JP2023068981A - Information processing device, information processing method, and information processing program - Google Patents

Abstract

To provide an information processing device, information processing method, and information processing program, which allow for appropriately selecting a migration destination magnetic tape.SOLUTION: An information processing device provided herein comprises at least one processor configured to use an indicator value that is computed for each magnetic tape and correlates to an invalid data volume recorded on the magnetic tape to determine whether to prohibit data recording on the magnetic tape or not.SELECTED DRAWING: Figure 4

Description

The technology disclosed herein relates to an information processing device, an information processing method, and an information processing program.

The following techniques are known as techniques for restricting access to recording media. For example, Patent Literature 1 describes prohibiting write access to the physical volume to be ejected specified by the ejecting command when an ejecting command instructing outside management of the physical volume is received.

Also, the following techniques are known as techniques for transferring data between recording media. For example, Patent Literature 2 discloses a technique for detecting changes in the usage state of a storage area selected by the user computer from among the migration source storage area and the migration destination storage area over a predetermined period of time, and providing the result to the user computer via an interface. , it is described that the data migration plan is provided by the user.

JP 2012-221055 A JP 2014-139763 A

Data recorded on magnetic tape may contain invalid data that has been made inaccessible. Invalid data is, for example, data that has been logically deleted. A function of transferring valid data other than invalid data recorded on a magnetic tape to another magnetic tape and formatting the original magnetic tape to make it reusable is called reclamation. In general, a magnetic tape containing a large amount of invalid data is selected as the source magnetic tape for reclamation. Therefore, there is a high possibility that data newly recorded on a magnetic tape containing a large amount of invalid data will be transferred to another magnetic tape immediately after being recorded on that magnetic tape. That is, if a magnetic tape to be used as a data recording destination is determined without considering the presence of invalid data recorded on the magnetic tape, data migration may be repeated in a short period of time, which is inefficient.

The disclosed technique has been made in view of the above points, and aims to appropriately select a magnetic tape on which data is to be recorded.

An information processing device according to an embodiment of technology disclosed herein includes at least one processor. The processor determines whether or not to prohibit data recording on the magnetic tape based on the index value calculated for each magnetic tape and correlated with the amount of invalid data recorded on the magnetic tape. do.

The processor may determine that a magnetic tape whose index value is equal to or greater than a threshold value or a magnetic tape whose index value is relatively large should be prohibited from recording data.

The index value may be the ratio of the total size of invalid data to the capacity of the magnetic tape. The index value may be the ratio of the total size of invalid data to the total size of all data recorded on the magnetic tape. The index value may be the total size of invalid data recorded on the magnetic tape. The index value may be the ratio of the number of invalid data to the total number of data recorded on the magnetic tape.

When recording data on a magnetic tape, the processor may perform a process of recording the data on a magnetic tape other than the magnetic tape on which data recording is prohibited. When migrating data recorded on a magnetic tape to another magnetic tape, the processor may determine a magnetic tape other than the magnetic tape on which data recording is prohibited as the data migration destination magnetic tape. .

The information processing apparatus may include a database for managing a plurality of magnetic tapes, and in this case, the processor prohibits data recording on the magnetic tape determined to be prohibited from recording data in the database. A flag indicating what to do may be set.

The information processing method according to the disclosed technology is an index value calculated for each magnetic tape and based on the index value correlated with the amount of invalid data recorded on the magnetic tape, recording data on the magnetic tape. At least one processor included in the information processing apparatus executes the process of determining whether or not to prohibit.

The information processing program according to the disclosed technique performs data recording on a magnetic tape based on an index value that is calculated for each magnetic tape and correlates with the amount of invalid data recorded on the magnetic tape. A program for causing at least one processor included in an information processing apparatus to execute a process of determining whether or not to prohibit.

According to the disclosed technique, it is possible to appropriately select a magnetic tape as a data recording destination.

1 is a diagram showing an example of a configuration of a storage system according to an embodiment of technology disclosed herein; FIG. 1 is a diagram illustrating an example of a hardware configuration of an information processing device according to an embodiment of technology disclosed herein; FIG. FIG. 3 is a diagram showing an example of contents of management information according to an embodiment of technology disclosed herein; 1 is a functional block diagram showing an example of a functional configuration when an information processing apparatus according to an embodiment of technology disclosed herein records data on a magnetic tape; FIG. 4 is a diagram schematically showing recorded data on a magnetic tape having an index value V equal to or greater than a threshold value T according to an embodiment of the disclosed technology; FIG. FIG. 4 is a diagram schematically showing recorded data on a magnetic tape with an index value V less than a threshold value T according to an embodiment of the disclosed technique; 4 is a flowchart showing an example of the flow of data recording processing according to an embodiment of technology disclosed herein; FIG. 3 is a diagram showing an example of contents of management information according to an embodiment of technology disclosed herein; 4 is a flowchart showing an example of the flow of data recording processing according to an embodiment of technology disclosed herein;

An example of embodiments of the technology disclosed herein will be described below with reference to the drawings. In each drawing, the same or equivalent constituent elements and parts are given the same reference numerals, and overlapping descriptions are omitted as appropriate.

