WO2016157421A1 - ストレージ装置及びその制御方法 - Google Patents
ストレージ装置及びその制御方法 Download PDFInfo
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- WO2016157421A1 WO2016157421A1 PCT/JP2015/060167 JP2015060167W WO2016157421A1 WO 2016157421 A1 WO2016157421 A1 WO 2016157421A1 JP 2015060167 W JP2015060167 W JP 2015060167W WO 2016157421 A1 WO2016157421 A1 WO 2016157421A1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0602—Interfaces specially adapted for storage systems specifically adapted to achieve a particular effect
- G06F3/061—Improving I/O performance
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0638—Organizing or formatting or addressing of data
- G06F3/0644—Management of space entities, e.g. partitions, extents, pools
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0655—Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices
- G06F3/0659—Command handling arrangements, e.g. command buffers, queues, command scheduling
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0628—Interfaces specially adapted for storage systems making use of a particular technique
- G06F3/0662—Virtualisation aspects
- G06F3/0665—Virtualisation aspects at area level, e.g. provisioning of virtual or logical volumes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/067—Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0683—Plurality of storage devices
- G06F3/0689—Disk arrays, e.g. RAID, JBOD
Definitions
- the present invention relates to a storage apparatus and a control method thereof, and in particular, a processing method to which an LDEV (Logical Device) ownership is applied as a processing method of an I / O (Input / Output) command is adopted, and a logical unit (LU) is used.
- LDEV Logical Device
- I / O Input / Output
- LU logical unit
- a logical unit called a command device is provided in the storage apparatus separately from the logical unit in which the upper apparatus reads / writes data, and the upper apparatus uses commands for the storage apparatus as data. Write to the command device.
- the command written in the command device is read from the command device and executed by the processor that can execute the command among the plurality of processors.
- the present invention has been made in view of the above points, and an object of the present invention is to propose a storage apparatus and its control method that can effectively prevent a decrease in response performance to an I / O command.
- a logical unit having a plurality of storage devices managing storage areas provided by the storage devices as one pool, and cutting out a part of the pool
- a storage device that associates a device with a logical unit and provides the logical unit as a storage area to a host device, a channel control unit that sends and receives commands and data to and from the host device, and a command from each host device
- a plurality of command processing units for processing the logical unit, and for each logical device, the command processing unit having ownership of the logical device is preset, and the logical unit associated with the logical device is targeted.
- the command from the host device has the ownership of the logical unit.
- the command processing unit executes and a plurality of the logical units are managed as one group, and one logical unit in the group is defined as a logical unit representing the group, and the group representing the group
- the format of the command targeting the logical unit is different from the format of the command targeting the logical unit in the group other than the logical unit, and the channel control unit is provided by the host device. If the format of the command is analyzed, and the logical unit targeted by the command is the logical unit other than the logical unit representing the logical unit in the group based on the analysis result, the command Associated with the logical unit subject to And to forward the command to the command processing unit having the ownership of the serial logic device.
- a plurality of storage devices are provided, the storage areas provided by the storage devices are managed as one pool, and a logical device obtained by cutting out a part of the pool is defined as a logical unit.
- a storage device control method for providing the logical unit as a storage area to a host device, wherein the storage device sends and receives commands and data to and from the host device, and A plurality of command processing units for processing commands from a host device, and each command processing unit having ownership of the logical device is set in advance for each logical device and associated with the logical device. The command from the higher-level device targeted for the logical unit is transferred to the logical unit.
- the command processing unit having a right is executed, a plurality of the logical units are managed as one group, and one logical unit in the group is defined as a logical unit representing the group, and the group And the command format for the logical unit in the group other than the logical unit is different from the format of the command for the logical unit representing the channel unit.
- a first step of analyzing a format of the given command; and the channel control unit, based on the analysis result, the logical unit targeted by the command is representative of the logical unit in the group If it is a logical unit other than a logical unit, And as a second step of transferring the command to the command processing unit having the ownership of the logical device associated with the logical unit to be command of the subject.
- FIG. 10 is a conceptual diagram for explaining I / O processing when I / O commands for an SLU conflict.
- reference numeral 1 denotes an information processing system according to this embodiment as a whole.
- the information processing system 1 includes a host computer 2 and first and second storage apparatuses 3A and 3B.
- the host computer 2 is a computer device provided with information processing resources such as a CPU (Central Processing Unit) and a memory, and includes, for example, a personal computer, a workstation, a main frame, and the like.
- the host computer 2 is connected to the first storage device 3A via the network 4 and transmits an I / O command such as a read command or a write command to the first storage device 3A. Data to be read / written to / from the first storage device 3A.
- I / O command such as a read command or a write command
- the first and second storage devices 3A and 3B each include one or more channel control units 10, one or more disk control units 11, a connection unit 12, a cache memory 13, and a plurality of microprocessor packages 14, One or a plurality of storage devices 15 respectively connected to the disk control unit 11 are configured.
- the channel control unit 10 is hardware that functions as an interface at the time of communication with the host computer 2 and other storage devices (second or first storage device 3B, 3A) other than the own storage device.
- the port 10A includes a microprocessor 20, a port control unit 21, a local router 22, and a buffer memory 23.
- Each port 10A is assigned a unique address such as an IP (Internet Protocol) address or a WWN (World Wide Name). Access to the first and second storage apparatuses 3A and 3B is performed by designating the address of a specific port 10A permitted by the access source.
- IP Internet Protocol
- WWN World Wide Name
- the microprocessor 20 is hardware having a function for controlling the operation of the entire channel control unit 10, and various processes as the entire channel control unit 10 are performed by executing the control program 24.
- the port control unit 21 is an interface that performs protocol control during communication with the host computer 2.
- the local router 22 is a virtual router that is implemented by the microprocessor 20 executing the control program 24, and has an I / O command transfer function for transferring the received I / O command to an appropriate microprocessor package 14. Have Details of the “appropriate microprocessor package” will be described later.
- the buffer memory 23 is used as a data buffer at the time of data transfer between the channel control unit 10 and the host computer 2. The buffer memory 23 also stores various control information 25 described later.
