JP2018180811A - Storage control device, main controller, storage control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage control device capable of avoiding a situation in which inappropriate processing is performed when HDDs are exchanged by using a mirroring function.SOLUTION: A disk array device 116 exchanges an operation mode from a mirroring mode to a single mode in the case that the number of connections of an HDD 117 in the disk array device 116 reduces after the mirroring mode is set to copy the whole data of the HDD to an HDD 207.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a storage control device, a main controller, a storage control method, and a program.

  There is known a technology called RAID (Redundant Arrays of Inexpensive Disks) that operates as one virtual HDD by combining a plurality of HDDs. In RAID, for example, mirroring that records data of the same content on a plurality of HDDs is performed (see, for example, Patent Document 1). As a result, even if data stored in a certain HDD is damaged, data can be acquired from another HDD in which data having the same content is stored, and the risk of data loss can be reduced. For example, in an MFP with RAID installed, when the mirroring function is set to be effective, while writing of image data is performed to one HDD installed in advance, all data recorded in one HDD is the other. Is replicated on the HDD.

  By the way, in the MFP, S. M. A. R. Failure prediction of each HDD is performed by T (Self-Monitoring Analysis And Reporting Technology), and the replacement time of each HDD is notified. As a result, in the MFP, the service person requested by the user is replaced before each HDD breaks down. The serviceman says that after replacing an HDD (hereinafter referred to as "old HDD") whose replacement time is approaching with a new HDD (hereinafter referred to as "new HDD"), data of the old HDD is migrated to the new HDD. Follow the procedure to replace the HDD. However, in such a procedure, while data is being transferred from the old HDD to the new HDD, the MFP can not receive the execution of a job that requires writing to the HDD, resulting in downtime. In response to this, the MFP performs an HDD replacement process using a mirroring function. In the HDD replacement process using the mirroring function, the service person temporarily connects a new HDD to the MFP and sets the mirroring function to be effective in the MFP in which the mirroring function is previously set to be invalid. As a result, when execution of a job requiring writing to the HDD is received, writing to the old HDD can be performed, and data of the old HDD can be backed up to the new HDD. After that, the serviceman replaces the old HDD with a new HDD and resets the mirroring function to invalid.

Unexamined-Japanese-Patent No. 2006-252451

  However, in the HDD replacement process using the mirroring function, the work procedure by the service person such as setting switching of the mirroring function is increased as compared with the process not using the above-described mirroring function. As a result, there is a problem that the service person performs inappropriate processing.

  An object of the present invention is to provide a storage control device, a main controller, a storage control method, and a program capable of avoiding a situation in which improper processing is performed when replacing an HDD using a mirroring function. It is in.

  In order to achieve the above object, a storage control device of the present invention is a storage control device that performs write control of a connected storage device, and a first operation of writing data in a properly connected first storage device. And a setting unit configured to set one of a second operation mode for copying data written in the first storage device to a second storage device additionally connected, the second operation mode comprising When the number of connected storage devices in the storage control device decreases after all data set and written to the first storage device is replicated to the second storage device, the setting unit is configured to: Switching from the second operation mode to the first operation mode.

  According to the present invention, it is possible to avoid a situation in which improper processing is performed when replacing an HDD using the mirroring function.

FIG. 1 is a block diagram schematically showing a configuration of an MFP provided with a disk array device as a storage control device according to an embodiment of the present invention. FIG. 2 is a block diagram schematically showing the configuration of the disk array system of FIG. 1; It is a flowchart which shows the procedure of the backup process performed by the main controller of FIG. It is a figure which shows an example of the data deletion operation screen displayed on the operation unit of FIG. It is a flowchart which shows the procedure of the operation mode switching process performed by the disk array apparatus of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram schematically showing a configuration of an MFP 100 provided with a disk array device 116 as a storage control device according to an embodiment of the present invention.

  In FIG. 1, the MFP 100 includes a main controller 101, an operation unit 112, a printer unit 113, a finisher unit 114, a scanner unit 115, a disk array device 116, and an HDD 117 as a storage device. In the present embodiment, although a configuration including one storage device is described to facilitate the description, the number of storage devices provided in MFP 100 is not limited to one, and MFP 100 includes a plurality of storage devices. May be The main controller 101 is connected to the operation unit 112, the printer unit 113, the scanner unit 115, and the disk array device 116. The finisher unit 114 is connected to the printer unit 113, and the HDD 117 is connected to the disk array device 116. The main controller 101 includes a CPU 102, a ROM 103, a RAM 104, an operation unit I / F 105, a printer I / F 106, a scanner I / F 107, and a network I / F 108. The CPU 102, the ROM 103, the RAM 104, the operation unit I / F 105, the printer I / F 106, the scanner I / F 107, and the network I / F 108 are connected to one another via a system bus 118.

