JP2023111328A - Information processing apparatus, information processing method, and information processing program - Google Patents

Abstract

To provide an information processing apparatus, an information processing method, and an information processing program, which can reduce the total size of a buffer memory when recording the same data on a plurality of magnetic tapes in parallel.SOLUTION: An information processing apparatus determines whether or not data stored in a buffer memory has been recorded on each of a plurality of magnetic tapes, and when determining that the data has been recorded on each of the plurality of magnetic tapes, stores data, which has not been stored on the plurality of magnetic tapes stored in a storage device, in an area where data determined to have been recorded in the buffer memory is stored.SELECTED DRAWING: Figure 8

Description

The present disclosure relates to an information processing device, an information processing method, and an information processing program.

Japanese Unexamined Patent Application Publication No. 2002-200002 discloses a technique in which a magnetic tape device that records data on magnetic tapes records the same data on a plurality of magnetic tapes using a buffer memory.

JP-A-2004-133845

When recording the same data in parallel on a plurality of magnetic tapes, if a buffer memory is prepared for each magnetic tape, the total size of the buffer memory will increase. The technique described in Patent Document 1 does not consider recording the same data in parallel on a plurality of magnetic tapes.

The present disclosure has been made in view of the above circumstances, and provides an information processing device, an information processing method, and an information processing device capable of reducing the total size of a buffer memory when recording the same data on a plurality of magnetic tapes in parallel. The purpose is to provide an information processing program.

An information processing apparatus according to the present disclosure is an information processing apparatus that includes at least one processor and controls recording of the same data on a plurality of magnetic tapes via a shared buffer memory, wherein the processor stores data in the buffer memory. If it is determined that the data has been recorded on each of the plurality of magnetic tapes, the data is not recorded on the plurality of magnetic tapes stored in the storage device. The data to be recorded is stored in the area in which the data determined to be recorded has been stored in the buffer memory.

Note that in the information processing apparatus of the present disclosure, the processor may perform control to record, in parallel, data that has not yet been recorded on the plurality of magnetic tapes stored in the buffer memory onto each of the plurality of magnetic tapes.

In addition, in the information processing apparatus of the present disclosure, in the control of parallel recording by the processor, if the difference between the addresses in the buffer memory of the data to be recorded next on each of the plurality of magnetic tapes is equal to or greater than a threshold value, relatively many The data recording process to the magnetic tape on which the data has already been recorded may be delayed.

Further, in the information processing apparatus of the present disclosure, the buffer memory may be of a ring buffer system.

Further, the information processing method of the present disclosure is an information processing method executed by a processor of an information processing apparatus that includes at least one processor and controls recording of the same data on a plurality of magnetic tapes via a shared buffer memory. determines whether or not the data stored in the buffer memory has been recorded on each of the plurality of magnetic tapes, and if it is determined that the data has been recorded on each of the plurality of magnetic tapes, the data is stored in the storage device. Data not yet recorded on a plurality of magnetic tapes is stored in an area of the buffer memory in which the data determined to have been recorded is stored.

Further, an information processing program of the present disclosure includes information processing for causing a processor of an information processing apparatus that includes at least one processor and performs control to record the same data on a plurality of magnetic tapes via a shared buffer memory. A program that determines whether data stored in a buffer memory has been recorded on each of a plurality of magnetic tapes, and if it is determined that data has been recorded on each of a plurality of magnetic tapes, Data that has not yet been recorded on a plurality of stored magnetic tapes is stored in an area of the buffer memory in which data that has been determined to have been recorded is stored.

According to the present disclosure, it is possible to reduce the total size of the buffer memory when recording the same data in parallel on a plurality of magnetic tapes.

1 is a block diagram showing an example of the configuration of an information processing system; FIG. FIG. 4 is a diagram for explaining that data is multiplexed and recorded on a plurality of magnetic tapes; It is a block diagram which shows an example of the hardware constitutions of an information processing apparatus. FIG. 4 is a diagram for explaining a buffer memory; FIG. FIG. 4 is a diagram for explaining processing of recording the same data on a plurality of magnetic tapes via a shared buffer memory; 1 is a block diagram showing an example of a functional configuration of an information processing device; FIG. It is a figure for demonstrating an example of a data recording process. It is a figure for demonstrating an example of a data recording process. 4 is a flowchart showing an example of data recording processing; FIG. 11 is a diagram for explaining processing for delaying recording of data according to a modification;

Embodiments for implementing the technology of the present disclosure will be described in detail below with reference to the drawings.

