JP2004272349A - Data processing system, control method for data processing system, external storage device, and control method for external storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize the parallel operations of a plurality of input/output processing to the same logical volume of an external storage device. <P>SOLUTION: In a frame used by the serial channel interface of an input/output channel part(CH) and a disk controller(DKC), the CH assigns an OX-ID510 to a frame header 502 of the frame based on unique parallel access identification information for managing the parallel operations of a plurality of I/O to the VOL of the same VOL address, and transmits it to the DKC. In the DKC which has received the frame, a management information area is assigned for each I/O processing from the VOL address and the parallel access identification information based on the OX-ID510 so that the parallel access identification information can be recorded, and the CH is informed of the end by using the OX-ID510 assigned based on the parallel access identification information so that the parallel processing of the plurality of I/O to the same VOL can be realized. Thus, the parallel operations of the plurality of I/O to the same logical volume or logical peripheral equipment or the like is realized between a central processing unit and peripheral equipment such as an external storage device without being constrained by a physical storage device configuring the peripheral equipment such as the external storage device, the number of the peripheral equipment, or any available address or the like. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a control technology of a data processing system and an external storage device, and is particularly effective when applied to a control technology of data input / output between a central processing unit of a mainframe system and peripheral devices such as an external storage device. Technology.
[0002]
[Prior art]
The channel unit of the central processing unit in the mainframe data processing system processes an I / O such as a data transfer (READ / WRITE) request to the magnetic disk controller. The transmission / reception of a frame determined by the serial channel interface is performed.
[0003]
In this case, even if the central processing unit issues a plurality of I / O processing requests for the same VOL, the control is controlled so that the channel unit does not simultaneously detect and simultaneously transmit and receive frames for the plurality of I / O processing.
[0004]
For this reason, among the plurality of I / O processes requested by the central processing unit, I / O processes that cannot be processed are in a waiting state in the channel unit, causing a waiting time, which is one of the causes of performance degradation of the entire system. Has become.
[0005]
In order to make it possible to perform a plurality of I / O processes for the same VOL in parallel, Japanese Patent Application Laid-Open No. H11-163873 discloses a data processing system including a central processing unit and a disk control unit. When queuing management is performed by a unit, I / O processing is normally assigned to a data structure called UCB in VOL units. However, when this UCB is not used in VOL units, but when UCB in VOL units cannot be used, it is used as an I / O processing unit. By selecting a free UCB that is allocated and used as another VOL and assigning it to the I / O processing, even if a processing request is for the same VOL, a plurality of UCBs are allocated and used, so that a plurality of UCBs are used. It proposes realizing simultaneous processing of I / O processing.
[0006]
Also, the plurality of I / O processes assigned to the plurality of UCBs are notified to the magnetic disk control device using a special frame called binding command (BIND ADDRESS) in order to use another VOL number other than the actual VOL number. Then, it is possible to issue I / O to an actual VOL and a virtual VOL at the same time, and propose a parallel processing of a plurality of I / O processes.
[0007]
[Patent Document 1]
U.S. Pat. No. 5,530,897
[0008]
[Problems to be solved by the invention]
In Patent Document 1, in order to process I / O processing assigned to a plurality of UCBs to a plurality of VOLs, a binding command frame is notified to a magnetic disk control device to implement a plurality of I / O processes. If the VOL corresponding to the temporary VOL address to be duplicated is actually under the control of the magnetic disk controller, the VOL cannot be used. Therefore, the temporary VOL address to be duplicated is usually not mounted by the magnetic disk controller. VOL address is used.
[0009]
As a result, the number of VOLs mounted in a control unit (hereinafter, referred to as a CU) managed by the magnetic disk controller may limit the temporary VOL address, and may not always be able to implement a plurality of I / O processes. .
[0010]
Further, since a binding command frame is required, useless access occurs. Further, the magnetic disk control device recognizes the combination of the original VOL and the bound virtual VOL by the binding command frame. If the data does not match, the data may be destroyed.