- the disk control unit 11 is hardware that functions as an interface to the storage device 15.
- the disk control unit 11 accesses the corresponding storage device 15 based on the I / O command from the host computer 2 given through the channel control unit 10, and is specified in the I / O command in the storage device 15. Read / write data in the storage area.
- the connection unit 12 includes, for example, an ultra high-speed cross bus switch, and all the channel control unit 10, the disk control unit 11, the cache memory 13, and the microprocessor package 14 are connected thereto. Data and various commands are exchanged between the channel control unit 10, the disk control unit 11, the cache memory 13 and the microprocessor package 14 through the connection unit 12.
- Each cache memory 13 is composed of one or more semiconductor memory elements (for example, DRAM (Dynamic Random Access Memory)).
- DRAM Dynamic Random Access Memory
- the microprocessor package 14 includes a memory controller hub 30, a local memory 31, and a plurality of microprocessors 32.
- the memory controller hub 30 is a hub that connects a plurality of microprocessors 32 to the local memory 31.
- the local memory 31 is used to hold a control program (microprogram) 33, for example.
- the microprocessor 32 is hardware having a function for controlling the operation of the entire first or second storage device 3A, 3B.
- the microprocessor 32 reads a control program (microprogram) 33 from the local memory 31 via the memory controller hub 30, and in accordance with the control program 33, a higher-level device (first device) provided via the channel control unit 10 and the connection unit 12.
- a control program microprogram
- first device a higher-level device
- the I / O command from the host computer 2 is processed
- the I / O command from the first storage device 3A is processed.
- the processing of the I / O command is executed by the microprocessor 32 having a margin capable of processing the I / O command among the plurality of microprocessors 32 at that time.
- the storage device 15 includes, for example, an expensive disk such as a SCSI (Small Computer System Interface) disk or an inexpensive disk such as a SATA (Serial AT Attachment) disk or an optical disk.
- an expensive disk such as a SCSI (Small Computer System Interface) disk or an inexpensive disk such as a SATA (Serial AT Attachment) disk or an optical disk.
- the storage areas provided by each of the one or more storage devices 15 are managed as one storage area called a pool 40, and a partial area on the pool 40 is cut out and logical devices (hereinafter referred to as LDEVs). (Referred to as Logical Device) 41.
- LDEVs logical devices
- Logical Device 41 logical devices 41.
- Each of these LDEVs 41 is associated with a logical unit 42 having the same capacity as that LDEV 41, and these logical units 42 are provided to the host computer 2 as a storage area.
- a plurality of logical units 42 assigned to the same host computer 2 are managed as a host group 43.
- Each logical unit 42 is assigned a unique identifier (LUN).
- LUN unique identifier
- Data read / write with respect to each logical unit 42 is a number unique to the logical block assigned to this LUN and a block of a predetermined size in the logical unit 42 (hereinafter referred to as a logical block).
- a combination of LBA: Logical Block Address) is used as an address, and the address is designated by an I / O command. Note that data read / write to the logical unit 42 is actually performed on the storage area associated with the address specified in the I / O command in the LDEV 41 associated with the logical unit 42. .
- the first and second storage apparatuses 3A and 3B of the present embodiment store the data written by the host computer 2 to a certain logical unit 42 in the first storage apparatus 3A.
- a replication function for replicating (duplicating) the logical unit 42 in the second storage apparatus 3B paired with the unit 42 is installed.
- the specific channel control unit 10 of the first storage device 3A and the specific channel control unit 10 of the second storage device 3B are connected via a communication path 5 such as a cable or a network. Connected.
- the first storage device 3A is a case where data is written to the logical unit 42 by the host computer 2, and the logical unit 42 is paired with any logical unit 42 in the second storage device 3B.
- the data is transferred to the second storage device 3B via the communication path 5 together with the I / O command in synchronism with or asynchronously with the write.
- the second storage device 3B that has received the data and the I / O command is paired with the logical unit 42 in the first storage device 3A to which the data has been written based on the I / O command.
- the data is written to the logical unit 42 in the storage apparatus that has been selected.
- LDEV ownership rights (2-1) Overview of LDEV Ownership Rights
- a microprocessor package 14 having the authority to process an I / O command for the LDEV 41 is set in advance.
- this authority is referred to as an LDEV owner right for the LDEV.
- This LDEV ownership is automatically set to one of the microprocessor packages 14 when there is no instruction from the outside in accordance with an instruction from the outside when the LDEV 41 is created.
- the LDEV ownership can be transferred to another microprocessor package 14 without stopping the first or second storage device 3A, 3B. Therefore, the load between the microprocessor packages 14 can be changed by appropriately transferring the LDEV owner right while monitoring the monitoring information such as the status of I / O access to the LDEV 41 and the operating rate of each processor 32 in the microprocessor package 14. Dispersion can be performed.
- the local router 22 (FIG. 1) installed in the channel control unit of the first and second storage apparatuses 3A and 3B sends the received I / O command to the above-mentioned I / O command. As described above, an I / O command transfer function for transferring to an appropriate microprocessor package 14 is provided.
- This I / O command transfer function is a first I / O command transfer function for transferring an I / O command from the host computer 2 to an appropriate microprocessor package 14 (hereinafter referred to as a host I / O command transfer function).
- a host I / O command transfer function When the data replication is performed between the first and second storage apparatuses 3A and 3B, the I / O command from the first storage apparatus 3A that is the replication source is sent to the second replication apparatus that is the replication destination.
- the storage device 3B can be divided into a second I / O command transfer function (hereinafter referred to as an inter-storage device I / O command transfer function) for transferring to an appropriate microprocessor package 14.
- the local router 22 corresponds to each port 10A (FIG. 1) of the channel control unit 10 (FIG. 1) as means for realizing the host I / O command transfer function described above.
- a host target microprocessor package search table (hereinafter referred to as a host target MPPK search table) 50 is created and managed.
