partition DP means the upper limit of the data size recordable in the data partition DP. Also, the size of the reference partition RP means the upper limit of the data size recordable in the reference partition RP.
　また、判定部４０には、移行対象の全ての磁気テープＴ１の中に、比Ｈ１が一定の範囲外である磁気テープＴ１が複数存在するか否かを判定する。 In addition, the determination unit 40 determines whether or not there are a plurality of magnetic tapes T1 whose ratio H1 is outside a certain range among all the magnetic tapes T1 to be transferred.
　第１制御部４２は、判定部４０により比Ｈ１が一定の範囲外である磁気テープＴ１が複数存在すると判定された場合、その複数の磁気テープＴ１からメタデータ群及びオブジェクト群を読み取る制御（以下、「第１の制御」という）を行う。この第１の制御において、第１制御部４２は、複数のテープドライブ１８を用いて複数の磁気テープＴ１からメタデータ群及びオブジェクト群を並列に読み取る制御を行う。 When the determination unit 40 determines that there are a plurality of magnetic tapes T1 whose ratio H1 is outside a certain range, the first control unit 42 controls reading of the metadata group and the object group from the plurality of magnetic tapes T1 (hereinafter referred to as , referred to as “first control”). In this first control, the first control unit 42 controls parallel reading of metadata groups and object groups from a plurality of magnetic tapes T1 using a plurality of tape drives 18 .
　第２制御部４４は、第１制御部４２による第１の制御によって得られたメタデータ群を磁気テープＴ２のリファレンスパーティションＲＰに記録し、かつ第１の制御によって得られたオブジェクト群を磁気テープＴ２のデータパーティションＤＰに記録する制御（以下、「第２の制御」という）を行う。この第２の制御において、第２制御部４４は、複数のテープドライブ１８を用いて複数の磁気テープＴ２にメタデータ群及びオブジェクト群を並列に記録する制御を行う。また、この第２の制御において、第２制御部４４は、複数の磁気テープＴ２での比Ｈ１が平準化されるように、第１の制御によって得られたメタデータ群及びオブジェクト群を複数の磁気テープＴ２に記録する制御を行う。 The second control unit 44 records the metadata group obtained by the first control by the first control unit 42 on the reference partition RP of the magnetic tape T2, and records the object group obtained by the first control on the magnetic tape. Control for recording in the data partition DP of T2 (hereinafter referred to as "second control") is performed. In this second control, the second control unit 44 controls parallel recording of a metadata group and an object group on a plurality of magnetic tapes T2 using a plurality of tape drives 18 . Also, in this second control, the second control unit 44 divides the metadata group and the object group obtained by the first control into a plurality of It controls recording on the magnetic tape T2.
　第３制御部４６は、判定部４０により比Ｈ１が一定の範囲内であると判定された磁気テープＴ１については、１つのテープドライブ１８を用いて、磁気テープＴ１からメタデータ群及びオブジェクト群を読み取る制御（以下、「第３の制御」という）を行う。また、第３制御部４６は、判定部４０により比Ｈ１が一定の範囲外である磁気テープＴ１が１本存在すると判定された場合、その１本の磁気テープＴ１についても第３の制御を行う。 The third control unit 46 uses one tape drive 18 to extract the metadata group and the object group from the magnetic tape T1 for which the determination unit 40 has determined that the ratio H1 is within a certain range. Read control (hereinafter referred to as “third control”) is performed. Further, when the determination unit 40 determines that there is one magnetic tape T1 whose ratio H1 is outside the predetermined range, the third control unit 46 also performs the third control for that one magnetic tape T1. .
　第４制御部４８は、第３制御部４６による第３の制御によって得られたメタデータ群を磁気テープＴ２のリファレンスパーティションＲＰに記録し、かつ第３の制御によって得られたオブジェクト群を磁気テープＴ２のデータパーティションＤＰに記録する制御（以下、「第４の制御」という）を行う。 The fourth control unit 48 records the metadata group obtained by the third control by the third control unit 46 on the reference partition RP of the magnetic tape T2, and records the object group obtained by the third control on the magnetic tape. Control for recording in the data partition DP of T2 (hereinafter referred to as "fourth control") is performed.