[0011]
An object of the present invention is to provide a peripheral device such as a central processing unit and an external storage device without being limited by the number of physical storage devices and peripheral devices constituting a peripheral device such as an external storage device and available addresses. It is an object of the present invention to provide a technology capable of realizing a plurality of input / output parallel operations for the same logical volume, logical peripheral device, and the like.
[0012]
Another object of the present invention is to provide a central processing unit and peripheral devices such as an external storage device without causing unnecessary access by issuing a special extra frame and without adding new information to the frame itself. It is an object of the present invention to provide a technology capable of realizing a plurality of input / output parallel operations for the same logical volume, logical peripheral device, and the like.
[0013]
Another object of the present invention is to provide the same logical volume without causing a data failure between a central processing unit and peripheral devices such as an external storage device due to inconsistency in recognition of logical volumes and logical peripheral devices. It is an object of the present invention to provide a technology capable of realizing a parallel operation of a plurality of inputs / outputs to and from a logical peripheral device.
[0014]
It is another object of the present invention to provide a technique capable of improving data input / output performance between a central processing unit and peripheral devices such as an external storage device.
[0015]
[Means for Solving the Problems]
The present invention provides a central processing unit having an input / output channel unit for controlling input / output of information to / from an external device, an external storage device including a storage control device and a storage device, an input / output channel unit, and a storage control device. And a frame using a protocol for multiplexing and transmitting information between the input / output channel unit and the storage control device via the channel interface, and the storage control device A data processing system capable of accepting access from a central processing unit in units of logical volumes or logical devices logically set by a frame, wherein the frame specifies any logical volume or logical device to be accessed First identification information and input / output channels for the logical volume or the logical device; Assigned based on second identification information indicating the parallel operation of a plurality of access from pole tip, it is obtained by a structure comprising a third identification information specified in the protocol.
[0016]
More specifically, as an example, I / O used in a serial channel interface between a central processing unit having an input / output channel unit (hereinafter, referred to as a channel unit) for controlling data transfer and a magnetic disk controller is multiplexed and transmitted and received. In a frame using a protocol that performs the above operation, a logical device (hereinafter, referred to as a VOL) managed by the central processing unit and the magnetic disk controller controls a parallel operation of a plurality of I / Os separately from the VOL address. It is assigned based on access identification information (hereinafter referred to as identification information), adds an exchange identifier defined in a protocol, transfers a frame from the channel unit, and instructs a parallel operation of a plurality of I / Os to the same VOL. .
[0017]
Further, in order to enable a plurality of I / Os to be performed in parallel on the same VOL in the magnetic disk control device by the identification information based on the exchange identifier, management of I / O processing units for each VOL in the magnetic disk control device is performed. The information areas are allocated by the number of parallel operations, and the individual identification information is stored. When the I / O processing is completed, the information is allocated from the magnetic disk control device to the channel unit based on the identification information corresponding to the I / O processing. The end report is added with the exchange identifier.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0019]
FIG. 1 is a conceptual diagram showing a configuration example of a mainframe computer system which is an example of a data processing system that executes a control method of the data processing system according to an embodiment of the present invention.
[0020]
The mainframe computer system according to the present embodiment includes a CPU 101 serving as a central processing unit, a disk control unit (DKC) 102, a disk drive unit (DKU) 103, and one or more cables connecting the CPU 101 and the DKC 102. 104, and one or a plurality of cables 105 for coupling between the DKC 102 and the DKU 103.
[0021]
An access request from the CPU 101 to the DKU 103 via the DKC 102 is executed by exchanging a frame 500 illustrated in FIG. 5 described below between the CPU 101 and the DKC 102.
[0022]
The configuration in the CPU 101 includes an arithmetic processing unit (IP) 111 for executing an operating system and the like, a main storage unit (MS) 112 for storing the program and data processed by the program, and an external input / output device. An input / output channel unit (CH) 113 for controlling data transfer to and from the input / output device and a system controller unit (SC) 114 for controlling data transfer between these units.