- This host target MPPK search table 50 constitutes a part of the above-described control information 25 (FIG. 1) stored in the buffer memory 23 (FIG. 1) of the channel control unit 10.
- the host target MPPK search table 50 includes an SID column 50A, a LUN column 50B, and a head processor number column 50C as shown in FIG.
- the source ID is stored in the SID column 50A
- the LUN of each logical unit 42 constituting the corresponding group is stored in the LUN column 50B.
- the identification number hereinafter referred to as the identification number
- the microprocessor 32 FIG. 1
- the local router 22 When receiving the I / O command from the host computer 2, the local router 22 acquires the source ID and the LUN of the logical unit 42 from the I / O command, and acquires the acquired source ID and LUN.
- the processor number of the first microprocessor 32 of the microprocessor package 14 having the LDEV ownership of the logical unit 42 is searched on the host target MPPK search table 50 using the combination of
- the local router 22 further searches for the microprocessor package 14 corresponding to the head processor number detected by the search, and transfers the I / O command to the microprocessor package 14.
- the local router 22 is a means for realizing the above-mentioned inter-storage device I / O command transfer function, as shown in FIG.
- the inter-storage device I / O command MPPK search table) 51 is created and managed.
- This inter-storage device I / O command MPPK search table 51 constitutes a part of the above-described control information 25 (FIG. 1) stored in the buffer memory 23 (FIG. 1) of the channel controller 10 (FIG. 1). Therefore, it is used to manage the LDEV ownership of each LDEV 41 (FIG. 2) in the own storage device.
- the inter-storage device I / O command MPPK search table 51 includes an LDEV number column 51A and a first processor number column 51B as shown in FIG.
- the LDEV number column 51A stores the LDEV number of each LDEV 41 defined in the own storage device
- the head processor number column 51B stores the head of the microprocessor package 14 having the LDEV ownership of the corresponding LDEV 41.
- the processor number of the microprocessor 32 is stored.
- an I / O command transferred between the primary storage apparatus and the secondary storage apparatus may be exchanged in a vendor-unique format.
- the logical unit 42 that is the I / O target is specified by the LUN, and the LUN that is received by this I / O command is converted to an LDEV number.
- the LDEV of the access destination is specified, but in the exchange of I / O commands between the storage devices, the LDEV number of the LDEV associated with the logical unit to be I / O is used as it is from the primary storage device to the secondary side. To the storage device.
- Bit 0 is replaced with the vendor unique LUN format in which the LDEV number of the LDEV 41 associated with the logical unit is stored instead of the LUN of the logical unit to be I / O-targeted.
- the second storage device 3B that has received the I / O command from the first storage device 3A acquires the LDEV number of the target LDEV 41 from the received I / O command, and uses the acquired LDEV number as a key.
- the processor number of the first microprocessor 32 of the microprocessor package 14 having the LDEV ownership of the LDEV 41 is searched on the inter-storage device I / O command MPPK search table 51.
- the second storage device 3B searches for the microprocessor package 14 associated with the first processor number detected by this search, and transfers the I / O command to the microprocessor package 14.
- FIG. 5 shows a series of I executed in the first or second storage device 3A, 3B that has received an I / O command in relation to the LDEV ownership. The flow of / O processing is shown.
- the channel control unit 10 of the first or second storage device 3A, 3B is a host device (the host computer 2 in the case of the first storage device 3A, the first storage device in the case of the second storage device 3B).
- SP1 an I / O command is given from 3A (SP1)
- the received I / O command is analyzed by the local router 22 to identify the logical unit 42 to be I / O target.
- the local router 22 transmits the microprocessor package 14 having the LDEV ownership of the LDEV 41 (FIG. 2) associated with the specified logical unit 42 to the host target MPPK search table 50 or the I / O between storage devices as described above.
- the O command MPPK search table 51 is used to specify the I / O command to the specified microprocessor package 14 (SP2).
- the I / O command is processed by the microprocessor package 14 that has received the transfer of the I / O command (SP3).
- FIG. 6 shows that immediately after the I / O command is transferred to the microprocessor package 14, the LDEV ownership of the LDEV 41 associated with the logical unit 42 that is the I / O target in the I / O command The flow of processing when moved to the microprocessor package 14 is shown.
- the microprocessor package 14 that has received the transfer of the I / O command does not already have the LDEV ownership of the I / O target LDEV 41, the I / O command is transferred to the LDEV. Transfer to the microprocessor package 14 to which the ownership is transferred (SP12).
- the I / O command is processed by the microprocessor package 14 that has received the transfer of the I / O command (SP13).
- FIG. 7 shows the flow of processing when data replication is executed between the first and second storage apparatuses 3A and 3B.
- processing until the channel control unit 10 of the first storage device 3A that has received the I / O command from the host computer 2 transfers the I / O command to the microprocessor package 14 to be I / O ( The flow of SP20, SP21) is the same as in the case of FIG.
- the microprocessor package 14 to which the I / O command from the host computer 2 has been transferred writes data to the logical unit 42 according to the I / O command (SP22), and then the I / O command and The data is transferred to the second storage device 3B via the channel controller 10 and the communication path 5 (FIG. 1) (SP23, SP24).
- the logical unit 42 designated as the I / O target in the I / O command is the same as in the case described above with reference to FIG.
- the I / O command is transferred to the microprocessor package 14 having the LDEV ownership of the associated LDEV 41 and processed (SP25, SP26).
- the conglomerate LUN system is a management system for the logical unit 42 proposed in 4r36h of SPC (SCSI Primary Commands).
- a plurality of logical units 42 are grouped into groups called logical unit conglomerates, and one logical unit 42 in the logical unit conglomerate 60 is logically grouped.
- a logical unit 42 representative of the unit conglomerate 60 (hereinafter referred to as an ALU (Administrative Logical Unit) 42A) is defined, and other logical units 42 in the group are logical units 42 under the ALU 42A. (Hereinafter, this is referred to as SLU (Subsidiary Logical Unit) 42S) and is associated with the ALU 42A in the logical unit conglomerate 60.
