JP7087667B2 - Storage systems, controllers, and control programs - Google Patents

Description

The present invention relates to storage systems, control devices, and control programs.

A virtual tape system including a tape library device and a virtual tape device is known. The tape library device stores a plurality of physical volumes (hereinafter referred to as PV) such as magnetic tape cartridges and optical disk cartridges. The physical volume is an example of a portable recording medium.

The virtual tape device is provided between the host device and the tape library device, and is a disk array that stores data of various servers and a logical volume (hereinafter referred to as LV) which is a volume recognizable by the host device. Equipped with equipment. The disk array device may be realized by a storage device having a redundant configuration such as RAID (Redundant Arrays of Inexpensive Disks).

The virtual tape system makes the host device recognize that the tape library device is connected to the host device by virtually showing the disk array device and various servers in the virtual tape device as a tape library. can.

The virtual tape device stores the write data in the disk array device when the LV data is written by the business JOB executed by the host device. Further, when the virtual tape control software operating in the host device issues an LV ejection (EXPORT) instruction, the virtual tape device transfers the LV stored in the disk array device to the tape library device. Write to PV. As the PV to be written, for example, one of the PVs for discharge registered (designated) in advance is selected. With this function, the administrator can take out the discharged PV from the tape library device and store the data outside the virtual tape system or the like.

Japanese Unexamined Patent Publication No. 2012-185618 Japanese Unexamined Patent Publication No. 2017-33118

In the discharge instruction, a plurality of LVs may be designated as discharge targets. In the discharge processing for a plurality of LVs, the total discharge processing time may be extended and the processing efficiency may be lowered depending on factors such as the data size of the LV to be discharged and the state of the LV in the virtual tape device.

The state of the LV in the virtual tape device includes, for example, a cache state indicating whether or not the LV is stored in the disk array device of the virtual tape device (whether it is on-cache or off-cache).

In one aspect, it is an object of the present invention to efficiently carry out the discharge process of discharging the data to be discharged to a portable recording medium.

In one embodiment, the storage system may include a storage device, a storage device, and a control device. The storage device may have a control unit that controls the write speed of the access unit that writes the write data among the plurality of access units to the portable recording medium according to the size of the write data. The storage device may store data stored in a plurality of portable recording media. The control device may control the storage device and the storage device, and may include a generation unit, a reading unit, and a writing unit. When the generation unit receives an execution request for discharge processing for discharging a plurality of data to be discharged to a portable recording medium to be discharged, the generation unit generates a first list and a second list based on the execution request. It's okay. The first list sorts a list of one or more data to be discharged that are not stored in the storage device in the order in which the data size fluctuates from large to small or in the order in which the data size fluctuates from small to large. It may be a list of data. The second list may be a list in which a list of one or more data to be discharged stored in the storage device is sorted in the same order as the first list based on the data size. The reading unit controls the control unit to read the data to be discharged in the first list from the data storage destination portable recording medium according to the sort order of the first list, and is read out. The data of the discharge target may be stored in the storage device, and the information of the data of the discharge target stored in the storage device may be moved from the first list to the second list . The writing unit reads the data to be discharged in the second list from the storage device according to the sort order of the second list, and records the read data to the control unit in a portable manner of the discharging target. Control of writing to the medium may be performed. Further, each time the writing unit receives a completion response indicating that the data of one discharge target in the second list has been written to the portable recording medium of the discharge target from the control unit, the second list. The information of the data of the one emission target may be deleted from the above, and the second list may be sorted in the same order as the first list based on the data size.

In one aspect, it is possible to efficiently carry out the discharge process of discharging the data to be discharged to the portable recording medium.

It is a figure which shows an example of the data format of PV. It is a figure explaining the gap between tape marks depending on the presence or absence of repositioning. It is a block diagram which shows the configuration example of the virtual tape system as an example of one Embodiment. It is a block diagram which shows the hardware configuration example of the control server and the tape library apparatus shown in FIG. It is a block diagram which shows the functional structure example of the control server shown in FIG. It is a figure which shows an example of a master LV list. It is a flowchart which shows the operation example of the control server which concerns on one Embodiment. It is a figure which shows an example of the export target LV list. It is a figure which shows an example of an on-cache LV list. It is a figure which shows an example of an off-cache LV list.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are merely examples, and there is no intention of excluding various modifications and applications of techniques not specified below. For example, the present embodiment can be variously modified and implemented without departing from the spirit of the present embodiment. In the drawings used in the following embodiments, the parts with the same reference numerals represent the same or similar parts unless otherwise specified.

[1] Embodiment As described above, the processing efficiency of the discharge processing for a plurality of LVs may decrease depending on factors such as the data size of the LV to be discharged and the state of the LV in the virtual tape device. Examples of the factors for reducing the processing efficiency include those exemplified in the following (i) and (ii).

(I) Factors related to the data size of LV.
Drives or controllers that write and read data to PV in tape library devices may have a "speed matching" function.

The "speed matching" function is a function that optimizes the operating speed of the drive according to the data pattern. For example, in the speed matching function, in consideration of "repositioning", the drive writes large-sized data at high speed and small-sized data at low speed to the PV used in the ejection process.

First, "repositioning" will be described. The data format of PV used in the tape library device is shown in FIG. As illustrated in FIG. 1, the PV includes a PV header set at the beginning of the PV, a tape mark (TM) indicating a LV delimiter, an LV header set for each LV, and LV data having a predetermined size. It contains one or more LV blocks separated by (256 bytes in the example of FIG. 1).

The drive stops the writing operation when it writes a tape mark indicating the completion of data writing at the end of the data of each LV.

Further, the drive writes data to the tape by the head while feeding (running) the PV tape by a drive mechanism such as a motor, but the operating speed of the drive mechanism, in other words, the running speed of the tape becomes a specified value. Until, the writing of data to the PV is not started.

Therefore, when the drive finishes writing data and the operation of the drive mechanism stops, a run-up period occurs in which the operation speed of the drive mechanism is increased to a specified value by the time the next data writing is started. Therefore, as shown in FIG. 2A, a “gap” for the run-up period may occur between the LV data written in the PV.

In "repositioning", in order to minimize such "gap", the drive mechanism returns the tape in the rewinding direction opposite to the writing direction before starting the writing of the next data (in other words,). If so, the position of the head is returned to the rewinding direction) (see FIG. 2B). If the drive is operated at high speed, it will take a long run-up period, so the time required for repositioning will be long.

