JP4825187B2 - Storage device system and control method of storage device system - Google Patents

Description

  The present invention relates to a storage device system and a storage device system configuration method, and can be operated without stopping the operation of the system when the storage control device changes the configuration from one to a plurality of devices. In either form, the present invention relates to a storage device system suitable for centrally managing system management information and a method for configuring the storage device system.

  From large-scale storage systems required in data centers in companies to small-scale storage systems required in the general open market, the performance and storage capacity required for storage systems vary greatly depending on the application. Yes.

  To cope with the scalability problem required for this storage device system, conventionally, a storage computer system connected to the host computer is added, and the storage device systems are connected by a transfer path used for connection to the host computer. In such a case, a switch is connected between the storage system and the storage system.

  As another method of dealing with the scalability problem required for the storage device system, a method of combining components of a plurality of storage device systems and making the host computer appear to one storage device system can be considered. For example, there is a method in which a data transfer path and a management information transfer path in each storage device system are coupled to each other, and a plurality of storage device systems are combined into one storage device system.

  On the other hand, the conventional storage system control program assumes that the storage system to be controlled has a single storage system structure, both physically and logically. For this reason, in the case where a plurality of small storage device systems are combined to form a single storage device system, when the whole is not logically considered as a single storage device system, It is necessary to change the basic recognition, the change range extends to the entire control program, and the change scale becomes extremely large.

  For this reason, even when components of a plurality of storage device systems are combined to form a single storage device system, there is a demand to regard the structure of the storage device system as a logical single unit and divert the control program. is there.

  When the storage system structure is considered to be logically single, the storage system management information has consistency that cannot be divided for each component of the storage system, similar to conventional storage system management information. Information. For this reason, in order to store the management information, it is necessary to secure a logically continuous memory area as in the conventional storage device system.

  As a method of securing a memory area for storing management information, there is a method of using a management information memory distributed among components of each storage device system. However, managing the management information memory physically distributed as one logical makes it difficult to realize the maintenance function. This is because a conventional storage device system physically stores management information in a single management information memory.

  For example, if an arbitrary small storage system is removed from a state where multiple storage system components are combined and shown as a single storage system, the area that stores part of the management information is lost. It will be. The management information is consistent information that cannot be divided, and even if a part of the management information is lost, the whole becomes unusable. Therefore, it is necessary to stop the storage device system as it is.

  On the other hand, regarding the feasibility of the maintenance function by distributing the parts other than the management information memory storing the management information to each small storage device system, in the conventional storage device system, other than the management information memory Since the component has a partial blockage / maintenance / recovery function, the conventional method can be used relatively easily.

  In the conventional method of combining the components of a plurality of storage device systems to form one storage device system, the management method of the entire storage device system is not considered.

  For this reason, when trying to divert the control program of the conventional storage device system, there is a problem that the scale of change of the control program becomes extremely large and diversion becomes difficult.

  Further, in the conventional method of combining the components of a plurality of storage device systems into a single storage device system, when managing the storage device system logically as a single storage device system, each small storage device system It does not consider how to store management information of a storage system with consistency that cannot be divided into two.

  For this reason, the management information is stored in the management information memory of each physically distributed small storage system, making it difficult to realize the maintenance function. Further, there is a problem that the access performance deteriorates when the management information is physically distributed.

  Further, the conventional technology does not take into account that the storage device system can be flexibly adapted to the configuration change.

  This is because when a storage device system composed of a single component is changed to a component of a plurality of storage device systems, when the management information needs to be moved, the storage system is stopped. There is a problem that the disk storage device cannot be accessed from the host. In particular, this increases the scale of the system and becomes a big barrier such as version upgrade of a system that requires constant operation.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to easily change the configuration of a storage device system, which combines components of a plurality of storage device systems to provide a single storage device. Even in the case of the device system, the storage device system is logically managed as a single storage device system, and the storage location of management information is selected according to the configuration of the storage device system. It is an object of the present invention to provide a storage system that centrally manages management information and does not degrade access performance even with a simple configuration.

  It is another object of the present invention to provide a method for configuring a storage device system that allows a host to access a disk storage device without stopping the operation of the storage device system even when the configuration of the storage device system is changed.

  In order to achieve the above object, a configuration of an invention related to a storage device system of the present invention is a storage device system for accessing a disk storage device from a host computer. The storage device system includes a storage control device, a disk storage device, The storage control device has a channel interface connected to the host computer, a disk interface connected to the disk storage device, and a management information memory for storing management information of the storage device system. When there are a plurality of storage control devices, the management information memory included in them is connected by a management information memory switch having a management information memory module, and the storage control device is one. In the case, the management information memory is managed with a management information memory controller. Information management module, the management information memory comprises a management information memory controller, and the management information memory controller comprises a single storage control device. In some cases, the management information memory module in the storage control device is accessed, and when there are a plurality of storage control devices, the management information memory module in the management information memory switch is accessed. It is intended to work.

  More specifically, when the storage control device is one unit, the storage device system management information is stored in the management information memory module in the storage control unit, and the storage control unit includes a plurality of storage control units. In this case, the information is stored in the management information memory module in the management information memory switch.

  In order to achieve the above object, a configuration of a storage device system according to the present invention is a storage device system configuration method for accessing a disk storage device from a host computer. A storage device, a channel interface connected to the host computer, a disk interface connected to the disk storage device, and management information for the storage device system. When the storage control device is a single unit, the management information memory includes a management information memory controller and a management information memory module, and the storage control device includes a plurality of storage control devices. The management information memory from the management information memory controller Ri, connected by the management information memory switch said management information memory, in which then place a management information memory module in the management information memory switch.