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.

The tape library 14 includes 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.

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 a slot into a 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.

In this embodiment, data is recorded on a plurality of magnetic tapes T with redundancy. Specifically, the same data is multiplexed and recorded on a plurality of magnetic tapes T, as shown in FIG. 2 as an example. In this embodiment, as shown in FIG. 2, the same data is recorded on two magnetic tapes T, that is, the multiplicity is 2, but the multiplicity may be 3 or more.

Of the two magnetic tapes T, the first magnetic tape T is used as the magnetic tape T for primary data, and the second magnetic tape T is used as the magnetic tape T for sub data. Normally, data is read from the magnetic tape T for positive data. When data cannot be read from the magnetic tape T for primary data, data is read from the magnetic tape T for sub data.

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. 3 , the information processing device 12 includes a CPU (Central Processing Unit) 20 , a memory 21 as a temporary storage area, and a nonvolatile storage section 22 . 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 . CPU 20 is an example of a processor.

The storage unit 22 is realized 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 .

As shown in FIG. 4, the memory 21 stores the data to be recorded on the magnetic tape T when the information processing apparatus 12 performs control to record data on the magnetic tape T. A storage area is reserved for use as a buffer when transmitting to the tape drive 18 . This storage area is hereinafter referred to as buffer memory BM. In this embodiment, the buffer memory BM is not prepared for each magnetic tape T loaded in each of the plurality of tape drives 18, but is prepared as a shared buffer memory BM. In this embodiment, the buffer memory BM is of a ring buffer type.

By the way, the information processing device 12 according to this embodiment receives data transmitted from an external device such as a user terminal and stores the received data in the storage unit 22 . As an example, as shown in FIG. 5, the information processing apparatus 12 according to this embodiment stores the same data stored in the storage unit 22 via a shared buffer memory BM on a plurality of (two in this embodiment) magnetic tapes. It has a function to control recording to T.

Next, with reference to FIG. 6, the functional configuration of the information processing device 12 according to this embodiment will be described. As shown in FIG. 6 , the information processing device 12 includes a determination section 40 , a storage section 42 and a control section 44 . As the CPU 20 executes the information processing program 30 , it functions as a determination section 40 , a storage section 42 and a control section 44 .

The determination unit 40 determines whether the data stored in the buffer memory BM has been recorded on each of the plurality of magnetic tapes T or not. Note that this determination may be omitted when the buffer memory BM has free space for storing data, such as when data is recorded on the magnetic tape T for the first time.

When the determination unit 40 determines that the data stored in the buffer memory BM has been recorded on each of the plurality of magnetic tapes T, the storage unit 42 stores a plurality of data stored in the storage unit 22 as an example of a storage device. Data not yet recorded on the magnetic tape T is stored in the buffer memory BM. At this time, the storage unit 42 stores the unrecorded data on the plurality of magnetic tapes T stored in the storage unit 22 in the area in which the data determined to be recorded by the determination unit 40 of the buffer memory BM is stored. (i.e., overwrite).

The control unit 44 performs control to record unrecorded data on the plurality of magnetic tapes T stored in the buffer memory BM by the storage unit 42 . In this embodiment, the control unit 44 executes this control in parallel by executing the same number of threads as the number of magnetic tapes T. FIG.

A specific example of data recording processing by each of the above functional units will be described with reference to FIGS. 7 and 8. FIG. As shown in FIG. 7, the data stored in the buffer memory BM are assigned addresses indicating the start position and end position of the data in order to access the data. FIG. 7 shows an example in which the address indicating the start position of "data1" is "a" and the address indicating the end position of "data1" and the start position of "data2" is "b".

The control unit 44 controls recording of the data stored in the buffer memory BM on the magnetic tape T. FIG. Then, after the data recording on the magnetic tape T is completed by this control, the control unit 44 stores the address indicating the end position in the buffer memory BM of the data that has been recorded on the magnetic tape T in the pointer variable. . The control unit 44 executes this control for a plurality of magnetic tapes T in parallel. In the example in the upper part of FIG. 7, after "data1" is recorded on the magnetic tape T, the pointer variable stores "b", which is the address indicating the end position of "data1" in the buffer memory BM. Next, in the lower example of FIG. 7, after "data2" is recorded on the magnetic tape T, the pointer variable is rewritten to "c", which is the address indicating the end position of "data2" in the buffer memory BM. That is, the pointer variable stores an address indicating the end position of the data recorded on the magnetic tape T immediately before. This address can also be said to indicate the starting position of the data to be recorded on the magnetic tape T next.