  The MFP 100 executes jobs such as print processing and scan processing. Also, the MFP 100 performs S. M. A. R. The failure prediction of the HDD 117 is performed by T, and when it is detected that the replacement time of the HDD 117 is approaching, a message urging replacement of the HDD 117 is notified to the operation unit 112. In the MFP 100, a RAID operating as one virtual HDD is implemented by combining a plurality of HDDs.

  The main controller 101 controls the entire MFP 100 in an integrated manner. For example, the main controller 101 sends a write request and a read request to the HDD 117 via the disk array device 116. The CPU 102 executes a program stored in the ROM 103 to control each component of the main controller 101. The ROM 103 stores programs executed by the CPU 102 and data. The RAM 104 is used as a work area of the CPU 102 and as a temporary storage area of each data. The operation unit I / F 105 performs data communication with the operation unit 112. For example, the operation unit I / F 105 transmits, to the CPU 102, information input by an operation of the operation unit 112 by the user. The operation unit I / F 105 also receives a display control signal for switching display content in the operation unit 112 from the CPU 102, and transmits the received display control signal to the operation unit 112. The printer I / F 106 performs data communication with the printer unit 113, and transmits, for example, image data stored in the HDD 117 to the printer unit 113. The scanner I / F 107 performs data communication with the scanner unit 115, for example, acquires image data generated by the scanner unit 115 from the scanner unit 115, and stores the acquired image data in the HDD 117. The network I / F 108 performs wired LAN communication with the PC 110 and the server apparatus 111 connected via the LAN 109, and receives, for example, execution data for executing a job from the PC 110.

  The operation unit 112 is a user interface of the MFP 100, and includes a touch panel display unit and a keyboard (not shown). Operation unit 112 displays a setting screen for performing each setting of MFP 100, an error message, and the like on a display unit (not shown), and receives a user's instruction input by a keyboard operation (not shown). The printer unit 113 prints on a recording sheet based on the image data received from the printer I / F 106. The finisher unit 114 performs a finishing process on the sheet on which printing has been performed. The finishing process is, for example, a stapling process, a punching process (punching process), a saddle stitching process, and a trimming process. The scanner unit 115 includes a line sensor configured by a CCD (Charge Coupled Device) or the like, reads a document placed on a document table (not shown) by the line sensor, and generates image data based on the read information.

  The disk array device 116 receives a write request and a read process from the main controller 101. The disk array device 116 controls execution of data write processing to the HDD 117 based on the received write request, and controls execution of data read processing from the HDD 117 based on the received read request. In the disk array device 116, an operation mode of either single mode or mirroring mode is set, and a setting value indicating the set operation mode is stored in the ROM 103. For example, when the single mode is set, the disk array device 116 performs control such that data is stored only in the HDD 117. On the other hand, when the mirroring mode is set, the disk array device 116 performs control such that data having the same content is stored in a plurality of, for example, two HDDs to be connected to the disk array device 116. The configuration of the disk array system 116 will be described later. The HDD 117 stores image data used when the printer unit 113 performs printing, user setting data regarding the user, and the like.

  FIG. 2 is a block diagram schematically showing the configuration of the disk array device 116 of FIG.

  In FIG. 2, the disk array device 116 includes a device control unit 201, a RAID control unit 202, a format management unit 203, an address calculation unit 204, a host control unit 205, and a status holding unit 206. The RAID control unit 202 is connected to the device control unit 201, the format management unit 203, the address calculation unit 204, the host control unit 205, and the status holding unit 206. The format management unit 203 is also connected to the address calculation unit 204.

  The disk array device 116 comprises a plurality of channels. In the present embodiment, an HDD additionally connected to MFP 100 can be used as an additional memory of MFP 100. The HDD 117 loaded in advance is connected to a preset normal channel among the plurality of channels, and the HDD 207 etc. additionally connected is connected to another channel different from the regular channel. The disk array device 116 is connected to the main controller 101 and the HDDs 117 and 207 by a SATA (Serial ATA) I / F, a SAS (Serial Attached SCSI) I / F, or the like.