  More specifically, in the configuration method of the storage device system, the storage device system management information is stored in the management information memory module in the storage control device when the storage control device is a single unit. When there are a plurality of storage control devices, they are stored in the management information memory module in the management information memory switch.

  In order to achieve the above object, in the configuration method of the storage device system of the present invention, the configuration of the invention in which a storage control device is added is that the management information includes a management information memory in the storage control device, and the management information memory Each switch is stored redundantly, and the management information memories in the multiple storage control devices are connected when the number of storage control devices constituting this system is increased from one to multiple. In each of the redundant management information systems, the management information memory and the management information memory switch are connected to each other, and one of the redundant management information systems is blocked. Copy the management information of the management information system that is not blocked to the management information memory switch of the management information system that is blocked, and then release the blocking information The management information storage location is changed from the management information memory in the storage control device to the management information memory switch by executing the above-mentioned procedure in order for each of the duplicated management information systems. In this storage system, the access to the disk storage device from the host computer during the change of the management information storage location is processed using the management information of the management information that is not blocked. Is.

  In order to achieve the above object, in the configuration method of the storage device system of the present invention, the configuration of the invention for removing the storage control device is that the management information includes a management information memory in the storage control device, and the management information memory. When the management information memory and the management information memory switch are connected to each other in each of the redundant management information systems, the system is stored in the switch. When removing the storage control devices constituting the system from a plurality of units, one of the redundant management information systems is blocked, and the management information of the management information system that is not blocked is blocked. The procedure of copying to the management information memory of the management information system and then releasing the blockage is executed in order for each of the redundant management information systems. As a result, the storage location of management information is changed from the management information memory switch to the management information memory in the storage control device, and the storage device system changes the storage location of the management information in the host computer. Is used to process access to the disk storage device from the management information of the management information that is not blocked.

  In order to achieve the above object, in the configuration method of the storage device system of the present invention, another configuration of the invention for adding a storage control device is to add a storage control device constituting this system from one to a plurality of units. A management information memory switch for connecting management information memories in the plurality of storage control devices, and connecting the management information memory in the storage control device and the management information memory switch to the management information memory. The stored management information is copied to the management information memory switch, and the storage location of the management information is changed from the management information memory in the storage control device to the management information memory switch. The device system stores the access from the host computer to the disk storage device during the change of the management information storage location as the copy source. It is obtained so as to process using the management information stored in the management information memory in the control device.

  In order to achieve the above object, in the configuration method of the storage device system of the present invention, another configuration of the invention for removing the storage control device is a management information memory switch for connecting management information memories in the plurality of storage control devices. When the storage control device constituting this system is removed from a plurality of units, the management information stored in the management information memory switch is stored in the storage control device. The management information storage location is changed from the management information memory switch to the management information memory in the storage control device, and the storage system stores the management information storage location. The management information stored in the management information memory switch that is the copy source is the access to the disk storage device from the host computer that is being changed. It is obtained as treatment with.

  According to the present invention, even when the configuration of a storage device system can be easily changed and components of a plurality of storage device systems are combined into a single storage device system, the storage device system is logically changed. By managing as a single storage device system and selecting the storage location of management information according to the configuration of the storage device system, the management information is centrally managed in any configuration, It is possible to provide a storage system that does not degrade the access performance.

  Further, according to the present invention, there is provided a storage device system configuration method capable of accessing a disk storage device from a host without stopping the operation of the storage device system even when the configuration of the storage device system is changed. Can be provided.

  Embodiments according to the present invention will be described below with reference to FIGS.

Embodiment 1
A first embodiment according to the present invention will be described below with reference to FIGS.
(I) Configuration of Storage Device System First, the configuration of the storage device system according to the first embodiment of the present invention will be described using FIG. 1 and FIG.
FIG. 1 is a configuration diagram in the case where there is one storage control device configuring the storage device system according to the first embodiment of the present invention.
FIG. 2 is a configuration diagram in the case where there are a plurality of storage control devices constituting the storage device system according to the first embodiment of the present invention.

  In the storage device system shown in FIG. 1, there is one storage control device 3 to which a host computer 1 is connected. In addition, a disk storage device 4 and a maintenance terminal 5 are connected to the storage control device 3. The disk storage device 4 is composed of a large-capacity hard disk device. The maintenance terminal 5 is a terminal for giving an instruction to the storage control device 3 and displaying an internal state.

  The storage control device 3 includes a channel interface 31, a disk interface 35, a management information memory 32, and a cache memory 33. Each part of the storage control device 3 is duplexed to improve reliability, and each part is connected by a path.

  The channel interface 31 is a part connected to the host computer 1. The disk interface 35 is a part connected to the disk storage device 4. The management information memory 32 is a nonvolatile memory and stores management information necessary for system control.

  The cache memory 33 is a memory for temporarily storing data in order to improve performance when accessing the disk storage device 4 from the host computer 1.

  The channel interface 31 includes a management information copy process 341 for copying the contents of the management information from the other normal management information memory 32 when one management information memory 32 is restored. However, the management information copy process 341 may be placed in the disk interface 35.

  The management information memory 32 includes a storage control device management information memory module 321 for storing management information, and a storage control device management information memory controller 322 for controlling the storage control device management information memory module 321.

  The management information memory module 321 in the storage controller is a memory module for storing management information of the storage system 2.

  Further, the storage control device management information memory controller 322 has a controller operation state 342, a management information memory state 344, and a copied management information address 343.