Therefore, the determination unit 40 determines whether the data stored in the buffer memory BM has been recorded on the magnetic tape T by comparing the pointer variables with the addresses indicating the start position and end position of the data stored in the buffer memory BM. It can be determined whether or not Further, since a pointer variable is prepared for each magnetic tape T, the determination unit 40 can determine whether or not the data stored in the buffer memory BM has been recorded on each of the plurality of magnetic tapes T. . In this embodiment, since the buffer memory BM is of the ring buffer type, this determination can be made by simple processing.

Next, as shown in the upper part of FIG. 8, "data1", "data2" and "data3" are stored in the buffer memory BM, "data1" is already recorded on a plurality of magnetic tapes T, and "data2" is A case in which data is being recorded on a plurality of magnetic tapes T will be described. Furthermore, in this case, the case where "data3" is unrecorded on a plurality of magnetic tapes T and "data4" is stored on a plurality of magnetic tapes T in the storage section 22 will be described. Also, here, it is assumed that the buffer memory BM has no free space because "data1", "data2" and "data3" are stored.

In this case, each pointer variable stores an address "b" indicating the end position of "data1" in the buffer memory BM. The determination unit 40 determines that "data1" has been recorded on each of the plurality of magnetic tapes T by comparing the pointer variables with the addresses indicating the start and end positions of the data stored in the buffer memory BM. do. Therefore, in this case, as shown in the lower part of FIG. Store in the area.

Note that the process of determining whether the data stored in the buffer memory BM by the determining unit 40 has been recorded on each of the plurality of magnetic tapes T is not limited to the above example. For example, the determination unit 40 uses a flag that stores a value indicating whether or not each data stored in the buffer memory BM has been recorded on each of the plurality of magnetic tapes T, so that the data is recorded on the plurality of magnetic tapes T. It may be determined whether or not recording has been completed for each.

Next, the operation of the information processing device 12 according to this embodiment will be described with reference to FIG. The data recording process shown in FIG. 9 is executed by the CPU 20 executing the information processing program 30 . The data recording process shown in FIG. 9 is executed, for example, when an execution instruction is input by the user, or when the total size of the data accumulated in the storage unit 22 exceeds a certain value.

In step S10 of FIG. 9, the determination unit 40 determines whether or not the data stored in the buffer memory BM has been recorded on each of the magnetic tapes T, as described above. If this determination is affirmative, the process proceeds to step S12. If the determination in step S10 is negative, the determination unit 40 waits until the data stored in the buffer memory BM is recorded on each of the magnetic tapes T. FIG. As described above, when the recording of the data stored in the buffer memory BM to each of the plurality of magnetic tapes T is completed, the pointer variables corresponding to each of the plurality of magnetic tapes T are updated. As a result, the determination in step S10 becomes an affirmative determination.

In step S12, as described above, the storage unit 42 stores unrecorded data on the plurality of magnetic tapes T stored in the storage unit 22, and stores the data determined to have been recorded in the buffer memory BM in step S10. stored in the specified area. At step S14, the control unit 44 performs control to record data on the plurality of magnetic tapes T that have not yet been recorded on the plurality of magnetic tapes T stored in the buffer memory BM at step S12, as described above. When the process of step S14 ends, the data recording process ends. The above data recording process is repeated, for example, until there is no more unrecorded data on the magnetic tapes T in the storage unit 22 .

As described above, in this embodiment, the same data is recorded in parallel on a plurality of magnetic tapes T via the shared buffer memory BM. At this time, since it is determined whether or not the data stored in the buffer memory BM has been recorded on each of the plurality of magnetic tapes T, even if the shared buffer memory BM is used, the same data can be recorded on a plurality of magnetic tapes. The tape T can be recorded in parallel. Therefore, compared to the case of using a plurality of buffer memories BM corresponding to each of the plurality of magnetic tapes T, the total size of the buffer memories BM when recording the same data in parallel on a plurality of magnetic tapes T can be reduced. can be done.