　図８及び図９を参照して、第１の制御、第２の制御、第３の制御、及び第４の制御の具体例を説明する。図８及び図９に示すように、ここでは、移行元の磁気テープＴ１及び移行先の磁気テープＴ２がそれぞれ３本あるものとする。また、３本の磁気テープＴ１それぞれの比Ｈ１が「９３：７」、「９９：１」、及び「９６：４」であり、３本の磁気テープＴ２の比Ｈ２が何れも「９６：４」であり、上記一定の範囲が「９５．８：４．２」から「９６．２：３．８」であるものとする。 Specific examples of the first control, second control, third control, and fourth control will be described with reference to FIGS. As shown in FIGS. 8 and 9, it is assumed here that there are three source magnetic tapes T1 and three target magnetic tapes T2. Further, the ratios H1 of the three magnetic tapes T1 are "93:7", "99:1" and "96:4", and the ratio H2 of the three magnetic tapes T2 are all "96:4". and the certain range is from "95.8:4.2" to "96.2:3.8".
　この場合、判定部４０により比Ｈ１が一定の範囲外である磁気テープＴ１が複数存在すると判定される。従って、図８に示すように、比Ｈ１が一定の範囲外である２本の磁気テープに対して第１の制御及び第２の制御が行われる。この際、前述したように、複数の磁気テープＴ２での比Ｈ１が平準化されるように第２の制御が行われる。この結果、２本の磁気テープＴ２では、比Ｈ１が「９６（＝（９３＋９９）÷２）：４（＝（７＋１）÷２）」に極力近づくことになる。 In this case, the determination unit 40 determines that there are a plurality of magnetic tapes T1 whose ratio H1 is out of a certain range. Therefore, as shown in FIG. 8, the first control and the second control are performed on two magnetic tapes whose ratio H1 is outside the predetermined range. At this time, as described above, the second control is performed so that the ratio H1 of the plurality of magnetic tapes T2 is leveled. As a result, in the two magnetic tapes T2, the ratio H1 approaches "96 (=(93+99)/2):4 (=(7+1)/2)" as much as possible.
　一方、図９に示すように、比Ｈ１が一定の範囲内である磁気テープＴ１に対しては第３の制御及び第４の制御が行われる。従って、この場合、磁気テープＴ２においても比Ｈ１は比Ｈ２を中心とした一定の範囲内となる。 On the other hand, as shown in FIG. 9, the third control and the fourth control are performed for the magnetic tape T1 whose ratio H1 is within a certain range. Therefore, in this case, the ratio H1 is also within a certain range around the ratio H2 in the magnetic tape T2.
　次に、図１０を参照して、本実施形態に係る情報処理装置１２の作用を説明する。ＣＰＵ２０が情報処理プログラム３０を実行することによって、図１０に示すデータ移行処理が実行される。図１０に示すデータ移行処理は、例えば、ユーザにより実行指示が入力された場合に実行される。また、この際、例えば、移行対象の磁気テープＴ１の識別情報がユーザにより入力される。 Next, the operation of the information processing device 12 according to this embodiment will be described with reference to FIG. The data migration process shown in FIG. 10 is executed by the CPU 20 executing the information processing program 30 . The data migration process shown in FIG. 10 is executed, for example, when an execution instruction is input by the user. At this time, for example, the user inputs the identification information of the magnetic tape T1 to be transferred.
　図１０のステップＳ１０で、判定部４０は、前述したように、移行対象の複数の磁気テープＴ１それぞれについて、比Ｈ１が一定の範囲内であるか又は範囲外であるかを判定する。判定部４０により比Ｈ１が一定の範囲外であると判定された磁気テープＴ１については、処理がステップＳ１２に移行し、比Ｈ１が一定の範囲内であると判定された磁気テープＴ１については、処理がステップＳ１８に移行する。 In step S10 of FIG. 10, the determination unit 40 determines whether the ratio H1 is within a certain range or out of the range for each of the plurality of magnetic tapes T1 to be transferred, as described above. For the magnetic tape T1 whose ratio H1 is determined to be outside the predetermined range by the determining unit 40, the process proceeds to step S12, and for the magnetic tape T1 whose ratio H1 is determined to be within the predetermined range, The process moves to step S18.