- the upper device recognizes the ALU 42A as a SCSI device and the same logical unit as the SLU 42S under it. This is performed by an I / O command in the LUN format described later with reference to FIG. 12 for the ALU 42A belonging to the conglomerate 60.
- LDEV ownership can be set independently for each logical unit 42 (ALU 42A and SLU 42S) constituting the logical unit conglomerate 60. Therefore, for example, as shown in FIG. 9, the LDEV ownership of a certain microprocessor package 14 is set for a part of the logical units 42 constituting the same logical unit conglomerate 60, and the remaining logical units are set. 42, the LDEV ownership of another microprocessor package 14 can be set.
- the correspondence relationship between the ALU 42A and the SLU 42S is managed using the ALU-SLU relation table 62 shown in FIG.
- the ALU-SLU association table 62 includes the same number of ALU index columns 62A as the number of SLUs that can be set in the system.
- Each ALU index column 62A is associated with the LDEV number of the LDEV 41 associated with any SLU 42S.
- Each ALU index column 62A stores a bitmap having the same number of bits as the number of ALUs 42A that can be set in the system.
- the bit corresponding to the ALU 42A of the logical unit conglomerate 60 to which the SLU 42S corresponding to the ALU index column 62A belongs is set to “1”, and the other bits are set to “0”.
- the number of the leftmost bit of the bitmap is “0”, and the number of bits from the bit to the bit set to “1” of the bitmap is the index of the ALU 42A corresponding to the bitmap. It shall be called a number.
- the index number of the ALU 42A is assigned to the ALU 42A for convenience, and is different from the LDEV number of the LDEV 41 with which the ALU 42A is associated. Therefore, the correspondence between the index number of the ALU 42A and the LDEV number of the LDEV 41 with which the ALU 42A is associated is managed using the ALU-LDEV relation table 63 shown in FIG.
- the ALU-LDEV related table 63 includes the same number of LDEV number columns 63A as the number of ALUs that can be set in the system. Each LDEV number column 63A is associated with an index number of any ALU 42A. Each LDEV number column 63A stores the LDEV number of the LDEV 41 associated with the ALU 42A having the corresponding index number.
- the index number of the ALU 42A of the logical unit conglomerate 60 to which the SLU 42S associated with the LDEV 41 having the LDEV number “2” belongs is “1”.
- the LDEV number of the LDEV 41 associated with the ALU 42A is “0000”.
- the ALU-SLU related table 62 and the ALU-LDEV related table 63 are stored and held in the local memory 31 (FIG. 1) of the microprocessor package 14, and the microprocessor 32 is connected to the I / O. Used when processing commands.
- the host computer 2 can recognize only the ALU 42A among the logical units 42 constituting the logical unit conglomerate 60 as a SCSI device as described above, the host computer 2 can recognize the logical unit conglomerate 60.
- the ALU 42A is always designated as an I / O target by the I / O command when accessing any of the ALU 42A and the SLU 42S constituting the.
- the I / O target specified in the I / O command is the ALU 42A of the logical unit conglomerate 60 or the logical unit conglomerate 60.
- the I / O command is transferred to the ALU 42A or the microprocessor package 14 having the LDEV ownership of the normal logical unit 42.
- the microprocessor package 14 Upon receiving this I / O command, the microprocessor package 14 analyzes the received I / O command and sets the ALU 42A or the normal logical unit 42 associated with the LDEV 41 having the LDEV ownership to the I / O command. If it is the target, the I / O command is processed, and if the other microprocessor package 14 is the logical unit 42 associated with the LDEV 41 having the LDEV ownership, the I / O command is processed. The / O command is transferred to the other microprocessor package 14, and the I / O command is processed in the other microprocessor package 14.
- the microprocessor package 14 having the LDEV ownership of the LDEV 41 associated with the ALU 42A of the logical unit conglomerate 60, and the logical unit conglomerate 60 thereof When the microprocessor package 14 having the LDEV ownership of the LDEV 41 associated with the SLU 42S belonging to the SLU 42S is different (see FIG. 9), the I / O command for the SLU 42S always has the LDEV ownership of the ALU 42A. Since the microprocessor package 14 is transferred to the microprocessor package 14 having the LDEV ownership of the SLU 42S, there is a problem that the response performance to the I / O command is lowered.
- the local router 22 (FIG. 1) performs the I / O command.
- the O command is analyzed and the logical unit 42 to be I / O is the SLU 42S of the logical unit conglomerate 60, the I / O command has the LDEV ownership of the LDEV 41 associated with the SLU 42S.
- an I / O command transfer function for transferring directly to the microprocessor package 14 is implemented in the first and second storage apparatuses 3A and 3B.
- the ALU 42A is the I / O target
- the SLU 42S is The format of the field for designating the I / O target logical unit 42 (hereinafter referred to as “LUN format”) differs between the case of the I / O target and the first storage device 3A and the second storage device 3A.
- the local router 22 (FIG. 1) of the storage apparatus 3B can easily determine whether the I / O target of the I / O command is the ALU 42A or the SLU 42S based on the LUN format of the I / O command. Has been made.
- the LUN format in the I / O command that designates the ALU 42A (and the normal logical unit 42 that does not constitute the logical unit conglomerate 60) as an I / O target is shown in FIG.
- This LUN format is a format defined as a specification in the SCSI standard. In byte 0 and bits 7-6, “00b” which is a fixed value is stored as “ADDRAMETHOD”. Byte 0, bit 5 to byte 1 and bit 0 store the LUN of the logical unit that is the I / O target, and byte 2 to byte 7 store “0” as “Reserved”. .
- the LUN format shown in FIG. 12 is used as the LUN format in the I / O command that designates the SLU 42S as the I / O target.
- This LUN format is also a format defined by the SCSI standard.
- byte 0-1 the LUN of ALU 42A belonging to the same logical unit conglomerate 60 is specified in the same format as byte 0-1 in FIG.
- bit 2 to byte 7, and bit 0 are areas for designating SLU 42S, and “11b”, which is a fixed value as “ADDR METHOD”, is assigned to byte 2 and bits 7-6.