  The controller operation state 342 is information for managing an access destination when executing read / write of management information. The management information memory state 344 is information indicating the state of the management information memory 32. The copied management information address 343 is used by the management information copy process 341 to manage the progress of the management information copy.

  The cache memory 33 includes a cache memory module 331 that stores data and a cache memory controller 332 that controls the cache memory module 331.

  In the storage device system shown in FIG. 2, the storage control device 3 has a plurality of units, which is an upgrade of the storage device system of FIG. A disk storage device 4 and a maintenance terminal 3 are connected to each storage control device 3.

  The configuration of the storage control device 3 and the function of each part are the same as in the example shown in FIG. Further, each part is duplicated and connected by a path, which is the same as the example shown in FIG.

  When the storage control device 3 has a plurality of units, the storage control device 3 has a cache memory switch 7 and a management information memory switch 6 outside the storage control device 3, and the cache memory 33 and the management information memory of each storage control device 3. 32 is switching-connected.

  The cache memory switch 7 has a cache memory switch controller 71 therein and is connected to the cache memory controller 332 in the cache memory 33 of the storage control device 3.

  The management information memory switch 6 includes a management information memory switch controller 61, a management information memory module 62 in the switch, and a management information memory controller 63 in the switch. The storage control device internal management information memory controller 322 is connected.

  The intra-switch management information memory module 62 is a memory module for storing management information.

  The intra-switch management information memory controller 63 is a part that controls the intra-switch management information memory module 62 and has a management information memory state 345 therein. The management information memory state 345 is information indicating the state of management information placed in the switch. The management information memory state 344 of the storage control device management information memory controller 322 of each storage control device 3 and its state value are always set. Managed to match.

  Further, since the management information memory 32 and the cache memory 33 are duplicated, two management information memory switches 6 and two cache memory switches 7 are required for connecting them.

  The relationship between the configuration of the storage system 2 and the management information mounting site is as follows.

  That is, when there is one storage control device 3 constituting the storage device system 2, the management information is stored in the storage control device management information memory module in the management information memory 32 of the storage control device 3 shown in FIG. 321 stores the result. This is because the management information memory switch 6 and the cache memory switch 7 are unnecessary when the number of the storage control devices 3 is one, and the cost of the storage device system is reduced by not mounting them.

On the other hand, when there are a plurality of storage control devices 3 constituting the storage device system 2, they are stored in the in-switch management information memory module 62 of the management information memory switch 6 shown in FIG. This is to ensure access performance to management information. In this case, the storage control device management information memory module 321 of each storage control device 3 is unnecessary.
(II) Procedure for Changing Configuration of Storage Device System Next, the procedure for changing the configuration of the storage device system according to the present embodiment will be specifically described with reference to FIGS.
FIG. 3 is a flowchart showing a procedure for adding the storage control device 3 and the disk storage device 4 constituting the storage device system 2 according to the first embodiment of the present invention.
FIG. 4 is a flowchart showing a procedure for removing the storage control device 3 and the disk storage device 4 constituting the storage device system 2 according to the first embodiment of the present invention.

  First, the procedure for adding the storage control device 3 and the disk storage device 4 constituting the storage device system 2 will be described with reference to FIG.

  First, it is determined whether or not the existing storage control device 3 constituting the storage device system 2 is one (S301).

  If not, go to S306.

  If there is one, the management information memory switch 6 and the cache memory switch 7 are prepared and connected to the existing storage control device 3 (S302). In this case, it is necessary to newly install these switches.

  Next, the memory capacity required for storing the management information stored in the storage control device management information memory module 321 of the existing storage control device 3 in the switch management information memory module 62 of the management information memory switch 6 It is determined whether there is any (S303).

  If there is a necessary memory capacity, go to S305.

  If the required memory capacity is not available, the in-switch management information memory module 62 is expanded to a capacity sufficient to store the management information stored in the storage control apparatus management information memory module 321 (S304).

  Next, the management information is copied from the in-storage management information memory module 321 of the storage control device 3 to the in-switch management information memory module 62 of the management information memory switch 6 (S305). The copy procedure will be described in detail later with reference to FIGS.

  Next, the additional disk storage device 4 is connected to the additional storage control device 3, and the additional storage control device 3 is connected to the management information memory switch 6 and the cache memory switch 7 (S306).

  Next, it is determined whether the intra-switch management information memory module 62 of the management information memory switch 6 has a memory capacity necessary for adding the disk storage device 4 and the storage control device 3 (S307).

  If there is a necessary memory capacity, go to S309.

  If the necessary memory capacity is not available, the in-switch management information memory module 62 is expanded to a capacity sufficient to increase the disk storage device 4 and the storage control device 3 (S308).

  Next, management information for using the disk storage device 4 to be added and the storage control device 3 to be added is expanded in the intra-switch management information memory module 62 (S309). This procedure is executed in the same manner as adding a disk storage device, channel interface, and disk interface in the conventional storage control system.

  Finally, use of the added disk storage device 4 and the added storage control device 3 is started (S310).

  Next, a procedure for removing the storage control device 3 and the disk storage device 4 constituting the storage device system 2 will be described with reference to FIG.

  First, use of the disk storage device 4 to be removed and the storage control device 3 to be removed is stopped (S401).

  Next, in the in-switch management information memory module 62, the management information necessary for using the disk storage device 4 to be removed and the storage control device 3 to be removed is deleted (S402). This procedure is executed in the same manner as the deletion of the storage device, channel interface, and disk interface in the conventional storage control device system.