For example, when the drive is operated at high speed with a data pattern in which small sizes are continuous, such as when writing multiple LVs of small sizes in succession, long repositioning frequently occurs and the total write performance is improved. descend. Therefore, the speed matching function operates the drive at a low speed in the case of a continuous data pattern of a small size.

On the other hand, when the drive is operated at a low speed with a data pattern in which a large size is continuous, such as when a plurality of LVs having a large size are continuously written, the repositioning can be completed in a short time, but the writing time becomes long. Therefore, the speed matching function operates the drive at high speed in the case of a continuous data pattern of a large size.

In the ejection process, the virtual tape device is ejected from the tape library apparatus according to the designated order of the LVs to be ejected (for example, the order of description in the list specifying the LVs to be ejected) instructed by the host device. Instruct to write LV to PV. Further, it is difficult to change the switching of the writing speed by the speed matching function according to the data size of the LV.

Therefore, when writing a plurality of small-sized second data several times after writing the first data having a large size to the PV, after writing the first data at high speed, a plurality of writings of the second data are performed. May be faster and longer repositioning processes may occur.

Further, when the second data having a small size is written to the PV and then the first data having a large size is written several times, a plurality of writings of the first data are performed at a low speed after the low speed writing of the second data. Therefore, the writing time becomes long.

(Ii) Factors related to the state of LV.
The virtual tape device is an on-cache process that stores the data of the LV to be discharged on the disk array device when the LV to be discharged does not exist on the disk array device during the execution of the discharge process. After the execution, the process of writing to the discharge PV is performed. In the on-cache process, the virtual tape device reads the LV data from the PV on the tape library device that stores the data of the LV to be discharged and stores it on the disk array device, so that the LV to be discharged is in the on-cache state. To.

Therefore, while the on-cache process is executed for the LV in the off-cache state, the write process of the LV for the discharge PV is stagnant.

Further, when the writing to the discharge PV is stagnant, the discharge PV is temporarily unmounted, and the discharge PV is mounted again after the on-cache processing of the LV is completed. Therefore, it may be difficult to smoothly restart the writing of the LV to the discharge PV after the on-cache processing is completed.

Therefore, in one embodiment, a method of scheduling efficient discharge processing according to the data size and state of LV will be described. By this method, the total emission processing time can be optimized.

[1-1] Configuration Example of Virtual Tape System FIG. 3 is a block diagram showing a configuration example of the virtual tape system 1 as an example of one embodiment. The virtual tape system 1 is an example of a storage system, and as shown in FIG. 3, the virtual tape device 2 and the tape library device 4 may be provided as an example. A host device 5 may be connected to the virtual tape device 2. The virtual tape system 1 may include a plurality of tape library devices 4.

The virtual tape device 2 is interposed between the tape library device 4 and the host device 5, and performs various controls on the tape library device 4 in response to a request from the host device 5.

As shown in FIG. 3, the virtual tape device 2 may optionally include a disk array device 21 and a plurality of control servers 3-1 and 3-2 (two in the example of FIG. 3). In the following description, when the control servers 3-1 and 3-2 are not distinguished, they are simply referred to as the control server 3.

The control server 3 is an example of a control device, and the virtual tape device 2 performs various controls. In one embodiment, when the control server 3 receives the discharge instruction specifying the LV 22 from the host device 5, the control server 3 controls the discharge process for the disk array device 21 and the tape library device 4.

One of the control servers 3-1 and 3-2 (control server 3-1 in the example of FIG. 3) operates as the primary, and the other (control server 3-2 in the example of FIG. 3) fails to the primary. May be on standby as a secondary (standby) that operates when For example, the secondary control server 3-2 may be promoted to the primary and take over the processing of the control server 3 when an abnormality occurs in the primary control server 3-1.

The disk array device 21 is an example of a storage device that stores data stored in a plurality of PV43s, and stores LV22 data related to access between the host device 5 and the tape library device 4.

The disk array device 21 may include a plurality of storage units, and these storage units may form a RAID. Examples of the storage unit include a magnetic disk device such as an HDD (Hard Disk Drive), a semiconductor drive device such as an SSD (Solid State Drive), and the like. The disk array device 21 may provide a file system using a disk group such as RAID.

Although not shown in FIG. 3 for convenience, the virtual tape device 2 may include, for example, a server having a function different from that of the control server 3, a communication device, a power supply device, and the like, in addition to the above-mentioned device. You may have the following equipment.

At least a part of the devices in the virtual tape device 2 and between the virtual tape device 2 and the tape library device 4 are connected to each other by a network such as SAN (Storage Area Network) via an FC (Fibre Channel) cable or the like. It may be connected so that it can communicate with. Further, the other devices in the virtual tape device 2 may be connected to each other so as to be able to communicate with each other by a network such as a LAN (Local Area Network).

The tape library device 4 is an example of a storage device, stores a plurality of PV43s, and accesses the PV43 in response to an instruction from the virtual tape device 2. PV43 is an example of a recording medium for storing data. Examples of the PV43 include magnetic tapes such as LTO (Linear Tape Open) cartridges and optical disk cartridges.

As shown in FIG. 3, the tape library device 4 is exemplified by a plurality of (three or more in the example of FIG. 1) drives 41, two or more (two or more in the example of FIG. 1) robots 42, and A controller 44 may be provided.

The plurality of drives 41 are an example of a medium processing device that records and reproduces data on the PV43 as an example of a portable recording medium, and is an example of a plurality of access units that access the PV43. The robot 42 is an example of a conveyor that picks up, conveys, inserts the PV43 medium cartridge into the drive 41, and the like. The number of drives 41 and the number of robots 42 are examples, and any number of drives 41 may be provided in the tape library device 4.

The controller 44 performs various controls on the tape library device 4. For example, the controller 44 may control the operation of the drive 41 and the robot 42 in response to an instruction (for example, a command) received from the virtual tape device 2, and may transmit a response to the command to the virtual tape device 2.

In one embodiment, since the tape library device 4 has a plurality of drives 41, the controller 44 is configured to write and read to the PV 43 in parallel in response to an instruction from the virtual tape device 2. , A plurality of drives 41 may be controlled.

For example, when the controller 44 receives a plurality of write instructions, a plurality of read instructions, or one or more write instructions and one or more read instructions for different PV43s, the controller 44 is in an empty state (not used). A plurality of drives 41 may be used.