  The device control unit 201 instructs the RAID control unit 202 to execute each process based on the write request and the read request received from the main controller 101. The RAID control unit 202 performs RAID control based on the execution instruction received from the device control unit 201. For example, when the RAID control unit 202 executes RAID control to copy data in the HDD 117 to the HDD 207, an access LBA (Logical) indicating an area in which the ID of the HDD 117 as a copy source and data to be copied is stored in the HDD 117 Block addressing) to the format management unit 203. Also, the RAID control unit 202 acquires an address indicating a write area in the HDD 207 as a copy destination from the address calculation unit 204, and instructs the host control unit 205 to execute copy processing based on the acquired address of the HDD 207.

  The format management unit 203 calculates each partition start LBA of the HDD 117 as a copy source in the RAID control and the HDD 207 as a copy destination, and transmits the calculation result to the address calculation unit 204. The address calculation unit 204 calculates the address of the copy destination HDD 207 based on the received calculation result, and transmits the calculated address to the RAID control unit 202.

  The host control unit 205 issues a write request and a read request to the HDD 117 and the HDD 207 based on the copy processing execution instruction received from the RAID control unit 202. State holding unit 206 is a non-volatile memory such as FLASH ROM, and information indicating the state of disk array device 116 immediately before power off of MFP 100 is instructed (hereinafter referred to as “state information before power off”). Hold. The status information before power-off is, for example, information indicating the type and number of HDDs connected to the disk array device 116, and initial setting values of the components of the disk array device 116.

  In the MFP 100, when the replacement time of the HDD 117 approaches, the service person requested by the user replaces the HDD 117 with a new HDD. At this time, even while the data of the HDD 117 is being transferred to the new HDD replaced, the service person performs HDD replacement processing in the mirroring mode in order to be able to receive a job requiring writing of data to the HDD 207. In HDD replacement processing in the mirroring mode, the service person additionally connects a new HDD to the MFP 100 in the MFP 100 in which the single mode is preset, and sets the operation mode of the disk array device 116 to the mirroring mode. After that, when all the data in the HDD 117 is copied to the new HDD, the service man replaces the HDD 117 with the new HDD and returns the operation mode from the mirroring mode to the single mode. However, in the process of replacing the HDD in the mirroring mode, manual operations by the service person, such as switching of the operation mode, are increased. As a result, there is a problem that the service person performs inappropriate processing.

  Corresponding to this, in the present embodiment, when the number of HDDs connected to the disk array device 116 decreases after the mirroring mode is set and the data of the HDD 117 is copied to the new HDD, the mirroring mode to the single mode is performed. Switch to

  FIG. 3 is a flowchart showing the procedure of backup processing executed by the main controller 101 of FIG.

  The process in FIG. 3 is performed by the CPU 102 executing a program stored in the ROM 103, and is performed when the MFP 100 is started.

  In FIG. 3, first, the CPU 102 transmits an HDD connection acquisition command to the disk array device 116 (step S301). When the disk array device 116 receives the HDD connection acquisition command, the information regarding the HDDs currently connected to the disk array device 116 and the information regarding the HDDs included in the status information before power-off held in the status holding unit 206 It is transmitted to the main controller 101. The CPU 102 determines whether a new HDD is additionally connected to the disk array device 116 based on the acquired two pieces of information (step S302).

  As a result of the determination in step S302, when a new HDD is not additionally connected to the disk array device 116, the CPU 102 ends this processing. On the other hand, as a result of the determination in step S302, when a new HDD, for example, the HDD 207, is additionally connected to the disk array device 116, the CPU 102 acquires the setting value of the operation mode from the ROM 103. The CPU 102 determines whether the acquired setting value of the operation mode is the mirroring mode (step S303).

  As a result of the determination in step S303, when the setting value of the operation mode is the mirroring mode, the CPU 102 sets the disk array device 116 to the mirroring mode (step S304), and the present process ends. Thus, the disk array device 116 instructs the HDD 117 to write data to the HDD 117 based on the write request received from the main controller 101, while controlling to copy the data recorded in the HDD 117 to the additionally connected HDD 207. It will be.