  Next, it is determined whether the intra-switch management information memory module 62 of the management information memory switch 6 has a reduced memory capacity by removing the disk storage device 4 and the storage control device 3 (S403).

  If there is no memory capacity to decrease, the process goes to S405.

  If there is a memory capacity to decrease, the in-switch management information memory module 62 is removed by the capacity that decreases due to the removal of the disk storage device 4 and the storage control device 3 (S404).

  Next, the connection between the storage control device 3 to be removed, the management information memory switch 6 and the cache memory switch 7 is released (S405).

  Next, as a result of the removal, it is determined whether there is one storage control device 3 constituting the storage device system 2 (S406).

  If not, the removal procedure is complete.

  In the case of a single unit, the management information stored in the in-switch management information memory module 62 of the existing management information memory switch 6 is stored in the in-storage management information management memory module 321 of the storage control device 3 that remains in the system. It is determined whether there is a memory capacity necessary for storage (S407). In this case, the management information is transferred from the management information memory switch 6 to the management information memory 32 in the storage controller.

  If there is a necessary memory capacity, go to S409.

  If the necessary memory capacity is not available, the storage control device management information memory module 321 is expanded to a capacity sufficient to store the management information stored in the switch management information memory module 62 (S408).

  Next, the management information is copied from the intra-switch management information memory module 62 of the management information memory switch 6 to the intra-storage control device management information memory module 321 of the storage control device 3 that remains in the system (S409). The copy procedure will be described in detail later with reference to FIGS.

Finally, the connection between the storage control device 3 left in the system, the management information memory switch 6 and the cache memory switch 7 is released (S410).
(III) Management Information Copy Processing and Management Information Access Processing Details Next, detailed procedures of management information copy processing and management information access processing will be described with reference to FIGS.
FIG. 5 is a flowchart showing a procedure for copying management information when the storage control device 3 and the disk storage device 4 constituting the storage device system 2 are added / removed.
FIG. 6 is a flowchart showing the management information copy process 341 executed in the channel interface 31.
FIG. 7 is a flowchart showing a procedure for accessing management information from the channel interface 31 and the disk interface 35 other than the management information copy process 341.

  Here, before explaining the details of the procedure related to management information, a preliminary concept and points to be noted will be explained.

  In this embodiment, in order to ensure reliability, each part in the storage control device 3, the channel interface 31, the disk interface 35, the management information memory 32, and the cache memory 33 are all duplicated. The cache memory switch 6 and the management information memory switch 7 are also duplexed correspondingly.

  Therefore, the management information copy processing must be performed for each of them, and since it is duplicated, even when one of the management information cannot be referred to, when the other system can be referred to, Note that it is not necessary to stop the operation of the storage control device 3. However, when processing for writing management information occurs during copying, attention must be paid to data consistency.

  Next, the management information memory state is for controlling the management information copy process and other access processes, and has three types of states: “normal”, “blocked”, and “copying”. “Normal” means that it can be used with reference to the management information in the management information memory. “Blocked” means that the management information in the management information memory cannot be referred to. “Copying” means that the management information is being copied to the management information memory.

  In this embodiment, all management information is duplicated for simplicity, but the scope of the present invention is not limited even if it is not duplicated. Management information that does not need to stop the operation of the storage control device 3 even if it cannot be referred to / updated does not need to be the target of the management information copy process 341, and the management information memory states 344 and 345 are “blocked”. If the management information memory states 344 and 345 are “normal”, the reference / update is not possible, and the management information memory states 344 and 345 are reconfigured before “normal”. What is necessary is just to control so that it may become.

  The management information memory state is possessed by both the management information memory controller 342 in the storage control device in the storage control device 3 and the management information memory controller in the switch in the management information memory switch 6, but this is the same system. In some cases, a rule is set to match both values.

  Next, the controller operation state 342 in the storage control device management information memory controller 342 in the storage control device 3 indicates the location of the management information accessed by each system of the storage control device 3. When the value is “in-switch management information access”, the management information in the management information memory switch 6 is accessed. When this value is “in-storage control unit management information access”, the management information in the storage control unit 3 is accessed. This means that the management information in the memory switch is accessed.

  When copying the management information, first, the management information memory states 344 and 345 of one of the duplexed systems are set to “blocked” from the maintenance terminal 5 (S501). At this time, it should be noted that the management information memory states 344 and 345 of both the storage control device 3 and the management information memory switch 6 are “blocked”.

  By setting the management information memory state to “blocked”, reference / update of management information from the channel interface 31 and the disk interface 35 is suppressed.

  Even if the management information memory states 344 and 345 of one of the duplexed systems are “blocked”, the storage system 2 can manage the management information memory module 321 in the storage controller of the other duplexed system or The operation can be continued using the management information stored in the management information memory module 62 in the switch.

  Next, it is determined whether the copy direction of the management information is from the storage control device 3 to the management information memory switch 6 (S502).

  When the copy direction of the management information is from the storage control device 3 to the management information memory switch 6, it is a time when the storage control device 3 is increased from one to a plurality of units and the management information memory switch 6 is added. Conversely, when the copy direction of the management information is from the management information memory switch 6 to the storage control device 3, it is when the storage control device 3 is reduced from a plurality of units to one and the management information memory switch 6 is removed.

  When the copy direction of the management information is from the storage control device 3 to the management information memory switch 6, the management information memory module 321 in the storage control device that is blocked from the maintenance terminal 5 or the management information memory in the switch The controller operating state 342 of the storage control device management information memory controller 322 used when referring to / updating the module 62 is changed from “storage control device management information access” to “switch management information access” (S503). . As a result, the management information memory controller 322 in the storage control device executes a subsequent access request to the management information for the management information in the switch.