Further, in one embodiment, the controller 44 and the drive 41 have a "speed matching" function in consideration of "repositioning" (see FIG. 2B). That is, the controller 44 controls the PV43 used in the export process so that the drive 41 is operated at high speed for the data of the large LV22 and the drive 41 is operated at low speed for the data of the small LV22. .. The data format of PV43 may be the same as that illustrated in FIG.

As described above, the controller 44 is an example of a control unit that controls the write speed of the drive 41 that writes the write data among the plurality of drives 41 to the PV 43 according to the size of the write data.

The host device 5 is an example of an information processing device that accesses the tape library device 4 via the virtual tape device 2. Examples of the host device 5 include a PC (Personal Computer), a server, a mainframe, and the like.

In the host device 5, for example, software that performs various controls related to the operation of the virtual tape system 1 may be executed. The control by the software may include, for example, control regarding mounting / unmounting of the LV22 in the virtual tape device 2, control regarding export (emission) of the LV22, and the like. The host device 5 and the virtual tape device 2 may be connected to each other so as to be communicable with each other by a network such as a LAN.

[1-2] Hardware Configuration Example Next, with reference to FIG. 4, a hardware configuration example of the control server 3 and the tape library device 4 in the virtual tape system 1 shown in FIG. 3 will be described.

As shown in FIG. 4, the control server 3 is exemplified by a processor 3a, a memory 3b, a storage unit 3c, a tape IF (Interface) 3d-1, an input / output IF3d-2, a host IF3d-3, and a disk IF3d-4. , And a reading unit 3e may be provided.

The processor 3a is an example of an arithmetic processing unit that performs various controls and operations. The processor 3a may be connected to each block 3b to 3e so as to be able to communicate with each other by the bus 3i. As the processor 3a, an integrated circuit (IC; Integrated Circuit) such as a CPU, MPU, DSP, ASIC, and PLD (for example, FPGA) may be used. CPU is an abbreviation for Central Processing Unit, MPU is an abbreviation for Micro Processing Unit, and DSP is an abbreviation for Digital Signal Processor. Further, ASIC is an abbreviation for Application Specific Integrated Circuit, PLD is an abbreviation for Programmable Logic Device, and FPGA is an abbreviation for Field Programmable Gate Array.

The memory 3b is an example of hardware for storing various data and programs. Examples of the memory 3b include a volatile memory, for example, a RAM such as a DRAM (Dynamic RAM). RAM is an abbreviation for Random Access Memory.

The storage unit 3c is an example of hardware for storing various data, programs, and the like. For example, the storage unit 3c may be used as a secondary storage device of the control server 3, and may store programs such as an OS (Operating System), firmware, and applications, and various data. Examples of the storage unit 3c include a magnetic disk device such as an HDD, a semiconductor drive device such as an SSD, and various storage devices such as a non-volatile memory. Examples of the non-volatile memory include flash memory, SCM (Storage Class Memory), ROM (Read Only Memory) and the like. The storage unit 3c may store a program 3f that realizes all or a part of various functions of the control server 3.

The tape IF3d-1, the input / output IF3d-2, the host IF3d-3, and the disk IF3d-4 are connected to and connected to the tape library device 4, the input / output device 3g, the host device 5, and the disk array device 21, respectively. This is an example of a communication IF that controls communication and the like. The input / output device 3g may include, for example, one or both of an input unit such as a mouse, a keyboard, a touch panel, and an operation button, and an output unit such as a display or a printer.

The control server 3 may be provided with a communication IF that controls connection and communication with the administrator's management terminal, or may download the program 3f from a network (not shown) using the communication IF. good.

The reading unit 3e is an example of a reader that reads out data and programs recorded on the recording medium 3h and outputs them to the reading processor 3a. The reading unit 3e may include a connection terminal or an apparatus to which the recording medium 3h can be connected or inserted. Examples of the reading unit 3e include an adapter compliant with USB (Universal Serial Bus), a drive device for accessing a recording disk, a card reader for accessing a flash memory such as an SD card, and the like. The program 3f may be stored in the recording medium 3h.

Examples of the recording medium 3h include a non-temporary computer-readable recording medium such as a magnetic / optical disk or a flash memory. Examples of the magnetic / optical disk include flexible discs, CDs (Compact Discs), DVDs (Digital Versatile Discs), Blu-ray discs, HVDs (Holographic Versatile Discs), and the like. Examples of the flash memory include semiconductor memories such as USB memory and SD card. Examples of the CD include a CD-ROM, a CD-R, a CD-RW, and the like. Examples of DVDs include DVD-ROM, DVD-RAM, DVD-R, DVD-RW, DVD + R, DVD + RW, and the like.

The hardware configuration of the control server 3 described above is an example. Therefore, the increase / decrease of hardware (for example, addition or deletion of arbitrary blocks), division, integration in any combination, addition or omission of buses, etc. in the control server 3 may be performed as appropriate.

Further, the other device provided by the virtual tape device 2 may have the same hardware configuration as the control server 3 shown in FIG.

As shown in FIG. 4, the tape library device 4 is exemplified by the above-mentioned plurality of drives 41 (41-1 to 41-n in the example of FIG. 4; n is an integer of 2 or more), a plurality of robots 42, and the like. In addition to the controller 44, a storage unit 45 for storing the PV43 may be provided.

The controller 44 may have, for example, a hardware configuration such as a processor, a memory, and a storage unit, and at least a part of these may be mounted as an integrated circuit.

[1-3] Functional configuration example Next, a functional configuration example of the control server 3 according to the embodiment will be described. Focusing on the function according to one embodiment, as shown in FIG. 5, the control server 3 may optionally include a memory unit 31, an export control unit 32, a write processing unit 33, and a read processing unit 34. ..

The memory unit 31 may be realized by at least one of the memory 3b and the storage unit 3c (see FIG. 4) of the control server 3. Further, the export control unit 32, the write processing unit 33, and the read processing unit 34 may be realized by the processor 3a of the control server 3 expanding the program 3f into the memory 3b and executing the program 3b.

The memory unit 31 may have a storage area for storing the information of the master LV list 311, the export target LV list 312, the on-cache LV list 313, and the off-cache LV list 314.

FIG. 6 shows an example of the master LV list 311. As shown in FIG. 6, the master LV list 311 is exemplified by "LV name", "cache state", "LV data storage destination PV name", "LV size", "export start time", and "export". The item "number of times" may be included.

The LV name may be set to the name of the LV 22 recognized by the host device 5, and the cache state may be set to “ON” indicating an on-cache state or “OFF” indicating an off-cache state. The name of PV43 for storing the data of LV22 may be set in the LV data storage destination PV name, and the data size of the LV22 may be set in the LV size.