- 2 and bits 5-4 store “10b” as a fixed value as “LENGTH”, and bytes 2 and bits 3-0 store “2h” as a fixed value as “EXTENDEDENDADDRESS METHOD”, respectively.
- the LDEV number of the LDEV 41 associated with the SLU 42S is stored as identification information for specifying the SLU 42S targeted for I / O.
- the inter-storage device I / O command MPPK search table 51 since then can be used.
- the microprocessor package 14 to which the I / O command is transferred can be easily specified. In byte 7, “0” is stored as “Reserved”.
- FIG. 13 shows local routers 22 (first and second storage apparatuses 3A, 3B related to the I / O command transfer function according to this embodiment described above ( The specific processing content of FIG. 1) is shown.
- the local router 22 transfers the received I / O command to the appropriate microprocessor package 14 according to the processing procedure shown in FIG.
- the local router 22 when the local router 22 receives the I / O command, the local router 22 starts the I / O command transfer process shown in FIG. 13. First, a command descriptor block (CDB: Command Descriptor Block) of the received I / O command is obtained. Analysis is performed (SP30), and based on the analysis result, it is determined whether or not the I / O command is a SCSI command (SP31).
- CDB Command Descriptor Block
- the format of the I / O command between the first and second storage apparatuses 3A and 3B is a vendor-unique format.
- the I / O command is an I / O command transmitted from the first storage device 3A to the second storage device 3B, and the second I / O command is received. It means that the storage device 3B.
- the local router 22 uses the LDEV number obtained by the analysis in step SP30 as a key, and the processor number of the first microprocessor 32 (FIG. 1) of the microprocessor package 14 having the LDEV ownership of the LDEV 41 of the LDEV number. Are searched on the inter-storage device I / O command MPPK search table 51 (FIG. 4) (SP34).
- the local router 22 transfers the I / O command to the microprocessor package 14 detected by this search (SP36), and thereafter ends this I / O command transfer processing.
- obtaining a positive result in the determination at step SP31 means that the I / O command belongs to (A) the ALU 42A in the first storage device 3A and (B) the same logical unit conglomerate 60 as the ALU 42A. This means that this is an I / OL command that targets either the SLU 42S existing in one storage apparatus 3A and the normal logical unit 42 that does not constitute the logical unit conglomerate 60.
- the local router 22 refers to the bytes 2-7 of the LUN format of the I / O command and determines whether or not the I / O command is an I / O command that targets the SLU 42S as an I / O target. It is determined whether or not the LUN format is not the LUN format of FIG. 11 but the LUN format of FIG. 12 (SP32).
- the local router 22 When the local router 22 obtains a negative result in this determination, it acquires the LDEV number of the LDEV 41 associated with the I / O target SLU from the bytes 3-6 of the LUN format of the I / O command (SP33).
- the local router 22 uses the acquired LDEV number as a key and sets the processor number of the first microprocessor 32 of the microprocessor package 14 having the LDEV ownership of the logical unit 42 associated with the LDEV 41 of the LDEV number as the inter-storage device I
- the / O command MPPK search table 51 is searched (SP34).
- the local router 22 transfers the I / O command to the microprocessor package 14 detected by this search (SP36), and thereafter ends this I / O command transfer processing.
- the local router 22 acquires the LUN from bytes 0-1 of the LUN format of the I / O command and corresponds to the ALU 42A to which the acquired LUN is assigned.
- the processor number of the first microprocessor 32 of the microprocessor package 14 having the ownership of the attached LDEV 41 is searched on the host target MPPK search table 50 (FIG. 3) (SP35).
- the local router 22 transfers the I / O command to the microprocessor package 14 detected by this search (SP36), and thereafter ends this I / O command transfer processing.
- a plurality of ALUs 42A are associated with one SLU 42S (that is, the SLU 42S includes a plurality of logical units,
- the SLU 42S includes a plurality of logical units
- the host computers 2 share the SLU 42S, and the I / O system is connected to the SLU 42S through a plurality of paths.
- a / O command will be issued. Under such circumstances, there may occur a situation in which I / O commands from a plurality of host computers 2 for the SLU 42S compete.
- a priority management table 70 as shown in FIG. 15 is stored in the local memory 31 (FIG. 1) of each microprocessor package 14.
- the priority management table 70 is a table used for managing the priority of the ALU 42A set in advance for the corresponding SLU 42S, and is prepared for each SLU 42S.
- This priority management table 70 includes a LUN column 70A and a priority column 70B.
- the LUN column 70A is assigned to each ALU 42A existing in the first or second storage apparatus 3A, 3B.
- Each of the LUNs stored is stored, and in the priority column 70B, a value representing the priority of the ALU 42A set for each ALU 42A associated with the SLU 42S is stored in the corresponding SLU 42S.
- the priority column 70B a value representing the priority of the ALU 42A set for each ALU 42A associated with the SLU 42S is stored in the corresponding SLU 42S.
- FIG. 15 it is assumed that the smaller the priority value, the higher the priority.
- the microprocessor 32 of the microprocessor package 14 refers to the priority management table 70 corresponding to the SLU 42S and refers to the I / O command.
- An I / O command having a higher priority of the ALU 42A in which the LUN is stored in bytes 0-2 of the LUN format (FIG. 12) of the command is processed with higher priority.
- This function is equivalent to setting priorities for a plurality of host computers 2 sharing the same SLU 42S. Therefore, by installing such a function in the first storage device 3A, it becomes more important. It is possible to preferentially process an I / O command from the host computer 2 that performs an appropriate process.
- a queue 71 for each ALU 42A associated with the SLU 42S as shown in FIG. 16 is prepared on the local memory 31 (FIG. 1) of each microprocessor package 14.
- the I / O command transferred from the channel controller 10 is stored in the queue 71 of the ALU 42A corresponding to the LUN stored in bytes 0-2 of the LUN format (FIG. 12).
- the I / O commands stored in the queue 71 may be repeatedly processed in order according to the priority of the corresponding ALU 42A. Note that “number according to priority” means that more I / O commands stored in the queue 71 corresponding to the ALU 42A having higher priority are processed.