  Conversely, when the copy direction of the management information is the direction from the management information memory switch 6 to the storage control device 3, the storage control device internal management information memory module 321 or the intra-switch management information that is blocked from the maintenance terminal 5 is used. The controller operation state 342 of the storage controller management information memory controller 322 used when referring to / updating the memory module 62 is changed from “switch management information access” to “storage controller management information access” (S504). ). As a result, the management information memory controller 322 in the storage control device makes a subsequent access request to the management information to the management information in the storage control device.

  Next, the management information memory states 344 and 345 that have been blocked are set as being copied from the maintenance terminal 5, and the management information copy process 341 is started (S505). Details of the management information copy process 341 will be described with reference to FIG.

  Next, the process waits for the management information copy process 341 to end (S506).

  Next, it is confirmed from the maintenance terminal 5 that the management information memory states 344 and 345 that are being copied are normal (S507).

  At this time, the management information is duplicated in a state in which it is stored in the duplicated in-storage management information memory module 321 in the other storage system in the other storage management device memory module 62 in the other system. It will be.

  Next, the management information memory states 344 and 345 of the other duplicated system are set to “blocked” (S508), and the same processing as before is executed (S509 to S514). Is managed in the storage controller management information memory module 321, from the switch management information memory module 62 in a duplicated state, or in the switch management information memory module 62 is duplicated in the storage controller management information memory module 321. The information memory module 321 is shifted to a duplex state.

  Next, a detailed procedure of the management information copy process 341 will be described with reference to FIG.

  The management information copy process 341 is a process called in S505 and S512 of FIG. 5, but can also be used for a similar case of recovering the management information memory 32.

  In the management information copy process 341, first, the copied management information address 343 is set at the head of the management information copy destination (S601).

  Next, it is determined whether the copied management information address 343 is the end of the management information copy destination (S602).

  If it is the end, the management information memory states 344 and 345 being copied are made normal (S606), and the management information copy process 341 is terminated.

  If it is not the terminal, a certain amount of management information is read from the management information memory module 321 in the storage control device or the management information memory module 62 in the switch on the side where the management information memory state 344 as the copy source is normal, Is written to the management information memory module 62 in the switch or the management information memory module 321 in the storage controller (S603).

  Next, the copied management information address 343 is added by the amount of the copied management information (S604).

  Next, the management information copy process 341 is interrupted for a certain period of time in order to reduce a decrease in processing performance in response to a read / write request from the host executing the management information copy process 341 (S605). Then, after a predetermined time has elapsed, the process returns to S602.

  Next, an access procedure to management information other than the management information copy process 341 in the channel interface 31 and the disk interface 35 will be described with reference to FIG.

  In this processing, it is important that the consistency of data being copied is not lost when management information is written.

  First, the management information memory states 344 of both systems are referred to (S701), and it is determined whether the management information memory states 344 of both systems are normal (S702).

  At this time, it should be noted that the controller operating state 342 of the storage control device management information memory controller 322 determines whether to access the storage control device management information memory module 321 or the switch management information memory module 62. .

  If the management information memory states 344 and 345 of both systems are normal, the management information of both systems is accessed (S703).

  If one management information memory state 344 is not normal, it is determined whether the management information memory state 344 which is not normal is “copying” (S704).

  If it is not “copying”, the management information memory state 344 accesses normal management information (S705).

  If “copied”, the copied management information address 343 is referred to (S706), and it is determined whether the access request is a write and the access destination address is at the head of the copied management information address 343 (S707).

  If the condition is not satisfied, go to S705. In this case, even when data is read or data is written, it is only necessary to write the data to the copy source.

If the condition is satisfied, write is executed for both pieces of management information (S708). This is for maintaining the identity of the duplicated management information at the end of the management information copy process 341. That is, the writing at this time is also performed on the copy destination. The write executed for the management information “copying” is executed for the copy destination according to the value set in the controller operation state 342.
(IV) Data Flow and Processing Overview of Management Information Copy Processing Next, a data flow and processing overview of management information copy processing according to the present embodiment will be described with reference to FIGS. 8 and 9.
FIG. 8 is a schematic diagram showing the data flow of the management information copy process and the outline of the process according to the first embodiment of the present invention. The management information is stored in the storage control device management information memory of the storage control device 3. FIG. 10 is a diagram when copying from the module 321 to the intra-switch management information memory module 6 in the management information memory switch 6.
FIG. 9 is a schematic diagram showing the data flow and processing outline of the management information copy process according to the first embodiment of the present invention. The management information is stored in the management information memory in the switch in the management information memory switch 6. FIG. 10 is a diagram when copying from the module 6 to the storage control device management information memory module 321 of the storage control device 3;

  FIG. 8 shows when the management information is copied from the storage control device management information memory module 321 of the storage control device 3 to the switch management information memory module 62 of the management information memory switch 6. This is an operation performed when the storage control device 3 is newly expanded from one to a plurality of units and when the management information memory switch 6 is expanded.

  Since each part of the storage control device is duplicated, this is represented as A system and B system in FIG. The storage control device 3 is written in the upper row, and the management information memory switch 6 is in the lower row. The storage control device 3 is provided with an in-storage control device management information memory module 321, and the management information memory switch 6 is provided with an in-switch management information memory module 62. Then, the management information memory state is written next to it, and the values of the respective controller operation states are written outside the box.