　ステップＳ１２で、判定部４０は、前述したように、ステップＳ１０で比Ｈ１が一定の範囲外であると判定された磁気テープＴ１が複数存在するか否かを判定する。この判定が肯定判定となった場合は、処理はステップＳ１４に移行し、否定判定となった場合は、処理はステップＳ１８に移行する。すなわち、比Ｈ１が一定の範囲外である磁気テープＴ１が複数存在する場合は、その複数の磁気テープＴ１に対してステップＳ１４及びステップＳ１６の処理が実行される。また、比Ｈ１が一定の範囲外である磁気テープＴ１が１本存在する場合は、その１本の磁気テープＴ１に対してステップＳ１８及びステップＳ２０の処理が実行される。また、比Ｈ１が一定の範囲内であると判定された磁気テープＴ１それぞれに対してもステップＳ１８及びステップＳ２０の処理が実行される。 In step S12, as described above, the determination unit 40 determines whether or not there are a plurality of magnetic tapes T1 for which the ratio H1 was determined to be outside the certain range in step S10. If this determination is affirmative, the process proceeds to step S14, and if it is negative, the process proceeds to step S18. In other words, when there are multiple magnetic tapes T1 whose ratio H1 is outside a certain range, the processes of steps S14 and S16 are executed for the multiple magnetic tapes T1. Also, if there is one magnetic tape T1 whose ratio H1 is outside the predetermined range, the processing of steps S18 and S20 is executed for that one magnetic tape T1. The processing of steps S18 and S20 is also executed for each magnetic tape T1 for which the ratio H1 is determined to be within a certain range.
　ステップＳ１４で、第１制御部４２は、前述したように、比Ｈ１が一定の範囲内であると判定された複数の磁気テープＴ１に対して第１の制御を行う。ステップＳ１６で、第２制御部４４は、前述したように、ステップＳ１４の第１の制御によって得られたメタデータ群及びオブジェクト群を用いて第２の制御を行う。ステップＳ１６の処理が終了するとデータ移行処理が終了する。 At step S14, the first control unit 42 performs the first control on the plurality of magnetic tapes T1 for which the ratio H1 is determined to be within a certain range, as described above. In step S16, the second control unit 44 performs second control using the metadata group and object group obtained by the first control in step S14, as described above. When the process of step S16 ends, the data migration process ends.
　一方、ステップＳ１８で、第３制御部４６は、前述したように、磁気テープＴ１に対して第３の制御を行う。ステップＳ２０で、第４制御部４８は、前述したように、ステップＳ１８の第３の制御によって得られたメタデータ群及びオブジェクト群を用いて第４の制御を行う。ステップＳ２０の処理が終了するとデータ移行処理が終了する。 On the other hand, in step S18, the third control unit 46 performs the third control on the magnetic tape T1 as described above. In step S20, the fourth control unit 48 performs fourth control using the metadata group and object group obtained by the third control in step S18, as described above. When the process of step S20 ends, the data migration process ends.
　以上説明したように、本実施形態によれば、移行先の磁気テープＴ２において、比Ｈ１が比Ｈ２を中心とした一定の範囲内となるか、又は磁気テープＴ１に比較して比Ｈ１が比Ｈ２に近くなる。従って、磁気テープＴ１のデータ移行を効率的に行うことができる。 As described above, according to the present embodiment, in the magnetic tape T2 of the transfer destination, the ratio H1 is within a certain range centered on the ratio H2, or the ratio H1 is within the ratio H1 compared to the magnetic tape T1. close to H2. Therefore, the data migration of the magnetic tape T1 can be efficiently performed.
　なお、上記実施形態において、複数のテープドライブ１８のうちの使用されているテープドライブ１８の割合を示す使用率Ｓが予め定められた閾値ＴＨ未満の場合に、第１制御部４２が第１の制御を行い、かつ第２制御部４４が第２の制御を行ってもよい。また、使用率Ｓが閾値ＴＨ以上の場合に、第３制御部４６が第３の制御を行い、かつ第４制御部４８が第４の制御を行ってもよい。この複数のテープドライブ１８は、テープライブラリ１４が備える全てのテープドライブ１８でもよいし、テープライブラリ１４が備える全てのテープドライブ１８のうち、データ移行用として割り当てられている一部のテープドライブ１８でもよい。 In the above embodiment, when the usage rate S indicating the ratio of the tape drives 18 in use among the plurality of tape drives 18 is less than the predetermined threshold value TH, the first control unit 42 The control may be performed, and the second control section 44 may perform the second control. Further, when the usage rate S is equal to or higher than the threshold TH, the third control section 46 may perform the third control and the fourth control section 48 may perform the fourth control. The plurality of tape drives 18 may be all the tape drives 18 provided in the tape library 14, or some of the tape drives 18 assigned for data migration among all the tape drives 18 provided in the tape library 14. good.