The export start time and the number of times of export may be set to the start time of the export process and the number of times of execution of the export process for each LV22. When the number of exports is 2 or more, the latest start time of the export process may be set as the export start time, or the start time of each of the plurality of export processes may be set.

The master LV list 311 may be updated by the control server 3 each time the information about the LV 22 changes due to each process by the export control unit 32, the write processing unit 33, and the read processing unit 34, which will be described later.

Upon receiving the export instruction from the host device 5, the export control unit 32 controls the execution of the export process. The control may include control of the write processing unit 33 and control of the read processing unit 34. Details of the export control unit 32 will be described later.

When the write processing unit 33 receives the write instruction of the data of the LV 22 from the host device 5, the write processing unit 33 performs the write process according to the cache state of the LV 22 to be written.

When the read processing unit 34 receives a read instruction of the data of the LV 22 from the host device 5 or a read instruction (on-cache instruction) from the write processing unit 33, the read processing unit 34 reads according to the cache state of the LV 22 to be read. Perform processing.

Here, when the disk array device 21 stores the data of the LV 22, the LV 22 is in the “on cache” state. When the LV22 related to the access from the host device 5 is on-cache, the virtual tape device 2 may process the on-cache LV22 on the disk array device 21 and return a response to the host device 5.

For example, when the write target LV22 related to the write instruction from the host device 5 is on-cache, the write processing unit 33 writes data to the LV22 in the disk array device 21. Further, when the read target LV22 related to the read instruction from the host device 5 is on-cache, the read processing unit 34 reads data from the LV22 in the disk array device 21.

On the other hand, the LV 22 that does not exist in the disk array device 21 is in the “off cache” state. When the LV22 related to the access from the host device 5 is off-cache, the virtual tape device 2 may read the data related to the LV22 from the PV43 of the tape library device 4 onto the disk array device 21.

In this way, after turning the off-cache LV22 on-cache, the virtual tape device 2 may perform processing on the LV22 on the disk array device 21 and return a response to the host device 5. The process of reading the off-cache LV22 data from the PV43 of the tape library device 4 to the disk array device 21 is called "on-cache process" or "recall".

For example, when the read target LV22 related to the read instruction from the host device 5 is off-cache, the read processing unit 34 reads the data related to the LV22 from the PV43 of the tape library device 4 onto the disk array device 21. To do. Then, a read process is performed on the LV22 that has become on-cache by the on-cache process.

Further, when the write target LV22 related to the write instruction from the host device 5 is off-cache, the write processing unit 33 issues an on-cache processing instruction (read instruction) to the LV22 to the read processing unit 34. .. Then, the write processing unit 33 performs a write process on the LV22 which has become on-cache by the on-cache process.

Further, the read processing unit 34 according to the embodiment receives an instruction (on-cache instruction) for reading LV22 data from the PV43 in the tape library device 4 accompanying the export process from the export control unit 32. Upon receiving the read instruction from the export control unit 32, the read processing unit 34 executes the on-cache process of the LV 22 related to the read instruction.

For example, the read processing unit 34 instructs the controller 44 of the tape library device 4 to read the data of the LV 46 to be read from the PV 43, and stores the acquired data of the LV 46 as the LV 22 in the disk array device 21 (FIG. FIG. See arrow 5 (1)). The controller 44 sets the on-cache PV43-1 for storing the data of the LV46 in the empty drive 41-1, reads the data of the LV46 to be read by the drive 41-1, and reads the read data. You may respond to unit 34.

Further, the write processing unit 33 according to the embodiment receives an instruction to write LV22 data to the PV43 in the tape library device 4 accompanying the export process from the export control unit 32. Upon receiving the write instruction from the export control unit 32, the write processing unit 33 reads the LV22 to be written from the disk array device 21 and writes the data of the LV22 to the PV43 in the tape library device 4. ..

For example, the writing processing unit 33 instructs the controller 44 of the tape library device 4 to write the data of the LV 22 to the PV 43 to be exported (see the arrow (2) in FIG. 5). The controller 44 sets the PV43-2 for export in the empty drive 41-2, writes the data of one or more LV22s to be written by the drive 41-2 to the PV43-2, and writes the writing result. You may respond to the data processing unit 33.

[1-4] Description of Export Processing When the export control unit 32 receives an export instruction including a list of LV22 to be exported as a parameter from the host device 5, the export control unit 32 performs the export process. Hereinafter, the export process according to the embodiment will be described. The export process may be an export process based on the format of the virtual tape device 2 or a native export process for exporting in the SL (Standard Label) format.

For example, the export control unit 32 sets the list of LV22 in the on-cache state and the list of LV22 in the off-cache state based on the list of LV22 to be exported included in the export instruction and the master LV list 311. Generate.

In the export process, the writing order of the LV22 with respect to the PV43 to be exported is often the order of the instructions from the host device 5, but the writing order is not limited to the order of the instructions. In other words, it is not essential to write in the order of instructions.

Therefore, the export control unit 32 sorts the list of the LV22 in the on-cache state to be the target of the write process and the list of the LV22 in the off-cache state to be the target of the read process using the LV size as a key.

As a result, in the writing process by the writing processing unit 33, which will be described later, a large fluctuation in the writing speed of the LV 22 to the PV 43 is suppressed. Therefore, the writing speed can be changed slowly, and the delay in the writing process due to repositioning can be minimized.

Next, the export control unit 32 compares the total data amount Son of the LV22 in the on-cache state with the total data amount Soff of the LV22 in the off-cache state. When Soff is larger than Son, the export control unit 32 reads LV22 data from PV43 in order from the top of the list to the read processing unit 34 and stores it in the disk array device 21 until Son becomes Soff or more. Instruct that.

In this way, the read processing unit 34 gives priority to the on-cache processing while the Soff is larger than the Son, so that the on-cache processing of the LV22 in the off-cache state is the writing processing to the PV43 to be exported. Make it complete before.

When Son becomes Soff or higher, the export control unit 32 performs write processing to the PV43 to be exported and on-cache processing of the LV22 in the off-cache state in parallel for the write processing unit 33 and the read processing unit 34. To execute.

For example, the export control unit 32 instructs the write processing unit 33 to write the data of the LV 22 to the PV 43 to be exported in order from the top of the on-cache list. Further, the export control unit 32 instructs the read processing unit 34 to read the data of the LV 22 from the PV 43 in order from the top of the list and store it in the disk array device 21 in parallel with the writing process.