- FIG. 15 there are four ALUs 42A with LUNs “0” to “3”, and higher priorities are set in this order for the ALUs 42A with LUNs “2”, “3”, and “1”. If, for example, three I / O commands stored in the queue 71 corresponding to the ALU 42A having the highest priority “ALU2” are processed, for example, then the ALU 42A having the next highest priority “ALU3” is processed. Two I / O commands stored in the corresponding queue 71 are processed, and one I / O command stored in the queue 71 corresponding to the ALU 42A having the lowest priority “ALU1” is processed. The above processing may be repeated.
- the I / O command from the host computer 2 that performs more important processing can be processed more preferentially.
- the above method can be applied even in an environment where a single ALU 42A is defined as a path to a plurality of ports 10A as shown in FIG.
- the priority management table 70 and the queue 71 are prepared not in units of SLUs 42S but in units of ALUs 42A, and priorities between the ports 10A for each port 10A are set.
- the microprocessor package 14 as a command processing unit for processing an I / O command from a host device is configured as shown in FIG. 1 is described.
- various other configurations can be widely applied.
- the number of the microprocessors 32 (FIG. 1) included in the command processing unit may be one.
- the present invention employs a processing method to which LDEV ownership is applied as an I / O command processing method, and a storage device adopting a conglomerate LUN method as a logical unit management method, as well as similar I / O command processing.
- the present invention can be widely applied to storage apparatuses that employ both the method and the logical unit management method.
- SYMBOLS 1 Information processing system, 2 ... Host computer, 3A, 3B ... Storage apparatus, 10 ... Channel control part, 10A ... Port, 14 ... Microprocessor package, 15 ... Storage device, 20, 32 ... ... Microprocessor, 22 ... Local router, 25 ... Control information, 41 ... LDEV, 42 ... Logical unit, 42A ... ALU, 42B ... SLU, 50 ... Host target MPPK search table, 51 ... Inter-storage device I / O command MPPK search table, 60 ... Logical unit conglomerate, 62 ... ALU-SLU related table, 63 ... ALU-LDEV related table, 70 ... Priority table, 71 ... Queue .
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Abstract
Description
図1において、1は全体として本実施の形態による情報処理システムを示す。この情報処理システム1は、ホスト計算機2と、第1及び第2のストレージ装置3A,3Bとを備えて構成されている。
(2-1)LDEVオーナ権の概要
次に、LDEVオーナ権について説明する。本実施の形態の場合、第1及び第2のストレージ装置3A,3Bでは、LDEV41ごとに、そのLDEV41に対するI/Oコマンドを処理する権限を有するマイクロプロセッサパッケージ14が予め設定される。本明細書においては、この権限をそのLDEVに対するLDEVオーナ権と呼ぶものとする。このLDEVオーナ権は、LDEV41の作成時に、外部からの指示に従って、外部からの指示がない場合には自動的にいずれかのマイクロプロセッサパッケージ14に設定される。
第1及び第2のストレージ装置3A,3Bのチャネル制御部に搭載されたローカルルータ22(図1)は、受信したI/Oコマンドを上述のように適切なマイクロプロセッサパッケージ14に転送するI/Oコマンド転送機能を有する。
図5は、かかるLDEVオーナ権に関連して、I/Oコマンドを受信した第1又は第2のストレージ装置3A,3Bにおいて実行される一連のI/O処理の流れを示す。
(3-1)コングロメリットLUN(Conglomerate LUN)方式の概要
次に、コングロメリットLUN方式について説明する。コングロメリットLUN方式は、SPC(SCSI Primary Commands)の4r36hにおいて提案されている論理ユニット42の管理方式である。
ここで、上述のように各LDEV41にLDEVオーナ権が設定された第1及び第2のストレージ装置3A,3Bにおける論理ユニット42の管理方式としてこのようなコングロメリットLUN方式を適用する場合について考える。