[First Embodiment]
FIG. 1 is a diagram showing an example of the configuration of a storage system 1 according to an embodiment of technology disclosed herein. The storage system 1 stores data requested to be stored by an external device (not shown) such as a user terminal connected to the storage system 1 via a network. Read the requested data and send it to the external device. The storage system 1 may be an object storage system that handles data in units of objects. An object includes a data body and metadata about the data body.

The storage system 1 includes an information processing device 10 and a tape library 20 . The tape library 20 has a plurality of slots (not shown) and a plurality of tape drives 40, each slot storing a magnetic tape 30. FIG. Data requested to be stored by an external device such as a user terminal is recorded on the magnetic tape 30 . The tape drive 40 records (writes) data on the magnetic tape 30 loaded in the tape drive 40 and reads data from the magnetic tape 30 based on instructions from the information processing apparatus 10 . An example of the magnetic tape 30 is an LTO (Linear Tape-Open) tape. When data is to be recorded on or read from the magnetic tape 30 , the target magnetic tape 30 is taken out of the slot and loaded into a predetermined tape drive 40 . When data recording or reading on the magnetic tape 30 loaded in the tape drive 40 is completed, the magnetic tape 30 is taken out from the tape drive 40 and stored in a predetermined slot. The information processing apparatus 10 controls data recording and reading on the magnetic tape 30 .

FIG. 2 is a diagram showing an example of the hardware configuration of the information processing device 10. As shown in FIG. The information processing apparatus 10 is connected to a CPU (Central Processing Unit) 101, a RAM (Random Access Memory) 102, a nonvolatile memory 103, a display device 104 such as a liquid crystal display, an input device 105 including a keyboard and a mouse, and a network. It includes a network interface 106 and an external interface 107 to which the tape drive 40 is connected. These hardware are connected to bus 108 .

The nonvolatile memory 103 is a nonvolatile storage medium such as an HDD (Hard Disk Drive), SSD (Solid State Drive), or flash memory. An information processing program 110 and management information 120 are stored in the nonvolatile memory 103 . A RAM 102 is a work memory for the CPU 101 to execute processing. The CPU 101 reads out the information processing program 110 from the nonvolatile memory 103, develops it in the RAM 102, and executes it. Note that an example of the information processing apparatus 10 is a server computer or the like. The CPU 101 is an example of a “processor” in technology disclosed herein.

FIG. 3 is a diagram showing an example of the contents of the management information 120. As shown in FIG. The management information 120 includes a tape ID (identification) that identifies the magnetic tape 30 stored in the tape library 20, a data ID that identifies data recorded on the magnetic tape 30, a size of each data, and is set for each data. This is a database in which invalid flags are associated with each other and recorded.

The invalid flag is information indicating whether the data is invalid data or valid data. The invalid data is, for example, data that has been logically deleted by inputting a deletion instruction by the user. In order to physically delete data from the magnetic tape 30, all the data recorded on the magnetic tape 30 are temporarily saved in another storage area, the magnetic tape 30 is initialized, and then saved. A process of recording data other than logically deleted data on the original magnetic tape 30 is required. Therefore, in order to physically delete data from the magnetic tape 30, the tape drive 40 will be occupied for a relatively long time. Therefore, in this embodiment, data for which a user has input a deletion instruction is logically deleted by storing a predetermined logical value in the invalid flag column of the management information 120 . In this embodiment, by storing "1" in the invalid flag column of the management information 120, the data is logically deleted and becomes inaccessible.

Also, the invalid data may include pre-update data that is no longer accessed by the user due to the update. The data updated by the user is not overwritten and stored on the magnetic tape, but the updated data is newly recorded on the magnetic tape. In this case, the data recorded on the magnetic tape before update is no longer accessed by the user. Invalid data may include both logically deleted data and pre-update data. On the other hand, valid data is data other than invalid data. In this embodiment, by storing "0" in the invalid flag string of the management information 120, the data is treated as valid data and made accessible.