　また、上記実施形態において、予め定められた期間ＴＭ（例えば、１日）内における使用率Ｓが相対的に低い時間帯に第１制御部４２が第１の制御を行い、かつ第２制御部４４が第２の制御を行ってもよい。また、期間ＴＭ内における使用率Ｓが相対的に高い時間帯に、第３制御部４６が第３の制御を行い、かつ第４制御部４８が第４の制御を行ってもよい。これらの例における使用率Ｓは、例えば、直前の使用率を用いてもよいし、過去の同じ時間帯の使用率の実績値を用いてもよい。 Further, in the above embodiment, the first control unit 42 performs the first control and the second control unit 44 may perform the second control. Also, the third control unit 46 may perform the third control and the fourth control unit 48 may perform the fourth control during a time period in which the usage rate S is relatively high within the period TM. For the usage rate S in these examples, for example, the usage rate immediately before may be used, or the actual value of the usage rate in the same time period in the past may be used.
　また、上記実施形態において、一例として図１１に示すように、第２制御部４４は、移行先の複数の磁気テープＴ２にデータを多重化して記録する制御を行う場合、その複数の一部の少なくとも１本の磁気テープＴ２に対して第２の制御を行ってもよい。この場合、第２制御部４４は、残りの磁気テープＴ２に対しては、その少なくとも１本の磁気テープＴ２からデータを複製して記録する制御を行う。図１１では、３本の磁気テープＴ２に同じデータを多重化して記録する場合に、まず、１本の磁気テープＴ２にデータを記録し、次に、その１本の磁気テープＴ２から残りの２本の磁気テープＴ２にデータを複製する例を示している。 Further, in the above embodiment, as shown in FIG. 11 as an example, the second control unit 44 performs control to multiplex and record data on a plurality of magnetic tapes T2 of the migration destination. The second control may be performed on at least one magnetic tape T2. In this case, the second control unit 44 performs control to duplicate and record data from at least one magnetic tape T2 on the remaining magnetic tapes T2. In FIG. 11, when the same data is multiplexed and recorded on three magnetic tapes T2, the data is first recorded on one magnetic tape T2, and then the data is recorded on the remaining two magnetic tapes T2 from that one magnetic tape T2. An example of duplicating data on the magnetic tape T2 of a book is shown.
　また、上記実施形態において、例えば、判定部４０、第１制御部４２、第２制御部４４、第３制御部４６、及び第４制御部４８といった各種の処理を実行する処理部（processing unit）のハードウェア的な構造としては、次に示す各種のプロセッサ（processor）を用いることができる。上記各種のプロセッサには、前述したように、ソフトウェア（プログラム）を実行して各種の処理部として機能する汎用的なプロセッサであるＣＰＵに加えて、ＦＰＧＡ（Field Programmable Gate Array）等の製造後に回路構成を変更可能なプロセッサであるプログラマブルロジックデバイス（Programmable Logic Device：PLD）、ＡＳＩＣ（Application Specific Integrated Circuit）等の特定の処理を実行させるために専用に設計された回路構成を有するプロセッサである専用電気回路等が含まれる。 Further, in the above embodiment, for example, a processing unit that executes various processes such as the determination unit 40, the first control unit 42, the second control unit 44, the third control unit 46, and the fourth control unit 48 Various processors shown below can be used as the hardware structure of . As described above, the various processors include, in addition to the CPU, which is a general-purpose processor that executes software (programs) and functions as various processing units, circuits such as FPGAs (Field Programmable Gate Arrays), etc. Programmable Logic Device (PLD) which is a processor whose configuration can be changed, ASIC (Application Specific Integrated Circuit) etc. Circuits, etc. are included.
　１つの処理部は、これらの各種のプロセッサのうちの１つで構成されてもよいし、同種又は異種の２つ以上のプロセッサの組み合わせ（例えば、複数のＦＰＧＡの組み合わせや、ＣＰＵとＦＰＧＡとの組み合わせ）で構成されてもよい。また、複数の処理部を１つのプロセッサで構成してもよい。 One processing unit may be composed of one of these various processors, or a combination of two or more processors of the same type or different types (for example, a combination of multiple FPGAs, a combination of a CPU and an FPGA). combination). Also, a plurality of processing units may be configured by one processor.