  As a result of the determination in step S303, when the setting value of the operation mode is not the mirroring mode, the CPU 102 performs notification regarding the operation of the replacement process of the HDD 117. Specifically, the CPU 102 displays a backup operation screen (not shown) for instructing execution of backup processing of the HDD 117 on the operation unit 112 (step S305). In the backup process of the HDD 117, all data of the HDD 117 is backed up to the HDD 207, and it is notified that the backup is completed. Next, the CPU 102 determines whether an instruction to execute a backup process has been issued by an operation of a backup operation screen (not shown) by the user (step S306).

  As a result of the determination in the step S306, when the execution instruction of the backup process is not performed and the end instruction of the operation of the backup operation screen (not shown) is performed, the CPU 102 ends the present process. On the other hand, when it is determined in step S306 that an instruction to execute backup processing is issued, the CPU 102 sets the disk array device 116 to the mirroring mode (step S307), and executes the backup processing of the HDD 117 in the mirroring mode. The CPU 102 displays a notification screen (not shown) indicating that the backup processing is being performed on the operation unit 112 (step S308). While the notification screen is displayed, the disk array device 116 performs control to copy the data of the HDD 117 to the additionally connected HDD 207, while writing to the HDD 117 based on the write request received from the main controller 101. An instruction is given. When all data in the HDD 117 is copied to the HDD 207, the CPU 102 displays on the operation unit 112 a data delete operation screen 400 of FIG. 4 for selecting whether to delete the data in the HDD 117 as notification that backup is completed. (Step S309). The data deletion operation screen 400 includes a skip button 401 and an execution button 402. The skip button 401 is an operation button for instructing not to delete the data of the HDD 117, and the execution button 402 is an operation button for instructing deletion of the data of the HDD 117. Information related to the user may be stored in the HDD 117. In the present embodiment, when the HDD 117 is replaced, the data delete operation screen 400 is displayed on the operation unit 112 to determine whether to delete the data in the HDD 117 or not. Let the user choose. Next, the CPU 102 determines which of the skip button 401 and the execution button 402 is selected on the data deletion operation screen 400 (step S310).

  As a result of the determination in step S310, when the skip button 401 is selected, the CPU 102 ends the present process. On the other hand, when the execution button 402 is selected as a result of the determination in the step S310, the CPU 102 stops writing the data to the HDD 117 (step S311), deletes all the data in the HDD 117 (step S312). finish. In the replacement process of the HDD 117, after the execution of the process in FIG. 3 is completed, the service person turns off the power of the MFP 100, removes the HDD 117 and the HDD 207, and attaches the HDD 207 to the regular channel.

  In the process of FIG. 3 described above, when the HDD 117 is properly connected, the HDD 207 is additionally connected, and the mirroring mode is not set in the disk array device 116, execution of the process required to replace the HDD 117 with the HDD 207 An operation screen for giving an instruction is displayed on the operation unit 112. That is, the operation screen is displayed in a connection state in which replacement processing of the HDD 117 is expected to be performed. In this way, it is possible to present the service person with an appropriate operating procedure of the process that is required when replacing the HDD 117.

  Further, in the process of FIG. 3 described above, the process required to replace the HDD 117 is a process of backing up data in the HDD 117 and a process of deleting all data in the HDD 117 after completing the execution of the backup process. . As a result, the data of the HDD 117 can be reliably transferred to the HDD 207, and the important information such as the information about the user is held in the HDD 117, and the situation where the important information is leaked from the HDD 117 is avoided. be able to.

  FIG. 5 is a flowchart showing the procedure of the operation mode switching process performed by the disk array device 116 of FIG.

  The processing of FIG. 5 is executed when the processing of FIG. 3 is completed and the power of the MFP 100 is turned off by the service person and then the power of the MFP 100 is turned on.

  In FIG. 5, first, the disk array device 116 acquires information on HDDs currently connected to the disk array device 116 (step S501), and the number of HDDs connected to the disk array device 116 is one. It is determined whether there is any (step S502).

  When it is determined in step S502 that the number of HDDs connected to the disk array device 116 is not one, the CPU 102 performs the processing in step S510 and later described later. On the other hand, when the number of HDDs connected to the disk array device 116 is one as a result of the determination in step S502, the disk array device 116 acquires the status information before the power-off held in the status holding unit 206. (Step S503). The disk array device 116 determines whether an HDD is additionally connected to the disk array device 116 before the power-off, based on the status information before the power-off (step S504).