FIG. 4 is a functional block diagram showing an example of a functional configuration when the information processing apparatus 10 records data on the magnetic tape 30. As shown in FIG. The information processing device 10 has a data acquisition section 11 , a tape selection section 12 , a determination section 13 and a data recording processing section 14 . By executing the information processing program 110 by the CPU 101 , the information processing apparatus 10 functions as a data acquisition section 11 , a tape selection section 12 , a determination section 13 and a data recording processing section 14 .

The data acquisition unit 11 acquires data to be recorded on the magnetic tape 30 (hereinafter referred to as data to be recorded). Data to be recorded may be, for example, data requested to be stored by the user. In this case, the data acquisition unit 11 acquires data transmitted from a user terminal connected via a network as data to be recorded. Further, for example, when performing data migration for the purpose of reclamation for the magnetic tapes 30 housed in the tape library 20, the data acquisition unit 11 detects the data recorded on the magnetic tapes 30 housed in the tape library 20. Data is acquired as data to be recorded to be recorded on another magnetic tape.

The tape selection unit 12 selects a magnetic tape 30 to be subjected to determination processing in the determination unit 13 (hereinafter referred to as a determination target magnetic tape) from among the magnetic tapes 30 stored in the tape library 20 . The tape selection unit 12 may select, for example, the magnetic tape 30 having a free space equal to or greater than a certain amount as the determination target magnetic tape.

The determination unit 13 calculates an index value V that correlates with the amount of invalid data recorded on the magnetic tape 30 for the determination target magnetic tape selected by the tape selection unit 12, and based on the calculated index value V For the magnetic tape 30, it is determined whether or not data recording is prohibited. The index value V is a value calculated for each magnetic tape 30 . The determination unit 13 refers to the management information 120 to obtain information about invalid data on the magnetic tape 30 and calculates the index value V1.

The index value V may be, for example, the ratio of the total value S of the sizes of invalid data to the capacity C of the magnetic tape 30 (determination target magnetic tape). That is, V=S/C may be satisfied. The index value V is the ratio of the total size S of invalid data to the total size M of all data (valid data and invalid data) recorded on the magnetic tape 30 (magnetic tape to be judged). good too. That is, V=S/M may be satisfied. Also, the index value V may be the total value S of the sizes of invalid data recorded on the magnetic tape 30 (determination target magnetic tape). That is, V=S may be satisfied. Alternatively, the index value V may be the ratio of the number N2 of invalid data to the number N1 of all data (valid data and invalid data) recorded on the magnetic tape. That is, V=N2/N1 may be satisfied.

The determination unit 13 determines that the magnetic tape 30 (determination target magnetic tape) whose index value V is equal to or greater than the threshold value T is prohibited from recording data. Further, the determination unit 13 determines that the magnetic tape 30 (determination target magnetic tape) whose index value V is less than the threshold value T is permitted to record data.

FIG. 5A is a diagram schematically showing recorded data on the magnetic tape 30A whose index value V is equal to or greater than the threshold value T. FIG. Recording of data in the empty area of the magnetic tape 30A shown in FIG. 5A is prohibited. On the other hand, FIG. 5B is a diagram schematically showing recorded data on the magnetic tape 30B in which the index value V is less than the threshold value T. As shown in FIG. Data recording in the free area of the magnetic tape 30B shown in FIG. 5B is permitted.

If a magnetic tape whose index value V is less than the threshold value T (that is, a magnetic tape on which data recording is permitted) does not exist in the tape library 20, the determination unit 13 adds a new magnetic tape to the tape library 20. You may request that For example, the determination unit 13 may cause the display device 104 to display a message prompting addition of a new magnetic tape to the tape library 20 .

The data recording processing unit 14 records the recording target data acquired by the data acquisition unit 11 on the magnetic tapes 30 other than the magnetic tapes for which data recording is prohibited by the determination unit 13 . For example, when data recorded on a magnetic tape is transferred to another magnetic tape for the purpose of reclamation, the data recording processing unit 14 transfers the data to a magnetic tape other than the magnetic tape for which data recording is prohibited. The destination magnetic tape is defined as the destination magnetic tape, and the data to be recorded is recorded on the destination magnetic tape.

The operation of the information processing apparatus 10 will be described below. FIG. 6 is a flowchart showing an example of the flow of data recording processing performed by CPU 101 executing information processing program 110 . The information processing program 110 is executed, for example, when a user inputs a process execution instruction via the input device 105 .