When the LV22 in the off-cache state is put into the on-cache state by the read process, the export control unit 32 moves the LV22 from the off-cache list to the on-cache list and sorts the on-cache list again.

As described above, when a plurality of drives 41 can be used in the tape library device 4, the write process for writing the LV22 in the on-cache state to the PV43 and the read process for reading the LV22 in the off-cache state from the PV43 are performed in parallel. It is possible to carry out. Since the parallel execution of the write process and the read process is executed when Son is Off or higher, the on-cache process of all LV22s in the off-cache state ends before the write process of all LV22s to be exported. You can expect to do it. Therefore, during the on-cache process (during the process of reading the data from PV43 to LV22), it is possible to suppress the stagnation of the write process due to the waiting for the on-cache process in the write process to the PV43 to be exported.

[1-5] Operation Example Next, an operation example of the virtual tape system 1 (control server 3) configured as described above will be described with reference to FIG. 7.

When an export instruction with a list of LV22s to be exported (for example, a list of LV names) as a parameter is received from the host device 5, the export control unit 32 executes the export process. In the export process, the export control unit 32 creates an export target LV list 312 (hereinafter, may be referred to as “Le”) based on the received list (step S1).

FIG. 8 is a diagram showing an example of the LV list 312 to be exported. As shown in FIG. 8, the list Le optionally includes items of the “LV name” of the LV22 to be exported, the “cache state” of the LV22, the “LV data storage destination PV”, and the “LV size”. It's fine.

For example, the export control unit 32 may create the list Le by extracting the information of the entry corresponding to the LV name to be exported included in the export instruction from the master LV list 311. Examples of the information information from the master LV list 311 include information on "cache state", "LV data storage destination PV", and "LV size".

Returning to the description of FIG. 7, the export control unit 32 determines whether or not the LV22 in the off-cache state exists in the created list Le (step S2).

When the LV22 in the off-cache state exists in the list Le (Yes in step S2), the export control unit 32 classifies the LV22 included in the list Le based on the cache state. Then, the export control unit 32 has an on-cache LV list 313 (hereinafter, may be referred to as “Lon”) and an off-cache LV list 314 (hereinafter, may be referred to as “Loff”) based on the classification result. To create.

For example, the export control unit 32 extracts the entry of the LV22 in the off-cache state from the list Le, creates the list Loff, and acquires the total LV size Soff in the list Loff (step S3). Further, the export control unit 32 sorts the entries in the created list Loff in order of LV size (step S4). As described above, the list Loff is an example of the first list in which a list of one or more data to be discharged that is not stored in the disk array device 21 is sorted based on the data size.

Further, the export control unit 32 extracts the entry of the LV22 in the on-cache state from the list Le, creates the list Lon, and acquires the total LV size Son in the list Lon (step S5). Further, the export control unit 32 sorts the created list Lon entries in order of LV size (step S6). As described above, the list Lon is an example of a second list in which a list of one or more data to be discharged stored in the disk array device 21 is sorted based on the data size.

In steps S3 and S5, the export control unit 32 may calculate the total LV size Soff or Son by summing the LV sizes of all the entries in the list Loff or Lon. Steps S5 and S6 may be performed before steps S3 and S4, or may be performed in parallel with steps S3 and S4 by a plurality of processes.

As described above, when the export control unit 32 receives the execution request of the discharge process for discharging the data of the plurality of discharge targets to the PV 43 of the discharge target, the export control unit 32 generates the first list and the second list based on the execution request. This is an example of a generator.

9 and 10 are diagrams showing an example of a sorted on-cache LV list 313 and an off-cache LV list 314, respectively. As illustrated in FIG. 9, the list Lon may be a list obtained by extracting the entries of LV22 whose cache state is "ON" from the list Le and sorting them in descending order using the LV size as a key. Further, as illustrated in FIG. 10, Loff may be a list obtained by extracting the entries of LV22 whose cache state is "OFF" in Le and sorting them in descending order using the LV size as a key.

In the examples of FIGS. 9 and 10, the entries are sorted in the order in which the LV size changes from large to small (that is, in descending order), but the entry is not limited to this, and the entries have an LV size. It may be sorted in the order of variation from small to large (that is, descending order).

Alternatively, the entries may be sorted to repeat the order in which the LV size varies from large to small and the order in which the LV size varies from small to large. As an example, entries may be sorted so that the LV size is small at the beginning and end of the list and large at the center of the list, or large at the beginning and end of the list and small at the center of the list. May be sorted into. Also, as another example, the entries may be sorted so that the LV size draws a "waveform" from the beginning to the end of the list (large to small, and small to large, repeating). ..

In this way, the export control unit 32 sorts each of Lon and Loff so that the LV size changes gently. As a result, as will be described later, in the process of writing the LV22 to the PV43 based on Lon, it is possible to suppress a large change in the writing speed of the LV22 to the PV43 due to the LV size. Therefore, since the writing speed can be changed slowly, the delay in the writing process due to the repositioning can be minimized.

The export control unit 32 may use any of the above sort rules for sorting Lon and Loff, and may use the same sort rule for Lon and Loff. By using the same sort rule for Lon and Loff, the LV size of the on-cache processed LV22 added to the Lon in the processing of steps S9 and S15 described later and the LV size of the LV22 in the Lon The difference between them can be reduced. Therefore, even after the on-cache processing is performed, it is possible to suppress a large fluctuation in the writing speed.

Returning to the description of FIG. 7, the export control unit 32 compares the total LV size Son and Soff acquired for each of Lon and Loff, and determines whether Soff <Son or not (step S7). When Soff <Son is not satisfied (No in step S7), the export control unit 32 instructs the read processing unit 34 to execute the on-cache processing.

For example, the export control unit 32 acquires the LV name and the LV data storage destination PV name (see FIG. 10) of the first entry of the list Loff, and reads the LV name LV46 from the LV data storage destination PV name (ON). The cache instruction) is issued to the read processing unit 34.

Upon receiving the read instruction, the read processing unit 34 instructs the controller 44 of the tape library device 4 to read the data of the LV name LV46 from the LV data storage destination PV name (in other words, the on-cache PV43). .. Then, the read processing unit 34 writes the data of the LV 46 returned from the controller 44 to the disk array device 21 as the LV 22 (step S8), and responds to the export control unit 32 that the on-cache processing is completed.