　複数の処理部を１つのプロセッサで構成する例としては、第１に、クライアント及びサーバ等のコンピュータに代表されるように、１つ以上のＣＰＵとソフトウェアの組み合わせで１つのプロセッサを構成し、このプロセッサが複数の処理部として機能する形態がある。第２に、システムオンチップ（System on Chip：SoC）等に代表されるように、複数の処理部を含むシステム全体の機能を１つのＩＣ（Integrated Circuit）チップで実現するプロセッサを使用する形態がある。このように、各種の処理部は、ハードウェア的な構造として、上記各種のプロセッサの１つ以上を用いて構成される。 As an example of configuring a plurality of processing units with a single processor, first, as represented by computers such as clients and servers, a single processor is configured by combining one or more CPUs and software. There is a form in which a processor functions as multiple processing units. Second, as typified by System on Chip (SoC), etc., there is a form of using a processor that realizes the functions of the entire system including multiple processing units with a single IC (Integrated Circuit) chip. be. In this way, the various processing units are configured using one or more of the above various processors as a hardware structure.
　更に、これらの各種のプロセッサのハードウェア的な構造としては、より具体的には、半導体素子などの回路素子を組み合わせた電気回路（circuitry）を用いることができる。 Furthermore, as the hardware structure of these various processors, more specifically, an electric circuit combining circuit elements such as semiconductor elements can be used.
　また、上記実施形態では、情報処理プログラム３０が記憶部２２に予め記憶（インストール）されている態様を説明したが、これに限定されない。情報処理プログラム３０は、ＣＤ－ＲＯＭ（Compact Disc Read Only Memory）、ＤＶＤ－ＲＯＭ（Digital Versatile Disc Read Only Memory）、及びＵＳＢ（Universal Serial Bus）メモリ等の記録媒体に記録された形態で提供されてもよい。また、情報処理プログラム３０は、ネットワークを介して外部装置からダウンロードされる形態としてもよい。 Also, in the above embodiment, the information processing program 30 has been pre-stored (installed) in the storage unit 22, but the present invention is not limited to this. The information processing program 30 is provided in a form recorded on a recording medium such as a CD-ROM (Compact Disc Read Only Memory), a DVD-ROM (Digital Versatile Disc Read Only Memory), and a USB (Universal Serial Bus) memory. good too. Further, the information processing program 30 may be downloaded from an external device via a network.
　２０２１年２月１５日に出願された日本国特許出願２０２１－０２１９５９号の開示は、その全体が参照により本明細書に取り込まれる。また、本明細書に記載された全ての文献、特許出願、及び技術規格は、個々の文献、特許出願、及び技術規格が参照により取り込まれることが具体的かつ個々に記された場合と同程度に、本明細書中に参照により取り込まれる。 The disclosure of Japanese Patent Application No. 2021-021959 filed on February 15, 2021 is incorporated herein by reference in its entirety. In addition, all publications, patent applications, and technical standards mentioned herein are to the same extent as if each individual publication, patent application, or technical standard were specifically and individually noted to be incorporated by reference. , incorporated herein by reference.

Claims (9)

  1. 　データ及び前記データに関するメタデータの少なくとも一方を含むオブジェクトであって、一つ以上のオブジェクトが記録される第１のパーティション及び前記メタデータが記録される第２のパーティションを有する磁気テープからデータを移行する制御を行う少なくとも一つのプロセッサを備える情報処理装置であって、
    　前記プロセッサは、
    　移行元の磁気テープに、前記第１のパーティションに記録されたオブジェクト群のトータルサイズと、前記第２のパーティションに記録されたメタデータ群のトータルサイズとの比が一定の範囲外である磁気テープが複数存在する場合、その複数の磁気テープからメタデータ群及びオブジェクト群を読み取る第１の制御を行い、
    　前記第１の制御によって得られたメタデータ群を移行先の磁気テープの前記第２のパーティションに記録し、かつ前記第１の制御によって得られたオブジェクト群を移行先の磁気テープの前記第１のパーティションに記録する第２の制御を行う
    　情報処理装置。     Migrate data from a magnetic tape having objects containing at least one of data and metadata about said data, said one or more objects being recorded in a first partition and said metadata being recorded in a second partition. An information processing device comprising at least one processor that performs control to
    The processor
    A magnetic tape whose ratio of the total size of the object group recorded in the first partition to the total size of the metadata group recorded in the second partition is outside a certain range on the migration source magnetic tape. If there are multiple, perform a first control to read the metadata group and the object group from the multiple magnetic tapes,
    The metadata group obtained by the first control is recorded in the second partition of the migration destination magnetic tape, and the object group obtained by the first control is recorded in the first partition of the migration destination magnetic tape. information processing device that performs a second control of recording in the partition of
  2. 　前記プロセッサは、
    　前記第１の制御において、複数のテープドライブを用いて前記複数の磁気テープからメタデータ群及びオブジェクト群を並列に読み取る制御を行う
    　請求項１に記載の情報処理装置。     The processor
    2. The information processing apparatus according to claim 1, wherein in said first control, a plurality of tape drives are used to read a metadata group and an object group from said plurality of magnetic tapes in parallel.