In step S1, the data acquisition unit 11 acquires data to be recorded. In step S2, the tape selection unit 12 selects one of the magnetic tapes 30 stored in the tape library 20 as a determination target magnetic tape. The tape selection unit 12 may select, for example, the magnetic tape 30 having a free space equal to or greater than a certain amount as the determination target magnetic tape.

In step S3, the determination unit 13 calculates the index value V for the determination target magnetic tape selected in step S2, and determines whether or not the calculated index value V is equal to or greater than a predetermined threshold value T. When determining that the index value V is equal to or greater than the threshold value T, the determining unit 13 determines that data recording on the magnetic tape 30 is prohibited. In this case, the process proceeds to step S5. On the other hand, when determining that the index value V is less than the threshold value T, the determination unit 13 determines that the magnetic tape 30 allows data recording. In this case, the process proceeds to step S4.

In step S4, the data recording processing unit 14 performs a process of recording the recording target data acquired in step S1 on the determination target magnetic tape selected in step S2.

In step S<b>5 , the determination unit 13 determines whether or not the determination in step S<b>3 has been completed for all the magnetic tapes 30 stored in the tape library 20 . If it is determined that the determination in step S3 has not been completed for all the magnetic tapes 30 stored in the tape library 20, the process proceeds to step S2. In this case, a magnetic tape 30 other than the previously selected magnetic tape 30 is selected as the determination target magnetic tape, and the determination process of step S3 is performed for that magnetic tape 30. FIG. On the other hand, if it is determined that the determination in step S3 has been completed for all the magnetic tapes 30 housed in the tape library 20, that is, if there is no magnetic tape permitting data recording in the tape library 20, the process is transferred to step S6.

In step S<b>6 , the determination unit 13 requests addition of a new magnetic tape 30 to the tape library 20 . For example, the determination unit 13 may cause the display device 104 to display a message prompting addition of a new magnetic tape to the tape library 20 .

As described above, the information processing apparatus 10 determines whether or not data on a magnetic tape is stored based on the index value V, which is an index value calculated for each magnetic tape and correlates with the amount of invalid data recorded on the magnetic tape. Determines whether or not to prohibit recording.

A function of transferring valid data other than invalid data recorded on a magnetic tape to another magnetic tape and formatting the original magnetic tape to make it reusable is called reclamation. In general, a magnetic tape containing a large amount of invalid data is selected as the source magnetic tape for reclamation. Therefore, there is a high possibility that data newly recorded on a magnetic tape containing a large amount of invalid data will be transferred to another magnetic tape immediately after being recorded on that magnetic tape. That is, if a magnetic tape to be used as a data recording destination is determined without considering the presence of invalid data recorded on the magnetic tape, data migration may be repeated in a short period of time, which is inefficient.

According to the information processing apparatus 10 according to the present embodiment, for each magnetic tape, whether or not data can be recorded on the magnetic tape is determined according to the amount of invalid data. Data recording can be suppressed. That is, according to the information processing apparatus 10 according to the present embodiment, it is possible to appropriately select the magnetic tape as the data recording destination. As a result, repeated data migration in a short period of time can be suppressed.

Note that the determination unit 13 may set a flag indicating that data recording should be prohibited for a magnetic tape determined to be prohibited from recording data. For example, as illustrated in FIG. 7, the management information 120 may be provided with a record prohibition flag string for setting a record prohibition flag for each magnetic tape. The determining unit 13 may prohibit recording of data on a magnetic tape on which recording of data is prohibited by storing "1" in the recording prohibition flag string. Further, the determination unit 13 may allow data recording on a magnetic tape that is permitted to be recorded by storing "0" in the write prohibition flag string. Thus, by setting a flag indicating that data recording should be prohibited for the magnetic tape determined to be prohibited from recording data, the index value V is calculated each time data is recorded. becomes unnecessary.

[Second embodiment]
In the above-described first embodiment, the case where the magnetic tape 30 whose index value V is equal to or greater than the threshold value is determined to be prohibited from recording data was exemplified, but the technology disclosed herein is not limited to this aspect. Of all or some of the plurality of magnetic tapes 30 accommodated in the tape library 20, the magnetic tape 30 having a relatively large index value V may be determined to be prohibited from recording data. In this case, the tape selector 12 becomes unnecessary.

FIG. 8 is a flow chart showing an example of the flow of data recording processing when it is determined that data recording on a magnetic tape with a relatively large index value V is prohibited.