  Since FIG. 8 is a diagram showing an outline of the data flow and processing, unnecessary components are not described. In the following, the management information in the storage control device management information memory module 321 of the storage control device 3 is simply expressed as “there is management information in the storage control device 3” and is stored in the management information memory switch 6. The management information in the switch management information memory module 62 is simply expressed as “the management information memory switch 6 has management information”.

  First, in FIG. 8A in the initial state, both the A-system and B-system management information are in the storage control device 3, and the management information memory states are both “normal”. The management information memory state of the storage control device 3 with the same system and the management information memory switch 6 always match. The controller operating state is “in-storage device management information access”. In this state, the storage control device 3 operates by accessing the management information in the storage control device 3.

  When copying is attempted, as shown in FIG. 8B, first, the A-system management information memory state is set to “block” (S501 in FIG. 5). As a result, the A-system management information is not used by the storage control device 3.

  Next, the controller operating state of the A system is changed to “in-switch management information access” (S503 in FIG. 5), the management information memory state of the A system is set to “copying”, and copy processing is started (FIG. 5). 5 S505). The copy source is the B-system storage control device 3 because the B-system controller operating state is “management information access in storage device” and the B-system management information memory status is “normal”. The copy destination is the A-system management information memory switch 6 because the A-system controller operating state is "in-switch management information access" and the A-system management information memory state is "copying" (S603 in FIG. 6). .

  When copying is completed, as shown in FIG. 8C, the A-system management information memory state is set to “normal” (S606 in FIG. 6), and the B-system management information memory state is set to “blocked” (FIG. 8). 5 S508). Then, the B system controller operating state is changed to “in-switch management information access” (S510 in FIG. 5), the B system management information memory state is set to “copying”, and the copy process is performed again. Start (S512 in FIG. 5). The copy source is the A-system management information memory switch 6 because the A-system controller operating state is “in-switch management information access” and the A-system management information memory state is “normal”. The copy destination is the B-system management information memory switch 6 because the B-system controller operating state is “in-switch management information access” and the B-system management information memory state is “copying” (S603 in FIG. 6). .

  When the second copy process is completed, as shown in FIG. 8D, the B-system management information memory state is set to “normal” (S606 in FIG. 6). In the state shown in FIG. 8D, the storage control device 3 can operate by accessing the management information in the management information memory switch 6 in a duplexed state.

  Next, FIG. 9 shows when the management information is copied from the intra-switch management information memory module 62 in the management information memory switch 6 to the intra-storage control device management information memory module 321 of the storage control device 3. This operation is performed when the storage control device 3 is changed from a plurality of units to one unit and the management information memory switch 6 is removed.

  First, in FIG. 9A in the initial state, both the A-system and B-system management information are in the management information memory switch 6, and the management information memory states are both “normal”. The management information memory state is consistent with that of the storage control device 3 and the management information memory switch 6 in the same system as in the above example. The controller operating state is “in-switch management information access”. In this state, the storage control device 3 operates by accessing the management information in the management information memory switch 6.

  When copying, as shown in FIG. 9B, first, the A-system management information memory state is set to “block” (S501 in FIG. 5). As a result, the A-system management information is not used by the storage control device 3.

  Next, the A-system controller operation state is changed to “in-storage control device management information access” (S504 in FIG. 5), the A-system management information memory state is set to “copying”, and the copy process is started. (S505 in FIG. 5). The copy source is the B-system management information memory switch 6 because the B-system controller operating state is “in-switch management information access” and the B-system management information memory state is “normal”. The copy destination is the A-system storage control device 3 because the A-system controller operation state is "management information access in storage control device" and the A-system management information memory status is "copying" (S603 in FIG. 6). ).

  When copying is completed, as shown in FIG. 9C, the A-system management information memory state is set to “normal” (S606 in FIG. 6), and the B-system management information memory state is set to “blocked” (FIG. 9). 5 S508). Next, the controller operation state of the B system is changed to “in-storage control device management information access” (S511 in FIG. 5), the management information memory state of the B system is changed to “copying”, and copying is performed again. The process is started (S512 in FIG. 5). The copy source is the A-system storage control device 3 because the operation status of the A-system controller is “management information access in storage control device” and the management information memory status of the A-system is “normal”. The copy destination is the B-system storage control device 3 because the B-system controller operating status is “management information access in storage control device” and the B-system management information memory status is “copying” (S603 in FIG. 6). ).

  When the second copy process is completed, as shown in FIG. 9D, the B-system management information memory state is set to “normal” (S606 in FIG. 6). In the state shown in FIG. 9D, the storage control device 3 can operate by accessing the management information in the storage control device 3 in a duplexed state.

[Embodiment 2]
Hereinafter, a second embodiment according to the present invention will be described with reference to FIGS.

In this embodiment, the description of the same part as the first embodiment is omitted, and the technical difference will be mainly described.
(I) Configuration of Storage Device System First, the configuration of the storage device system according to the second embodiment of the present invention will be described with reference to FIGS. 10 and 11.
FIG. 10 is a configuration diagram in the case where one storage control device is included in the storage device system according to the second embodiment of the present invention.
FIG. 11 is a configuration diagram in the case where there are a plurality of storage control devices constituting the storage device system according to the second embodiment of the present invention.

  In the first embodiment of the present invention, when the management information of the storage device system 2 is copied between the storage control device 3 and the management information memory switch 6, each part of the storage control device 3 is duplicated. As a premise, the management information of one system is blocked and copy processing is performed. That is, in order to operate the storage device system without stopping even during copying, the redundancy that each part of the storage control device 3 is duplicated is essential.

  In the present embodiment, the storage device system can be operated without being stopped even during copying, without necessarily assuming that each part of the storage control device 3 is duplicated.