When the export control unit 32 receives the response of completion, the entry of the LV22 is moved from the list Loff to the list Lon (deleted from the list Loff and added to the list Lon) (step S9), and the process proceeds to step S6. .. In step S9, when the entry (the export target and the LV22 in the off-cache state) no longer exists in the list Loff, the export control unit 32 may delete the list Loff.

In step S6 shifted from step S9, the export control unit 32 sorts the Lons after the entry is added in step S9 in order of LV size. In this way, in steps S6 to S9, LV22s are selected one by one from the list Loff until Soff <Son, and on-cache processing of the selected LV22 is performed.

In other words, it can be said that the export control unit 32 suppresses the execution of the write process until the total size related to Loff becomes equal to or less than the total size related to Lon. In this way, the export control unit 32 compares the total size of the data to be discharged in Loff with the total size of the data to be discharged in Lon, and controls the execution timing of the write process based on the comparison result. This is an example of the execution control unit.

In step S7, if Soff <Son (Yes in step S7), the process proceeds to step S10. In step S10, the export control unit 32 determines whether or not the LV22 in the off-cache state exists. For example, the export control unit 32 may determine whether or not the list Loff exists or whether or not an entry exists in the list Loff as the process of step S10.

When the LV22 in the off-cache state exists (Yes in step S10), the process is the read process (on-cache process) of step S13 (steps S13 to S16) and the write process of step S17 (steps S17 to S21). Move to both.

The export control unit 32 may execute the read process of step S13 (steps S13 to S16) and the step S17 (steps S17 to S21) in parallel. In other words, when the total size related to Loff becomes equal to or less than the total size related to Lon, the export control unit 32 can be said to execute the writing process in parallel with the reading process.

By performing the read process and the write process in parallel, it is possible to avoid write stagnation in the PV43 due to waiting for the on-cache process, and to effectively utilize resources such as the drive 41.

Further, by executing the read process until the total size related to Lon exceeds the total size related to Loff, a sufficient amount of LV22 to be exported can be put into the on-cache state in advance. In this way, by creating a state in which the read process ends before the write process, it is possible to prevent the PV43 for export from being unmouted due to waiting for the on-cache process.

On the other hand, when the LV22 in the off-cache state does not exist (No in step S10), the process shifts to the write process in step S17 (steps S17 to S21).

In step S2, when the LV22 in the off-cache state does not exist in the list Le (No in step S2), the export control unit 32 executes the same processes of steps S11 and S12 as in steps S5 and S6, and the process is performed. The process proceeds to step S17. For example, in step S11, the export control unit 32 extracts the entries of the LV22 in the on-cache state (in this case, all the entries in the list Le) from the list Le, creates the list Lon, and totals the list Lon. Acquire LV size Son. Further, the export control unit 32 sorts the entries of the created list Lon in the order of LV size in step S12.

In the read process, the export control unit 32 selects one LV22 to be processed from the list Loop (step S13). For example, the export control unit 32 may select the first entry in the list Loff.

Next, the export control unit 32 acquires the LV name and the LV data storage destination PV name (see FIG. 10) of the selected entry, and reads the LV name LV46 from the LV data storage destination PV name (on-cache instruction). Is issued to the read processing unit 34.

Upon receiving the read instruction, the read processing unit 34 instructs the controller 44 of the tape library device 4 to read the data of the LV name LV46 from the LV data storage destination PV name (in other words, the on-cache PV43). .. Then, the read processing unit 34 writes the data of the LV 46 returned from the controller 44 to the disk array device 21 as the LV 22 (step S14), and responds to the export control unit 32 that the on-cache processing is completed.

Upon receiving the completion response, the export control unit 32 moves the entry of the LV22 from the list Loff to the list Lon (step S15), and the process shifts to the step S16. When the entry does not exist in the list Loff, the export control unit 32 may delete the list Loff in the same manner as in step S9.

In step S16, the export control unit 32 determines whether or not the off-cache state LV22 exists (for example, whether or not the list Loop exists, or whether or not an entry exists in the list Loop). ..

When the LV22 in the off-cache state exists (Yes in step S16), the process proceeds to step S13. On the other hand, when the LV22 in the off-cache state does not exist (No in step S16), the read process ends, and the export control unit 32 waits for the end of both the read process and the write process (step S22), and the export process ends. Is finished.

As described above, the export control unit 32 and the read processing unit 34 that perform the read processing in each of steps S8 and S9 and steps S13 to S16 are examples of the reading unit that performs the following processing. In this process, the tape library device 4 is controlled to read the data of the discharge target in the Loff from the storage destination PV43 of the data according to the sort order of the Loff, and the read data of the discharge target is read out from the disk array device. The process to be stored in 21 may be included.

In the writing process, the export control unit 32 selects one LV22 to be processed from the list Lon (step S17). For example, the export control unit 32 may select the first entry in the list Lon.

Next, the export control unit 32 acquires the LV name (see FIG. 9) of the selected entry, and issues a write instruction to write the data of the LV 22 of the LV name to the PV 43 to be exported to the write processing unit 33.

Upon receiving the write instruction, the write processing unit 33 instructs the controller 44 of the tape library device 4 to write the data of the LV name LV22 to the PV43 for export (step S18). Then, when the write processing unit 33 receives the write completion response from the controller 44, the write processing unit 33 responds to the export control unit 32 with the completion of the write processing.

Upon receiving the completion response, the export control unit 32 deletes the entry of the LV22 from the list Lon (step S19). When the entry does not exist in the list Lon, the export control unit 32 may delete the list Lon.

Further, since the LV22 for which the on-cache processing has been completed may be added to the list Lon during the writing process, the export control unit 32 sorts the list Lon in the order of the LV size (step S20), and the process is stepped. Move to S21. In this way, the export control unit 32 and the write processing unit 33 sort the Lon based on the data size each time the control is performed to write the data of the discharge target in the Lon to the PV 43 of the discharge target.

By processing the LV 22 in the order of data size in the writing process, it is possible to suppress a large fluctuation in the writing speed in the drive 41 and minimize the influence of the export processing delay due to the repositioning.

In step S21, the export control unit 32 determines whether or not the LV22 in the on-cache state exists (for example, whether or not the list Lon exists or whether or not an entry exists in the list Lon). ..

When the LV22 in the on-cache state exists (Yes in step S21), the process proceeds to step S17. On the other hand, when the LV22 in the on-cache state does not exist (No in step S21), the write process ends, and the export control unit 32 waits for the end of both the read process and the write process (step S22) and exports. The process ends.