  3. 　前記プロセッサは、
    　前記第２の制御において、複数のテープドライブを用いて複数の前記移行先の磁気テープにメタデータ群及びオブジェクト群を並列に記録する制御を行う
    　請求項１又は請求項２に記載の情報処理装置。     The processor
    3. The information processing apparatus according to claim 1, wherein in the second control, the metadata group and the object group are recorded in parallel on a plurality of the migration destination magnetic tapes using a plurality of tape drives. .
  4. 　前記プロセッサは、
    　前記第２の制御において、複数の前記移行先の磁気テープの前記比が平準化されるように、前記第１の制御によって得られたメタデータ群及びオブジェクト群を複数の前記移行先の磁気テープに記録する制御を行う
    　請求項１から請求項３の何れか１項に記載の情報処理装置。     The processor
    In the second control, the metadata group and the object group obtained by the first control are transferred to a plurality of the migration destination magnetic tapes so that the ratio of the plurality of the migration destination magnetic tapes is leveled. 4. The information processing apparatus according to any one of claims 1 to 3, wherein the control is performed to record the data.
  5. 　前記プロセッサは、
    　複数のテープドライブのうちの使用されているテープドライブの割合を示す使用率が予め定められた閾値未満の場合、前記第１の制御及び前記第２の制御を行い、
    　前記使用率が前記閾値以上の場合、１つのテープドライブを用いて、前記比が前記一定の範囲内である磁気テープからメタデータ群及びオブジェクト群を読み取る第３の制御を行い、前記第３の制御によって得られたメタデータ群を移行先の磁気テープの前記第２のパーティションに記録し、かつ前記第３の制御によって得られたオブジェクト群を移行先の磁気テープの前記第１のパーティションに記録する第４の制御を行う
    　請求項１から請求項４の何れか１項に記載の情報処理装置。     The processor
    performing the first control and the second control when a usage rate indicating a percentage of tape drives in use among a plurality of tape drives is less than a predetermined threshold;
    when the usage rate is equal to or greater than the threshold value, a third control is performed to read the metadata group and the object group from the magnetic tape whose ratio is within the certain range using one tape drive; The metadata group obtained by the control is recorded in the second partition of the migration destination magnetic tape, and the object group obtained by the third control is recorded in the first partition of the migration destination magnetic tape. The information processing apparatus according to any one of claims 1 to 4, wherein a fourth control for performing the fourth control is performed.
  6. 　前記プロセッサは、
    　複数のテープドライブのうちの使用されているテープドライブの割合を示す使用率であって、予め定められた期間内におけるテープドライブの使用率が相対的に低い時間帯に前記第１の制御及び前記第２の制御を行い、
    　前記期間内における前記使用率が相対的に高い時間帯に１つのテープドライブを用いて、前記比が前記一定の範囲内である磁気テープからメタデータ群及びオブジェクト群を読み取る第３の制御を行い、前記第３の制御によって得られたメタデータ群を移行先の磁気テープの前記第２のパーティションに記録し、かつ前記第３の制御によって得られたオブジェクト群を移行先の磁気テープの前記第１のパーティションに記録する第４の制御を行う
    　請求項１から請求項４の何れか１項に記載の情報処理装置。     The processor
    A usage rate indicating a percentage of tape drives in use among a plurality of tape drives, wherein the first control and the perform a second control,
    performing a third control for reading a metadata group and an object group from a magnetic tape whose ratio is within the predetermined range, using one tape drive during a time zone in which the usage rate is relatively high within the period; recording the metadata group obtained by the third control on the second partition of the migration destination magnetic tape, and recording the object group obtained by the third control on the migration destination magnetic tape on the third partition; The information processing apparatus according to any one of claims 1 to 4, wherein a fourth control of recording in one partition is performed.