In step S11, the data acquisition unit 11 acquires data to be recorded. In step S<b>12 , the determination unit 13 calculates an index value V for each of all or some of the plurality of magnetic tapes 30 accommodated in the tape library 20 . In step S13, the determination unit 13 determines that data recording on the magnetic tape 30 with a relatively large index value V calculated in step S12 is prohibited. For example, the determination unit 13 may perform the above determination so that the number of magnetic tapes 30 on which data recording is prohibited becomes a predetermined value. Further, the determination unit 13 performs the determination so that, for example, the ratio of the magnetic tapes 30 prohibited from recording data to all or part of the plurality of magnetic tapes 30 accommodated in the tape library 20 becomes a predetermined value. you can go In step S14, the data recording processing unit 14 performs a process of recording the data to be recorded obtained in step S11 on a magnetic tape other than the magnetic tape for which data recording is prohibited in step S13.

According to the information processing apparatus 10 according to the present embodiment, it is possible to appropriately select a magnetic tape as a data recording destination, as with the information processing apparatus 10 according to the first embodiment.

In each of the above embodiments, for example, the hardware structure of a processing unit (processing unit) that executes various processes such as the data acquisition unit 11, the tape selection unit 12, the determination unit 13, and the data recording processing unit 14 is as follows: Various processors can be used, as follows: 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, a processor such as an FPGA whose circuit configuration can be changed after manufacture. Programmable Logic Device (PLD), ASIC (Application Specific Integrated Circuit), etc. Includes a dedicated electric circuit that is a processor having a circuit configuration specially designed to execute specific processing.

One processing unit may be composed of one of these various processors, or a combination of two or more processors of the same or different type (for example, a combination of a plurality of FPGAs, or a combination of a CPU and an FPGA). combination). Also, a plurality of processing units may be configured by one processor.

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. Secondly, 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, various processing units are configured using one or more of the above various processors as a hardware structure.

Furthermore, as the hardware structure of these various processors, more specifically, an electric circuit in which circuit elements such as semiconductor elements are combined can be used.

Further, in the above-described embodiment, the information processing program 110 is stored (installed) in advance in the nonvolatile memory 103, but the present invention is not limited to this. The information processing program 110 is provided in a form recorded in 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 110 may be downloaded from an external device via a network.

1 storage system 10 information processing device 11 data acquisition unit 12 tape selection unit 13 judgment unit 14 data recording processing unit 20 tape libraries 30, 30A, 30B magnetic tape 40 tape drive 101 CPU
102 RAMs
103 non-volatile memory 104 display device 105 input device 106 network interface 107 external interface 108 bus 110 information processing program 120 management information

Claims (11)

An information processing device comprising at least one processor,
The processor
Determining whether to prohibit data recording on a magnetic tape based on an index value calculated for each magnetic tape and correlated with the amount of invalid data recorded on the magnetic tape Device. The processor
2. The information processing apparatus according to claim 1, wherein a magnetic tape whose index value is equal to or greater than a threshold value or a magnetic tape whose index value is relatively large is determined to be inhibited from recording data. 3. The information processing apparatus according to claim 1, wherein the index value is a ratio of a total size of invalid data to a capacity of the magnetic tape. 3. The information processing apparatus according to claim 1, wherein the index value is a ratio of the total size of invalid data to the total size of all data recorded on the magnetic tape. 3. The information processing apparatus according to claim 1, wherein said index value is a total value of sizes of invalid data recorded on a magnetic tape. 3. The information processing apparatus according to claim 1, wherein said index value is a ratio of the number of invalid data to the total number of data recorded on the magnetic tape. 7. The processor according to any one of claims 1 to 6, wherein when data is recorded on a magnetic tape, the processor performs a process of recording the data on a magnetic tape other than the magnetic tape on which data recording is prohibited. The information processing device according to . 3. When migrating data recorded on a magnetic tape to another magnetic tape, the processor determines a magnetic tape other than the magnetic tape on which data recording is prohibited as a data migration destination magnetic tape. The information processing apparatus according to any one of claims 1 to 7. Equipped with a database that manages multiple magnetic tapes,
9. The processor according to any one of claims 1 to 8, wherein the processor sets a flag indicating that data recording should be prohibited for a magnetic tape determined to be prohibited from recording data in the database. information processing equipment. Determining whether or not to prohibit data recording on a magnetic tape based on an index value calculated for each magnetic tape and correlated with the amount of invalid data recorded on the magnetic tape. and an information processing method executed by at least one processor included in an information processing device. Determining whether or not to prohibit data recording on a magnetic tape based on an index value calculated for each magnetic tape and correlated with the amount of invalid data recorded on the magnetic tape. , an information processing program to be executed by at least one processor included in an information processing device;

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