As described above, the export control unit 32 and the write processing unit 33 that perform the writing process in steps S17 to S21 are examples of the writing unit that performs the following processing. The process includes a process of reading the data to be discharged from the disk array device 21 in the Lon according to the sort order of the Lon and controlling the tape library device 4 to write the read data to the PV43 to be discharged. It's fine.

In the above description, the case where the controller 44 uses one drive 41 each in the read process and the write process has been given as an example, but the present invention is not limited to this. For example, when a plurality of free drives 41 exist, the export control unit 32, and the write processing unit 33 and the read processing unit 34 utilize the plurality of free drives 41 in the processing of steps S8, S14, and S18. The writing process and the reading process may be controlled.

In this case, the export control unit 32 selects the number of LV22 entries corresponding to the number of free drives 41 available for write processing or read processing in steps S8, S13 and S14, and S17 and S18. good. The number of available free drives 41 may be notified from, for example, the controller 44.

By the above processing, the control server 3 can effectively use the speed matching function of the tape library device 4. As a result, resources such as the drive 41 of the tape library device 4 can be effectively used, the read process and the write process can be optimized, and the export process time can be shortened.

[2] Others The technique according to the above-described embodiment can be modified or modified as follows.

For example, each functional block of the control server 3 shown in FIG. 5 may be merged or divided in any combination.

Further, the export control unit 32 has described that the export target LV list 312 is created in response to the export instruction, but the present invention is not limited to this. For example, the export control unit 32 may create Loop and Lon based on the list of LV22 to be exported included in the export instruction and the master LV list 311. In this case, the creation of the export target LV list 312 may be performed. It may be omitted.

[3] Additional notes The following additional notes will be further disclosed with respect to the above embodiments.

(Appendix 1)
A storage device having a control unit that controls the write speed of the access unit that writes the write data among the plurality of access units to the portable recording medium according to the size of the write data.
A storage device that stores data stored in multiple portable recording media,
A control device for controlling the storage device and the storage device is provided.
The control device is
Upon receiving a discharge processing execution request for discharging a plurality of discharge target data to the discharge target portable recording medium, a list of one or more discharge target data not stored in the storage device is displayed based on the execution request. A generator that generates a first list sorted based on the data size and a second list sorted based on the data size of one or more lists of data to be discharged stored in the storage device.
According to the sort order of the first list, the control unit is controlled to read the data of the discharge target in the first list from the portable recording medium in which the data is stored, and the read data of the discharge target is read. With a reading unit that stores the data in the storage device,
According to the sort order of the second list, the data to be discharged in the second list is read from the storage device, and the control unit is controlled to write the read data to the portable recording medium to be discharged. A storage system with a writing unit.

(Appendix 2)
The sort order of each of the first list and the second list is the order in which the data size fluctuates from large to small, the order in which the data size fluctuates from small to large, or the data size from large to small. The storage system according to Appendix 1, wherein the order of fluctuation and the order of fluctuation from small to large are repeated.

(Appendix 3)
The reading unit moves the information of the data to be discharged stored in the storage device from the first list to the second list.
The writing unit sorts the second list based on the data size each time the data to be discharged in the second list is written to the portable recording medium to be discharged. The storage system described.

(Appendix 4)
The total size of the data to be discharged in the first list is compared with the total size of the data to be discharged in the second list, and the execution timing of the process by the writing unit is controlled based on the comparison result. The storage system according to Appendix 3, which is equipped with an execution control unit.

(Appendix 5)
The storage system according to Appendix 4, wherein the execution control unit suppresses execution of processing by the writing unit until the total size of the first list is equal to or less than the total size of the second list.

(Appendix 6)
When the total size of the first list is equal to or less than the total size of the second list, the execution control unit executes the processing by the writing unit in parallel with the processing by the reading unit. Or the storage system according to Appendix 5.

(Appendix 7)
A storage device having a control unit that controls the writing speed of the access unit that writes the write data among the plurality of access units to the portable recording medium according to the size of the write data, and a plurality of portable recording media. A control device that controls a storage device that stores data stored in the
Upon receiving a discharge processing execution request for discharging a plurality of discharge target data to the discharge target portable recording medium, a list of one or more discharge target data not stored in the storage device is displayed based on the execution request. A generator that generates a first list sorted based on the data size and a second list sorted based on the data size of one or more lists of data to be discharged stored in the storage device.
According to the sort order of the first list, the control unit is controlled to read the data of the discharge target in the first list from the portable recording medium in which the data is stored, and the read data of the discharge target is read. With a reading unit that stores the data in the storage device,
According to the sort order of the second list, the data to be discharged in the second list is read from the storage device, and the control unit is controlled to write the read data to the portable recording medium to be discharged. A control device that has a writing unit.

(Appendix 8)
The sort order of each of the first list and the second list is the order in which the data size fluctuates from large to small, the order in which the data size fluctuates from small to large, or the data size from large to small. The control device according to Appendix 7, wherein the order of variation and the order of variation from small to large are repeated.

(Appendix 9)
The reading unit moves the information of the data to be discharged stored in the storage device from the first list to the second list.
In Appendix 7 or Appendix 8, the writing unit sorts the second list based on the data size each time it controls to write the data to be discharged in the second list to the portable recording medium to be discharged. The control device described.

(Appendix 10)
The total size of the data to be discharged in the first list is compared with the total size of the data to be discharged in the second list, and the execution timing of the process by the writing unit is controlled based on the comparison result. The control device according to Appendix 9, which comprises an execution control unit.

(Appendix 11)
The control device according to Appendix 10, wherein the execution control unit suppresses execution of processing by the writing unit until the total size according to the first list becomes equal to or less than the total size according to the second list.

(Appendix 12)
When the total size of the first list is equal to or less than the total size of the second list, the execution control unit executes the processing by the writing unit in parallel with the processing by the reading unit. Alternatively, the control device according to Appendix 11.

(Appendix 13)
A storage device having a control unit that controls the writing speed of the access unit that writes the write data of the plurality of access units to the portable recording medium according to the size of the write data, and a plurality of portable recording media. To the computer that controls the storage device that stores the data stored in
Upon receiving a discharge processing execution request for discharging a plurality of discharge target data to the discharge target portable recording medium, a list of one or more discharge target data not stored in the storage device is displayed based on the execution request. A first list sorted based on the data size and a second list sorted based on the data size of one or more lists of data to be discharged stored in the storage device are generated.
According to the sort order of the first list, the control unit is controlled to read the data of the discharge target in the first list from the portable recording medium in which the data is stored, and the read data of the discharge target is read. Is stored in the storage device,
According to the sort order of the second list, the data to be discharged in the second list is read from the storage device, and the control unit is controlled to write the read data to the portable recording medium to be discharged. ,
A control program that executes processing.