図13は、上述した本実施の形態によるI/Oコマンド転送機能に関する第1及び第2のストレージ装置3A,3Bのローカルルータ22(図1)の具体的な処理内容を示す。ローカルルータ22は、上位装置からのI/Oコマンドを受信すると、この図13に示す処理手順従って、受信したI/Oコマンドを適切なマイクロプロセッサパッケージ14に転送する。
図14に示すように、1つのSLU42Sに対して複数のALU42Aが関連付けられており(つまりそのSLU42Sが複数のロジカル・ユニット・コングロメリット60に属しており)、各ALU42Aがそれぞれ異なるホスト計算機2に割り当てられている場合、これらのホスト計算機2がそのSLU42Sを共有している状況となり、そのSLU42Sに対して複数の経路でI/Oコマンドが発行されることになる。このような状況のもとでは、そのSLU42Sに対する複数のホスト計算機2からのI/Oコマンドが競合する事態が発生し得る。
以上のように本実施の形態による情報処理システム1では、上位装置からのI/Oコマンドが対象とする論理ユニット42がSLU42Sである場合には、その論理ユニット42と対応付けられたLDEV41のオーナ権を有するマイクロプロセッサパッケージ14にそのコマンドを直接転送するため、第1及び第2のストレージ装置3A,3B内においてマイクロプロセッサパッケージ14間でのI/Oコマンドの転送が発生するのを防止することができる。かくするにつき、かかる第1及び第2のストレージ装置3A,3B内におけるマイクロプロセッサパッケージ14間でのI/Oコマンドの転送に起因してI/Oコマンドに対する応答性能が低下するのを有効に防止することができる。
なお上述の実施の形態においては、本発明を図1のように構成された情報処理システム1に適用するようにした場合について述べたが、本発明はこれに限らず、この他種々の形態の情報処理システムに広く適用することができる。
Claims (10)
- 複数の記憶デバイスを有し、各前記記憶デバイスがそれぞれ提供する記憶領域を1つのプールとして管理し、前記プールの一部を切り出した論理デバイスを論理ユニットと対応付けて、当該論理ユニットを上位装置に記憶領域として提供するストレージ装置において、
前記上位装置との間でコマンド及びデータを送受するチャネル制御部と、
それぞれ前記上位装置からのコマンドを処理する複数のコマンド処理部と
を備え、
前記論理デバイスごとに、当該論理デバイスのオーナ権を有する前記コマンド処理部が予めそれぞれ設定され、前記論理デバイスと対応付けられた前記論理ユニットを対象とする前記上位装置からの前記コマンドを、当該論理ユニットの前記オーナ権を有する前記コマンド処理部が実行し、
複数の前記論理ユニットが1つのグループとして管理されると共に、当該グループ内の1つの前記論理ユニットが当該グループを代表する論理ユニットとして定義され、
前記グループを代表する前記論理ユニットを対象とする前記コマンドのフォーマットと、当該論理ユニット以外の当該グループ内の前記論理ユニットを対象とする前記コマンドのフォーマットとが異なり、
前記チャネル制御部は、
前記上位装置から与えられた前記コマンドのフォーマットを解析し、
解析結果に基づいて、当該コマンドが対象とする前記論理ユニットが、前記グループ内の当該論理ユニットを代表する前記論理ユニット以外の前記論理ユニットである場合には、当該コマンドの対象となる前記論理ユニットと対応付けられた前記論理デバイスの前記オーナ権を有する前記コマンド処理部に当該コマンドを転送する
ことを特徴とするストレージ装置。 - 前記グループを代表する前記論理ユニットを対象とする前記コマンドでは、対象とする前記論理ユニットが当該論理ユニットの識別子により指定され、
前記グループ内の当該グループを代表する前記論理ユニット以外の前記論理ユニットを対象とする前記コマンドでは、対象とする前記論理ユニットが属する前記グループを代表する前記論理ユニットの識別子と、対象とする前記論理ユニットと対応付けられた前記論理デバイスの識別子とが指定され、
前記チャネル制御部は、
前記論理ユニットと、当該論理ユニットと対応付けられた前記論理デバイスの前記オーナ権を有する前記コマンド処理部との対応関係が格納された第1のテーブルと、
前記論理デバイスと、当該論理デバイスの前記オーナ権を有する前記コマンド処理部との対応関係が格納された第2のテーブルとを管理し、
前記上位装置から与えられた前記コマンドのフォーマットが前記グループを代表する前記論理ユニットを対象とするフォーマットである場合には、当該コマンドで指定された前記識別子を有する前記論理ユニットと対応付けられた前記論理デバイスの前記オーナ権を有する前記コマンド処理部を前記第1のテーブル上で検索し、当該検索により検出した前記コマンド処理部に当該コマンドを転送し、
当該コマンドのフォーマットが前記グループを代表する前記論理ユニット以外の前記論理ユニットを対象とするフォーマットである場合には、当該コマンドで指定された前記識別子を有する前記論理デバイスの前記オーナ権を有する前記コマンド処理を前記第2のテーブル上で検索し、当該検索により検出した前記コマンド処理部に当該コマンドを転送する
ことを特徴とする請求項1に記載のストレージ装置。 - 前記上位装置を構成する他のストレージ装置から、対象とする前記論理ユニットと対応付けられた前記論理デバイスの識別子が指定された前記コマンドが与えられ、
前記チャネル制御部は、
前記上位装置から与えられた前記コマンドのフォーマットが前記他のストレージ装置からの前記コマンドのフォーマットである場合には、当該コマンドで指定された前記論理デバイスの前記オーナ権を有する前記コマンド処理部を前記第2のテーブル上で検索し、当該検索により検出した前記コマンド処理部に当該コマンドを転送する
ことを特徴とする請求項2に記載のストレージ装置。 - 前記グループを代表する前記論理ユニットに当該論理ユニット間での優先度が予めそれぞれ設定され、
前記コマンド処理部は、
複数の前記グループに属し、いずれの前記グループをも代表しない同一の前記論理ユニットを対象とする複数の前記コマンドが前記チャネル制御部から転送され、当該複数のコマンドが競合するときには、当該論理ユニットが属する各前記グループをそれぞれ代表する前記論理ユニットに設定された前記優先度に従った順番で前記コマンドを処理する
ことを特徴とする請求項2に記載のストレージ装置。 - 前記コマンド処理部は、
前記グループを代表する前記論理ユニット以外の前記論理ユニットごとに、当該論理ユニットが属する各前記グループをそれぞれ代表する前記論理ユニットにそれぞれ対応させたキューを有し、前記チャネル制御部から転送される前記コマンドを当該コマンドで指定された前記論理ユニットの識別子に応じた前記キューに格納し、
各前記キューに格納された前記コマンドを、各前記キューにそれぞれ対応付けられた前記グループを代表する前記論理ユニットに設定された前記優先度に応じた個数ずつ順番にかつ繰り返し処理する
ことを特徴とする請求項4に記載のストレージ装置。 - 複数の記憶デバイスを有し、各前記記憶デバイスがそれぞれ提供する記憶領域を1つのプールとして管理し、前記プールの一部を切り出した論理デバイスを論理ユニットと対応付けて、当該論理ユニットを上位装置に記憶領域として提供するストレージ装置の制御方法であって、
前記ストレージ装置は、
前記上位装置との間でコマンド及びデータを送受するチャネル制御部と、
それぞれ前記上位装置からのコマンドを処理する複数のコマンド処理部と