  7. 　前記プロセッサは、
    　移行先の複数の磁気テープにデータを多重化して記録する制御を行う場合、その複数の磁気テープの一部の少なくとも１本の磁気テープに対して前記第２の制御を行い、かつ残りのテープに対しては、その少なくとも１本の磁気テープからデータを複製して記録する制御を行う
    　請求項１から請求項６の何れか１項に記載の情報処理装置。     The processor
    When performing control to multiplex and record data on a plurality of magnetic tapes of the migration destination, the second control is performed on at least one magnetic tape of a portion of the plurality of magnetic tapes, and the remaining tapes are controlled. 7. The information processing apparatus according to any one of claims 1 to 6, wherein control is performed to duplicate and record data from at least one magnetic tape.
  8. 　データ及び前記データに関するメタデータの少なくとも一方を含むオブジェクトであって、一つ以上のオブジェクトが記録される第１のパーティション及び前記メタデータが記録される第２のパーティションを有する磁気テープからデータを移行する制御を行う少なくとも一つのプロセッサを備える情報処理装置の前記プロセッサが実行する情報処理方法であって、
    　移行元の磁気テープに、前記第１のパーティションに記録されたオブジェクト群のトータルサイズと、前記第２のパーティションに記録されたメタデータ群のトータルサイズとの比が一定の範囲外である磁気テープが複数存在する場合、その複数の磁気テープからメタデータ群及びオブジェクト群を読み取る第１の制御を行い、
    　前記第１の制御によって得られたメタデータ群を移行先の磁気テープの前記第２のパーティションに記録し、かつ前記第１の制御によって得られたオブジェクト群を移行先の磁気テープの前記第１のパーティションに記録する第２の制御を行う
    　情報処理方法。     Migrate data from a magnetic tape having objects containing at least one of data and metadata about said data, said one or more objects being recorded in a first partition and said metadata being recorded in a second partition. An information processing method executed by the processor of an information processing device comprising at least one processor that performs control to
    A magnetic tape whose ratio of the total size of the object group recorded in the first partition to the total size of the metadata group recorded in the second partition is outside a certain range on the migration source magnetic tape. If there are multiple, perform a first control to read the metadata group and the object group from the multiple magnetic tapes,
    The metadata group obtained by the first control is recorded in the second partition of the migration destination magnetic tape, and the object group obtained by the first control is recorded in the first partition of the migration destination magnetic tape. information processing method.
  9. 　データ及び前記データに関するメタデータの少なくとも一方を含むオブジェクトであって、一つ以上のオブジェクトが記録される第１のパーティション及び前記メタデータが記録される第２のパーティションを有する磁気テープからデータを移行する制御を行う少なくとも一つのプロセッサを備える情報処理装置の前記プロセッサに実行させるための情報処理プログラムであって、
    　移行元の磁気テープに、前記第１のパーティションに記録されたオブジェクト群のトータルサイズと、前記第２のパーティションに記録されたメタデータ群のトータルサイズとの比が一定の範囲外である磁気テープが複数存在する場合、その複数の磁気テープからメタデータ群及びオブジェクト群を読み取る第１の制御を行い、
    　前記第１の制御によって得られたメタデータ群を移行先の磁気テープの前記第２のパーティションに記録し、かつ前記第１の制御によって得られたオブジェクト群を移行先の磁気テープの前記第１のパーティションに記録する第２の制御を行う
    　情報処理プログラム。     Migrate data from a magnetic tape having objects containing at least one of data and metadata about said data, said one or more objects being recorded in a first partition and said metadata being recorded in a second partition. An information processing program for being executed by the processor of an information processing device comprising at least one processor that performs control to
    A magnetic tape whose ratio of the total size of the object group recorded in the first partition to the total size of the metadata group recorded in the second partition is outside a certain range on the migration source magnetic tape. If there are multiple, perform a first control to read the metadata group and the object group from the multiple magnetic tapes,
    The metadata group obtained by the first control is recorded in the second partition of the migration destination magnetic tape, and the object group obtained by the first control is recorded in the first partition of the migration destination magnetic tape. an information processing program that performs a second control of recording in a partition of
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