(Appendix 14)
The sort order of each of the first list and the second list is the order in which the data size fluctuates from large to small, the order in which the data size fluctuates from small to large, or the data size from large to small. The control program according to Appendix 13, wherein the order of variation and the order of variation from small to large are repeated.

(Appendix 15)
To the computer
The information of the data to be discharged stored in the storage device is moved from the first list to the second list.
Each time the data of the discharge target in the second list is controlled to be written to the portable recording medium of the discharge target, the second list is sorted based on the data size.
The control program according to Appendix 13 or Appendix 14, which executes the process.

(Appendix 16)
To the computer
The total size of the data to be discharged in the first list is compared with the total size of the data to be discharged in the second list, and the execution timing of the writing control is controlled based on the comparison result.
The control program according to Appendix 15, which executes the process.

(Appendix 17)
To the computer
The execution of the write control is suppressed until the total size according to the first list becomes equal to or less than the total size according to the second list.
The control program according to Appendix 16 for executing the process.

(Appendix 18)
To the computer
The control program according to Appendix 16 or Appendix 17, wherein when the total size according to the first list is equal to or less than the total size according to the second list, the write control is executed in parallel with the read control.

1 Virtual tape system 2 Virtual tape device 21 Disk array device 22, 46 LV
3, 3-1, 3-2 Control server 31 Memory unit 311 Master LV list 312 Export target LV list 313 On-cache LV list 314 Off-cache LV list 32 Export control unit 33 Write processing unit 34 Read processing unit 4 Tape library device 41,41-1 to 41-n drive 42 Robot 43,43-1,43-2 PV
44 Controller 45 Storage 5 Host device

Claims (6)

A storage device having a control unit that controls the write speed of the access unit that writes the write data among the plurality of access units to the portable recording medium according to the size of the write data.
A storage device that stores data stored in multiple portable recording media,
A control device for controlling the storage device and the storage device is provided.
The control device is
Upon receiving a discharge processing execution request for discharging a plurality of discharge target data to the discharge target portable recording medium, a list of one or more discharge target data not stored in the storage device is displayed based on the execution request. A first list sorted in the order in which the data size fluctuates from large to small or in the order in which the data size fluctuates from small to large, and a list of one or more data to be discharged stored in the storage device. A generation unit that generates a second list sorted in the same order as the first list based on the data size.
According to the sort order of the first list, the control unit is controlled to read the data of the discharge target in the first list from the portable recording medium in which the data is stored, and the read data of the discharge target is read. In the storage device, and a reading unit that moves the information of the data to be discharged stored in the storage device from the first list to the second list .
According to the sort order of the second list, the data to be discharged in the second list is read from the storage device, and the control unit is controlled to write the read data to the portable recording medium to be discharged. With a writing part ,
Each time the writing unit receives a completion response indicating that the data of one discharge target in the second list has been written to the portable recording medium of the discharge target from the control unit, the writing unit receives the data from the second list. A storage system that deletes information on one piece of data to be discharged and sorts the second list in the same order as the first list based on the data size . The total size of the data to be discharged in the first list is compared with the total size of the data to be discharged in the second list, and the execution timing of the process by the writing unit is controlled based on the comparison result. The storage system according to claim 1 , further comprising an execution control unit. The storage system according to claim 2 , wherein the execution control unit suppresses execution of processing by the writing unit until the total size according to the first list becomes equal to or less than the total size according to the second list. A claim that the execution control unit executes a process by the write unit in parallel with a process by the read unit when the total size according to the first list is equal to or less than the total size according to the second list. 2 or the storage system according to claim 3 . A storage device having a control unit that controls the writing speed of the access unit that writes the write data among the plurality of access units to the portable recording medium according to the size of the write data, and a plurality of portable recording media. A control device that controls a storage device that stores data stored in the
Upon receiving a discharge processing execution request for discharging a plurality of discharge target data to the discharge target portable recording medium, a list of one or more discharge target data not stored in the storage device is displayed based on the execution request. A first list sorted in the order in which the data size fluctuates from large to small or in the order in which the data size fluctuates from small to large, and a list of one or more data to be discharged stored in the storage device. A generation unit that generates a second list sorted in the same order as the first list based on the data size.
According to the sort order of the first list, the control unit is controlled to read the data of the discharge target in the first list from the portable recording medium in which the data is stored, and the read data of the discharge target is read. In the storage device, and a reading unit that moves the information of the data to be discharged stored in the storage device from the first list to the second list .
According to the sort order of the second list, the data to be discharged in the second list is read from the storage device, and the control unit is controlled to write the read data to the portable recording medium to be discharged. With a writing part ,
Each time the writing unit receives a completion response indicating that the data of one discharge target in the second list has been written to the portable recording medium of the discharge target from the control unit, the writing unit receives the data from the second list. A control device that deletes information on one piece of data to be discharged and sorts the second list in the same order as the first list based on the data size . A storage device having a control unit that controls the writing speed of the access unit that writes the write data of the plurality of access units to the portable recording medium according to the size of the write data, and a plurality of portable recording media. To the computer that controls the storage device that stores the data stored in
Upon receiving a discharge processing execution request for discharging a plurality of discharge target data to the discharge target portable recording medium, a list of one or more discharge target data not stored in the storage device is displayed based on the execution request. A first list sorted in the order in which the data size fluctuates from large to small or in the order in which the data size fluctuates from small to large, and a list of one or more data to be discharged stored in the storage device. A second list sorted in the same order as the first list based on the data size is generated.
According to the sort order of the first list, the control unit is controlled to read the data of the discharge target in the first list from the portable recording medium in which the data is stored, and the read data of the discharge target is read. Is stored in the storage device, and the information of the data to be discharged stored in the storage device is moved from the first list to the second list.
According to the sort order of the second list, the data to be discharged in the second list is read from the storage device, and the control unit is controlled to write the read data to the portable recording medium to be discharged. ,
Execute the process ,
The writing control is one from the second list each time a completion response indicating that the data of one discharge target in the second list has been written to the portable recording medium of the discharge target is received from the control unit. A control program including a process of deleting information on data to be discharged and sorting the second list in the same order as the first list based on the data size .

Images