  As a result of the determination in step S504, when the HDD is not additionally connected to the disk array device 116 before the power is turned off, the disk array device 116 performs the processing of step S510 and later described later. On the other hand, as a result of the determination in step S504, when the HDD, for example, the HDD 207 is additionally connected to the disk array device 116 before the power is turned off, the disk array device 116 selects the normal channel and the normal channel based on the acquired status information before the power is off. Identify HDDs connected to each of the other channels. In this embodiment, as an example, it is assumed that the HDD 117 whose exchange life has come close to the normal channel is connected and the HDD 207 for HDD 117 replacement is connected to another channel before the power is turned off. In the following, connection to a normal channel is referred to as normal connection. Next, the disk array device 116 determines which one of the HDD 117 and the HDD 207 the HDD currently connected properly is (step 505).

  As a result of the determination in the step S505, when the HDD 117 for which the exchange life has approached is normally connected, the disk array device 116 stops writing to the HDD 117 (step S506). Next, the disk array device 116 notifies the main controller 101 of an error indicating that the wrong HDD has been removed (step S507), and performs the processing of step S508 and subsequent steps.

  As a result of the determination in step S505, when the replacement HDD 207 of the HDD 117 is properly connected, the disk array device 116 continues writing to the HDD 207. The disk array device 116 determines whether the set operation mode is a mirroring mode (step 508).

  As a result of the determination in step S508, when the set operation mode is not the mirroring mode, the disk array device 116 performs the processing of step S510 and later described later. On the other hand, when the set operation mode is the mirroring mode as a result of the determination in step S508, the disk array device 116 switches the operation mode from the mirroring mode to the single mode (step S509). Next, the disk array device 116 holds information on the HDDs connected to the disk array device 116 in the state holding unit 206 (step S510), and the process ends.

  According to the process of FIG. 5 described above, if the number of HDDs connected to the disk array device 116 decreases after the mirroring mode is set and all the data of the HDD 117 is replicated to the HDD 207, the mirroring mode is changed to the single mode. Switch. That is, when the execution of the backup of the HDD 117 is completed when the mirroring mode is temporarily used to back up data when replacing the HDD 117, the operation mode returns to the original setting, so that the service man sets the operation mode. There is no need to replace the. Thereby, it is possible to avoid a situation where improper processing is performed when replacing the HDD 117 using the mirroring function.

  Further, in the process of FIG. 5 described above, after the mirroring mode is set and the data of the HDD 117 is replicated to the HDD 207, the number of HDDs connected (connection number) connected to the disk array device 116 decreases and the HDD 207 for replacing the HDD 117 Switches from mirroring mode to single mode if the connection is normal. That is, when the execution of the exchange process from HDD 117 to HDD 207 is completed, the operation mode returns to the original setting. This makes it possible to reliably avoid a situation in which improper processing is performed when replacing the HDD 117 using the mirroring function.

  Furthermore, in the process of FIG. 5 described above, when the number of HDDs connected to the disk array device 116 decreases after the data of the HDD 117 whose replacement time is approaching is copied to the HDD 207 and the HDD 117 remains normally connected, the HDD 117 The writing to is stopped and a warning is notified. As a result, by continuing to use the HDD 117 whose replacement time has come, it is possible to avoid a situation where data is lost.

  As mentioned above, although this invention was demonstrated using embodiment mentioned above, this invention is not limited to embodiment mentioned above. For example, the CPU 102 of the main controller 101 may perform the process of FIG. The CPU 102 transmits a current HDD connection acquisition command to the disk array device 116, and acquires, from the disk array device 116, information on HDDs currently connected to the disk array device 116. The CPU 102 performs the process of step S 502 based on the acquired information, and when the number of HDDs connected to the disk array device 116 is one, the HDD array acquisition command before power off is sent to the disk array device 116. Send. The CPU 102 acquires, from the disk array device 116, the status information before power off held in the status holding unit 206. Next, when the HDD 207 for performing the processes of steps S504 to S505 is properly connected, the CPU 102 performs the processes of step S508 and thereafter. On the other hand, when the HDD 117 is properly connected, the CPU 102 stops the transmission of the write request of the HDD 117 to the disk array device 116. Next, the CPU 102 displays an error message indicating that the wrong HDD has been removed on the operation unit 112, and performs the processing of step S508 and subsequent steps. Thereby, the same effects as those of the above-described embodiment can be obtained.