In the above-described embodiment, the information processing apparatus 12 records the same data on a plurality of magnetic tapes T in parallel, so the progress of the recording process on each magnetic tape T may differ. As shown in FIG. 10 as an example, this difference is represented by a difference in addresses stored in pointer variables. Here, in order to distinguish between the two magnetic tapes T, one is called a magnetic tape T1 and the other is called a magnetic tape T2. In FIG. 10, "data1" has been recorded on the magnetic tape T1, and "data2" and "data3" have not been recorded, and "data1" and "data2" have been recorded on the magnetic tape T2, and "data3" has been recorded. is unrecorded. In this case, the pointer variable corresponding to the magnetic tape T1 stores "b" which is the address in the buffer memory BM of "data2" to be recorded next on each of the plurality of magnetic tapes T. FIG. Also, in this case, the pointer variable corresponding to the magnetic tape T2 stores "c", which is the address in the buffer memory BM of "data3" to be recorded next on each of the plurality of magnetic tapes T. FIG.

Therefore, in the above-described control of recording data in parallel, the control unit 44 controls a relatively large number of data when the difference between the addresses in the buffer memory BM of the data to be recorded next on each of the plurality of magnetic tapes T is equal to or greater than a threshold value. The data recording process on the magnetic tape T on which data has already been recorded may be delayed. In this case, the threshold is set to, for example, the value of the address difference corresponding to the time defined as the upper limit of the allowable range of the time difference in the data recording process for each magnetic tape T. FIG. In the example of FIG. 10, the control unit 44 interrupts the data recording process on the magnetic tape T2 on which more data has been recorded than on the magnetic tape T1. When the recording of "data2" on the magnetic tape T1 is completed and the addresses stored in the pointer variables become equal, the control unit 44 restarts the data recording process on the magnetic tape T2. As a result, it is possible to suppress an increase in the difference in the progress of data recording processing on a plurality of magnetic tapes T. FIG. The method of delaying the data recording process on the magnetic tape T is not limited to interrupting and resuming the recording process. Alternatively, a method of reducing the recording speed of data onto the magnetic tape T may be used.

Further, in the above-described embodiment, for example, the hardware structure of the processing unit (processing unit) that executes various processes such as the determination unit 40, the storage unit 42, and the control unit 44 includes the following various processors ( processor) can be used. 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 FPGA (Field Programmable Gate Array) are manufactured. Programmable Logic Device (PLD), 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 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 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 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 30 may be downloaded from an external device via a network.

10 information processing system 12 information processing device 14 tape library 18 tape drive 20 CPU
21 memory 22 storage unit 23 display 24 input device 25 network I/F
26 External I/F
27 bus 30 information processing program 40 determination unit 42 storage unit 44 control unit BM buffer memories T, T1, T2 magnetic tape

Claims (6)

An information processing device comprising at least one processor and performing control to record the same data on a plurality of magnetic tapes via a shared buffer memory,
The processor
determining whether the data stored in the buffer memory has been recorded on each of the plurality of magnetic tapes;
When it is determined that the data has been recorded on each of the plurality of magnetic tapes, the data determined to have been recorded in the buffer memory is the data that has not been recorded on the plurality of magnetic tapes stored in the storage device. Information processing device that stores in the storage area. The processor
2. The information processing apparatus according to claim 1, wherein control is performed such that data not recorded on said plurality of magnetic tapes stored in said buffer memory is recorded in parallel on each of said plurality of magnetic tapes. The processor
In the parallel recording control, when a difference between addresses on the buffer memory of the data to be recorded next on each of the plurality of magnetic tapes is equal to or greater than a threshold value, the magnetic recording medium in which a relatively large amount of data has been recorded. 3. The information processing apparatus according to claim 2, wherein a process of recording data onto a tape is delayed. The information processing apparatus according to any one of claims 1 to 3, wherein the buffer memory is of a ring buffer system. An information processing method executed by the processor of an information processing device comprising at least one processor and performing control to record the same data on a plurality of magnetic tapes via a shared buffer memory,
determining whether the data stored in the buffer memory has been recorded on each of the plurality of magnetic tapes;
When it is determined that the data has been recorded on each of the plurality of magnetic tapes, the data determined to have been recorded in the buffer memory is the data that has not been recorded on the plurality of magnetic tapes stored in the storage device. A method of processing information that is stored in a stored area. An information processing program to be executed by the processor of an information processing apparatus comprising at least one processor and performing control to record the same data on a plurality of magnetic tapes via a shared buffer memory,
determining whether the data stored in the buffer memory has been recorded on each of the plurality of magnetic tapes;
When it is determined that the data has been recorded on each of the plurality of magnetic tapes, the data determined to have been recorded in the buffer memory is the data that has not been recorded on the plurality of magnetic tapes stored in the storage device. Information processing program stored in the stored area.