を有し、
前記論理デバイスごとに、当該論理デバイスのオーナ権を有する前記コマンド処理部が予めそれぞれ設定され、前記論理デバイスと対応付けられた前記論理ユニットを対象とする前記上位装置からの前記コマンドを、当該論理ユニットの前記オーナ権を有する前記コマンド処理部が実行し、
複数の前記論理ユニットが1つのグループとして管理されると共に、当該グループ内の1つの前記論理ユニットが当該グループを代表する論理ユニットとして定義され、
前記グループを代表する前記論理ユニットを対象とする前記コマンドのフォーマットと、当該論理ユニット以外の当該グループ内の前記論理ユニットを対象とする前記コマンドのフォーマットとが異なり、
前記チャネル制御部が、前記上位装置から与えられた前記コマンドのフォーマットを解析する第1のステップと、
前記チャネル制御部が、解析結果に基づいて、当該コマンドが対象とする前記論理ユニットが、前記グループ内の当該論理ユニットを代表する前記論理ユニット以外の前記論理ユニットである場合には、当該コマンドの対象となる前記論理ユニットと対応付けられた前記論理デバイスの前記オーナ権を有する前記コマンド処理部に当該コマンドを転送する第2のステップと
を備えることを特徴とするストレージ装置の制御方法。 - 前記グループを代表する前記論理ユニットを対象とする前記コマンドでは、対象とする前記論理ユニットが当該論理ユニットの識別子により指定され、
前記グループ内の当該グループを代表する前記論理ユニット以外の前記論理ユニットを対象とする前記コマンドでは、対象とする前記論理ユニットが属する前記グループを代表する前記論理ユニットの識別子と、対象とする前記論理ユニットと対応付けられた前記論理デバイスの識別子とが指定され、
前記チャネル制御部は、
前記論理ユニットと、当該論理ユニットと対応付けられた前記論理デバイスの前記オーナ権を有する前記コマンド処理部との対応関係が格納された第1のテーブルと、
前記論理デバイスと、当該論理デバイスの前記オーナ権を有する前記コマンド処理部との対応関係が格納された第2のテーブルとを管理し、
前記第2のステップにおいて、前記チャネル制御部は、
前記上位装置から与えられた前記コマンドのフォーマットが前記グループを代表する前記論理ユニットを対象とするフォーマットである場合には、当該コマンドで指定された前記識別子を有する前記論理ユニットと対応付けられた前記論理デバイスの前記オーナ権を有する前記コマンド処理部を前記第1のテーブル上で検索し、当該検索により検出した前記コマンド処理部に当該コマンドを転送する一方、
当該コマンドのフォーマットが前記グループを代表する前記論理ユニット以外の前記論理ユニットを対象とするフォーマットである場合には、当該コマンドで指定された前記識別子を有する前記論理デバイスの前記オーナ権を有する前記コマンド処理を前記第2のテーブル上で検索し、当該検索により検出した前記コマンド処理部に当該コマンドを転送する
ことを特徴とする請求項6に記載のストレージ装置の制御方法。 - 前記上位装置を構成する他のストレージ装置から、対象とする前記論理ユニットと対応付けられた前記論理デバイスの識別子が指定された前記コマンドが与えられ、
前記第2のステップにおいて、前記チャネル制御部は、
前記上位装置から与えられた前記コマンドのフォーマットが前記他のストレージ装置からの前記コマンドのフォーマットである場合には、当該コマンドで指定された前記論理デバイスの前記オーナ権を有する前記コマンド処理部を前記第2のテーブル上で検索し、当該検索により検出した前記コマンド処理部に当該コマンドを転送する
ことを特徴とする請求項7に記載のストレージ装置の制御方法。 - 前記グループを代表する前記論理ユニットに当該論理ユニット間での優先度が予めそれぞれ設定され、
前記コマンド処理部が、複数の前記グループに属し、いずれの前記グループをも代表しない同一の前記論理ユニットを対象とする複数の前記コマンドが前記チャネル制御部から転送され、当該複数のコマンドが競合するときには、当該論理ユニットが属する各前記グループをそれぞれ代表する前記論理ユニットに設定された前記優先度に従った順番で前記コマンドを処理する第3のステップを備える
ことを特徴とする請求項7に記載のストレージ装置の制御方法。 - 前記コマンド処理部は、
前記グループを代表する前記論理ユニット以外の前記論理ユニットごとに、当該論理ユニットが属する各前記グループをそれぞれ代表する前記論理ユニットにそれぞれ対応させたキューを有し、前記チャネル制御部から転送される前記コマンドを当該コマンドで指定された前記論理ユニットの識別子に応じた前記キューに格納し、
前記第3のステップにおいて、前記コマンド処理部は、
各前記キューに格納された前記コマンドを、各前記キューにそれぞれ対応付けられた前記グループを代表する前記論理ユニットに設定された前記優先度に応じた個数ずつ順番にかつ繰り返し処理する
ことを特徴とする請求項9に記載のストレージ装置の制御方法。
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JP2000092053A (ja) * | 1998-09-10 | 2000-03-31 | Fujitsu Ltd | ネットワークの被監視装置及び監視装置 |
WO2005006175A1 (ja) * | 2003-07-10 | 2005-01-20 | Fujitsu Limited | 複数の論理ユニットをグループ化する方法、受信した要求の処理方法、複数の論理ユニットをグループ化する装置及び、受信した要求の処理装置 |
JP2005209149A (ja) * | 2003-12-26 | 2005-08-04 | Hitachi Ltd | ボリュームの動的割り付け機能を有する記憶装置システム |
JP2006119970A (ja) * | 2004-10-22 | 2006-05-11 | Hitachi Ltd | ネットワークシステムにおけるエラーリカバリレベルの最適化 |
JP2006134342A (ja) * | 2005-11-17 | 2006-05-25 | Hitachi Ltd | 外部記憶装置 |
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JP2000092053A (ja) * | 1998-09-10 | 2000-03-31 | Fujitsu Ltd | ネットワークの被監視装置及び監視装置 |
WO2005006175A1 (ja) * | 2003-07-10 | 2005-01-20 | Fujitsu Limited | 複数の論理ユニットをグループ化する方法、受信した要求の処理方法、複数の論理ユニットをグループ化する装置及び、受信した要求の処理装置 |
JP2005209149A (ja) * | 2003-12-26 | 2005-08-04 | Hitachi Ltd | ボリュームの動的割り付け機能を有する記憶装置システム |
JP2006119970A (ja) * | 2004-10-22 | 2006-05-11 | Hitachi Ltd | ネットワークシステムにおけるエラーリカバリレベルの最適化 |
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