  Although the case where the storage device is the HDD is described in the above-described embodiment, the storage device is not limited to the HDD, and may be a storage device using a semiconductor or the like.

  The present invention supplies a program that implements one or more functions of the above-described embodiments to a system or apparatus via a network or storage medium, and one or more processors in a computer of the system or apparatus read the program. It can also be realized by the process to be executed. The present invention can also be implemented by a circuit (eg, an ASIC) that implements one or more functions.

101 Main controller 102 CPU
112 Operation unit 116 Disk array device 117, 207 HDD
400 Delete data screen

Claims (10)

A storage control device that performs write control of a connected storage device,
A first operation mode for writing data to a first storage device connected normally and a second operation mode for copying data written to the first storage device to a second storage device additionally connected Equipped with setting means to set either
When the number of storage device connections in the storage control device decreases after the second operation mode is set and all data written to the first storage device are replicated to the second storage device, The storage control device, wherein the setting means switches from the second operation mode to the first operation mode.   After the second operation mode is set and all data written to the first storage device is replicated to the second storage device, the number of connected storage devices in the storage control device decreases and The storage control device according to claim 1, wherein when the two storage devices are properly connected, the setting unit switches the second operation mode to the first operation mode. It is detected that the time to replace the first storage device is approaching,
After the second operation mode is set and all data written to the first storage device is replicated to the second storage device, the number of connected storage devices in the storage control device decreases and The storage control device according to claim 1 or 2, wherein when the one storage device remains connected properly, the writing to the first storage device is stopped and a warning is notified. A main controller that makes a data write request to a storage control device that performs write control of a connected storage device, comprising:
A first operation mode for writing data to a first storage device regularly connected to the storage control device, and a second storage additionally connected to the storage control device for data written to the first storage device The storage control device comprises setting means for setting any one of the second operation modes to be replicated to the device in the storage control device;
The number of connected storage devices in the storage control device after the second operation mode is set in the storage control device and all the data written in the first storage device is copied to the second storage device The main controller, wherein the setting unit switches the setting of the storage control device from the second operation mode to the first operation mode.   The number of connected storage devices in the storage control device after the second operation mode is set in the storage control device and all the data written in the first storage device is copied to the second storage device If the second storage device is properly connected to the storage control device, the setting means may switch the setting of the storage control device from the second operation mode to the first operation mode. The main controller according to claim 4, characterized in that:   The number of connected storage devices in the storage control device after the second operation mode is set in the storage control device and all the data written in the first storage device is copied to the second storage device 6. The method according to claim 4, further comprising stopping writing to the first storage device and notifying of a warning if the first storage device remains connected to the storage control device. Main controller described.   In the storage control device, when the first storage device is properly connected, the second storage device is additionally connected, and the second operation mode is not set, the first storage device is selected. The main controller according to any one of claims 4 to 6, wherein an execution instructing means for instructing execution of a process necessary for replacing the second storage device is notified.   A process required to replace the first storage device with the second storage device is a process of backing up all data written in the first storage device to the second storage device; 8. The main controller according to claim 7, wherein the main controller is a process of deleting all data written to the first storage device after completing the execution of the process to be backed up. A storage control method for performing write control of a storage device connected to a storage control device, comprising:
A first operation mode for writing data to a first storage device regularly connected to the storage control device, and a second storage additionally connected to the storage control device for data written to the first storage device And a setting step of setting any one of the second operation modes to be replicated to the device in the storage control device,
After the second operation mode is set in the storage control device and data written to the first storage device is copied to the second storage device, the number of connected storage devices in the storage control device decreases. In this case, in the setting step, the setting of the storage control device is switched from the second operation mode to the first operation mode. A program that causes a computer to execute a storage control method for performing write control of a storage device connected to a storage control device,
The storage control method is
A first operation mode for writing data to a first storage device regularly connected to the storage control device, and a second storage additionally connected to the storage control device for data written to the first storage device And a setting step of setting any one of the second operation modes to be replicated to the device in the storage control device,
After the second operation mode is set in the storage control device and data written to the first storage device is copied to the second storage device, the number of connected storage devices in the storage control device decreases. In this case, the setting step switches the setting of the storage control device from the second operation mode to the first operation mode.

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