  As shown in FIG. 10, in a storage device system having one storage control device of this embodiment, the difference from the configuration of the first embodiment shown in FIG. The management information copy information 347 is provided instead of the management information memory state 344. The management information copy information 347 is information indicating the copy direction and its operation state, and clears “storage device system → management information memory switch: copying” and “management information memory switch → storage device system: copying”. It has three kinds of values. When the value is clear, it means that copying is not performed.

  As shown in FIG. 11, in the storage device system having a plurality of storage control devices of this embodiment, the difference from the configuration of the first embodiment shown in FIG. The management information copy process 346 has management information copy information 347, and the management information memory switch 6 has management information copy information 348. The management information copy information 348 is always set to the same value as the management information copy information 347.

In the examples of FIGS. 10 and 11, as in the first embodiment, each part of the storage control device 3 is described as being duplicated. However, in order to perform copy processing, it is not necessarily duplicated. There is no need to be.
(II) Procedure for Changing Configuration of Storage Device System The procedure for changing the configuration of the storage device system of this embodiment is the same as that described with reference to FIGS. 3 and 4 in the first embodiment.

That is, the procedure for adding the storage control device 3 and the disk storage device 4 constituting the storage device system 2 is as shown in FIG. 3, and the storage control device 3 and the disk storage device 4 constituting the storage device system 2 are The procedure for the expansion will be described with reference to FIG.
(III) Management Information Copy Processing and Management Information Access Processing Details Next, detailed procedures of management information copy processing and management information access processing will be described with reference to FIGS.
FIG. 12 is a flowchart showing a procedure for copying management information when adding / removing the storage control device 3 and the disk storage device 4 constituting the storage device system 2.
FIG. 13 is a flowchart showing management information copy processing 346 executed in the storage control device 3.
FIG. 14 is a flowchart showing a procedure for accessing management information from the channel interface 31 and the disk interface 35 other than the management information copy process 346.

  First, when copying the management information, as shown in FIG. 12, the management terminal copy process 346 is started by designating the copy direction from the maintenance terminal 5 to the management information memory controller 323 in the storage control device. (S1001). That is, when adding the management information memory switch 6, copying from the storage control device 3 to the management information memory switch 6, and removing the management information memory switch 6 from the management information memory switch 6 to the storage control device 3. To copy to.

  Then, it waits for the end of the management information copy process 346 of the management information memory controller 323 in the storage controller (S1002).

  Next, the management information copy process 346 will be described with reference to FIG.

  First, the copied management information address 343 is set at the head of the management information copy destination (S1101).

  Next, it is determined whether the copy direction of the management information is from the storage control device 3 to the management information memory switch 6 (S1102).

  When the copy direction of the management information is from the storage control device 3 to the management information memory switch 6, the management information copy information 348 of the management information memory switch 6 is set to “storage control device → management information switch: copying” Further, the management information copy information 347 of the storage control device 3 is similarly set to “storage control device → management information switch: copying” (S1104).

  Conversely, when the copy direction of the management information is from the management information memory switch 6 to the storage control device 3, the management information copy information 348 of the management information memory switch 6 is changed to “management information switch → storage control device: copying in progress”. In addition, the management information copy information 347 of the storage control device 3 is similarly set to “management information switch → storage control device: copying in progress” (S1106).

  Next, it is determined whether the copied management information address 343 is the end of the management information copy destination (S1107).

  If it is the end, go to S1111.

  If it is not the termination, a certain amount of management information is read from the management information memory module 321 in the storage control device serving as the copy source or the management information memory module 62 in the switch, and the management information memory module 62 in the switch serving as the copy destination, Alternatively, the information is written into the storage control device management information memory module 321 (S1108).

  Next, the copied management information address 343 is added by the amount of the copied management information (S1109).

  Next, the management information copy process 346 is interrupted for a certain period of time so as not to wait for a long time for access requests from the channel interface 31 and the disk interface 35 (S1110). After a certain time has passed, the process proceeds to S1107.

  When copying is completed, the management information copy information 347 of the storage control device 3 is cleared (S1111). Further, the management information copy information 348 of the management information memory switch 6 is cleared (S1112).

  Next, it is determined again whether or not the copy direction of the management information is from the storage control device 3 to the management information memory switch 6 (S1113).

  When the copy direction of the management information is the direction from the storage control device 3 to the management information memory switch 6, the controller operating state 342 is changed from "management information access within the storage control device" to "management information access within the switch" ( S1114).

  When the copy direction of the management information is the direction from the management information memory switch 6 to the storage control device 3, the controller operating state 342 is changed from “in-switch management information access” to “storage control device management information access” ( S1115).

  The controller operation state 342 indicates that the management information is accessed by the storage control device 3 or the management information switch 6. Therefore, access to the management information after copying is always performed on the management information on the copy destination side.

  Next, FIG. 14 is a flowchart showing a procedure for accessing management information from the channel interface 31 and the disk interface 35 other than the management information copy process 346.

  First, it is determined whether or not the controller operation state 342 is “in-storage control device management information access” (S1201).

When the controller operation state 342 is “management information access within storage control device”, an access request is executed for the management information in the storage control device management information memory module 321 (S1202).
When the controller operating state 342 is “intra-switch management information access”, an access request is executed for the management information in the intra-switch management information memory module 62 via the management information memory switch 6 (S1203).

  Next, it is determined whether the management information copy information 347 is a clear value (S1204).

  If it is a clear value, the processing of the access request is terminated. This means that when the management information copy information 347 is a clear value, the copy process is not performed, and only the normal process is required.

  If it is not a clear value, it means that it is currently being copied. In this case, the access destination is the copy source. At this time, the copied management information address 343 is referred to (S1205), and it is determined whether or not the access request is a write and the access destination address is at the head of the copied management information address 343 (S1206). When the access destination address is at the head of the copied management information address 343, it means that the access is to an area where copying has already been completed. This is because the copy process is performed from the head of the address toward the back address.

  If the condition is not satisfied, the access request processing is terminated. In this case, it means that even if the access request is a read request or a write request, it is a write request to a point in an area where copying has not yet been completed. In this case, data is simply written to the copy source.

  If the condition is satisfied, it is determined whether or not the controller operation state 342 is “in-storage control device management information access” (S1207).

  If the controller operation state 342 is “in-storage control device management information access”, the management information of the in-switch management information memory module 62 is also written through the management information memory switch 6 (S1208).

  When the controller operation state 342 is “in-switch management information access”, the management information of the storage control device management information memory module 321 is also written (S1209).

  In other words, if this condition is met, the access area is the area that has been copied at the time of writing, so the data is also written to the copy destination and the management information is consistent when the copying process is completed. This is to keep the sex.

It is a block diagram in case the storage control apparatus which comprises the storage device system which concerns on 1st embodiment of this invention is one unit. It is a block diagram in case the storage control apparatus which comprises the storage system which concerns on 1st embodiment of this invention is multiple units | sets. It is a flowchart which shows the procedure at the time of adding the storage control apparatus 3 and the disk storage apparatus 4 which comprise the storage device system 2 which concerns on 1st embodiment of this invention. It is a flowchart which shows the procedure at the time of removing the storage control apparatus 3 and the disk storage apparatus 4 which comprise the storage device system 2 which concerns on 1st embodiment of this invention. 4 is a flowchart showing a procedure for copying management information when adding / removing the storage control device 3 and the disk storage device 4 constituting the storage device system 2; 10 is a flowchart showing management information copy processing 341 executed in the channel interface 31. 10 is a flowchart showing a procedure for accessing management information from the channel interface 31 and the disk interface 35 other than the management information copy process 341. FIG. 4 is a schematic diagram showing a data flow and an outline of processing of management information copy processing according to the first embodiment of the present invention, in which management information is stored in the storage control device management information memory module 321 of the storage control device 3; 6 is a diagram when copying to the management information memory module 6 in the switch within the management information memory switch 6. FIG. FIG. 3 is a schematic diagram showing a data flow and an outline of processing of management information copy processing according to the first embodiment of the present invention, and stores management information from an in-switch management information memory module 6 in the management information memory switch 6; 4 is a diagram when copying to a storage control device management information memory module 321 of the control device 3. FIG. It is a block diagram in case the storage control apparatus which comprises the storage device system which concerns on 2nd embodiment of this invention is one unit. It is a block diagram in case the storage control apparatus which comprises the storage device system which concerns on 2nd embodiment of this invention is multiple units | sets. 4 is a flowchart showing a procedure for copying management information when adding / removing the storage control device 3 and the disk storage device 4 constituting the storage device system 2; 4 is a flowchart showing management information copy processing 346 executed in the storage control device 3. 10 is a flowchart showing a procedure for accessing management information from the channel interface 31 and the disk interface 35 other than the management information copy process 346.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Host computer 2 ... Storage device system 3 ... Storage control device 31 ... Channel interface 341, 346 ... Management information copy process 35 ... Disk interface 33 ... Cache memory 32 ... Management information memory 321 ... Storage control device management information memory module 322 323... Storage control device management information memory controller 342. Controller operation state 343... Copied management information address 344 and 345... Management information memory state 347 and 348. Management information memory switch 62: In-switch management information memory modules 63, 64: In-switch management information memory controller 7: Cache memory switch.

Claims (2)

In a storage system ,
A storage controller;
Comprising a disk storage device, a
Each of the plurality of storage control devices
A channel interface connected to the host computer,
A disk interface connected to the disk storage device;
Anda management information memory management information of the storage system is stored,
Each of the management information memories of the plurality of storage control devices is connected by a management information memory switch having a management information memory module,
The management information memory switch is
A management information memory module;
A management information memory controller;
The storage controller is
Copying the management information from the management information memory to the management information memory module;
When the disk device is accessed from the host computer during copying of the management information, processing is performed using the management information stored in the management information memory of the storage control device that is the copy source,
The storage controller is
When copying of the management information is completed, the management information is set to be accessed to the copy destination management information memory module;
The management information memory controller is
A storage system that performs processing using the management information stored in the management information memory module that is a copy destination when the host computer accesses the disk device . In a control method of a storage system,
The storage device system includes:
A storage controller;
A disk storage device,
Each of the plurality of storage control devices
A channel interface connected to the host computer;
A disk interface connected to the disk storage device;
A management information memory in which management information of the storage system is stored;
Each of the management information memories of the plurality of storage control devices is connected by a management information memory switch having a management information memory module,
The management information memory switch is
A management information memory module;
A management information memory controller;
The storage control device copying the management information from the management information memory to the management information memory module;
When the storage control device is accessed from the host computer to the disk device during copying of the management information, the storage control device uses the management information stored in the management information memory of the storage control device that is the copy source. And steps to
Setting the storage control device to access the management information to the copy destination management information memory module when copying of the management information is completed;
The management information memory controller, when accessing the disk device from the host computer, processing using the management information stored in the management information memory module, which is a copy destination, Storage system control method.

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