[0023]
In the DKC 102, for example, a channel port (PORT) 121 for controlling an interface with the input / output channel unit 113 of the CPU 101, a cache memory unit (CACHE) 122 for high-speed data processing, and data in the DKC 102 are managed. And a shared memory (SM) 125 for storing control information for controlling I / O and managing data, and the like. . Further, the DKU 103 has a plurality of disk devices 131 for storing data.
[0024]
In the DKU 103, a plurality of logical disk devices (logical volumes) (VOL) are logically constructed on a plurality of disk devices 131. When the CPU 101 accesses the DKU 103 via the DKC 102, the logical volume (VOL) is designated. And executed.
[0025]
FIG. 2 is a conceptual diagram showing a configuration example of control information generated in the MS 112 to issue a plurality of I / Os to the subordinate DKC 102 in the CPU 101 of the mainframe computer system of the present embodiment.
[0026]
In the MS 112, a UCB (201, 202, 203, 204) for managing a VOL management address and the like, and a free UCB for managing a free UCB that is used at the time of executing a plurality of I / O processes and is currently unallocated. A queue 205, an IOQ 206 created for managing input / output requests when the input / output channel unit 113 executes I / O processing, an IOSB 207 for passing channel program information and the like to the input / output channel unit 113, an I / O processing From a channel program 208 for executing the program.
[0027]
As the types of UCB, there are a UCB 203, 204 for parallel access and a free UCB 252, 253, 254 for realizing a plurality of I / O processes with respect to the basic UCB 201, 202 existing for each VOL. The structures of the basic UCBs 201 and 202, the UCBs 203 and 204 for parallel access, and the free UCBs 252 to 254 are the same. Note that FIG. 2 shows a basic UCB 201 of VOL address A and a basic UCB 202 of VOL address B. VOL address A shows a state in which two UCBs for parallel access (UCBs 203 and 204 for parallel access) are connected. I have.
[0028]
Hereinafter, the structure of the UCB based on the basic UCB 201 will be described.
[0029]
In the UCB, a VOL address 211, a UCB attribute flag 212 indicating the type of the UCB (basic UCB, UCB for parallel access, free UCB), an IOQ address 213 of the IOQ 206 created for each input / output request by the input / output channel unit 113, It comprises a UCB management flag 214 for managing I / O to a VOL, a next UCB address 215 connected to the concurrent access UCB 203, concurrent access identification information 216, and a basic UCB address 217 returning to the basic UCB 201 of the VOL.
[0030]
In the free UCB queue 205, unallocated free UCBs 252, 253 and 254 are connected in a queue structure from a free UCB head pointer 251. The free UCB is a state in which the concurrent access UCB has not been allocated, and the structures of the parallel access UCB and the free UCB are, of course, the same. The pointer for connecting the free UCB in a queue structure uses the next UCB address in the UCB.
[0031]
The IOQ 206 has an IOSB address 261. The IOSB address 261 is set when a usable UCB is allocated. The IOSB 207 stores the channel program address 273 and the UCB address 272 of the UCB to be used. The channel program 208 includes a channel command word (CCW) 281 for implementing I / O processing.
[0032]
FIG. 3 is a conceptual diagram showing a configuration example of control information set in the SM 125 for realizing parallel processing of a plurality of I / Os at the time of I / O reception by the DKC 102 of the mainframe computer system of the present embodiment. is there.
[0033]
In the SM 125, LDCBs 301 and 302 for managing VOL addresses and configuration information in VOL units, JCBs (303, 304, 305) for managing operations in I / O processing units for each VOL, and unused JCBs 362 to 364 are managed. There is a free JCB queue 306 to be executed.
[0034]
The LDCBs 301 and 302 include a VOL address 311, a JCB management flag 312 for managing the JCB connected to the LDCB, a JCB pointer address 313 to the basic JCBs 303 and 305, and configuration information 314 for storing information on the configuration state of the VOL. .
[0035]
As the types of JCB, basic JCBs 303 and 305 which are always connected to LDCBs 301 and 302, JCB 304 for concurrent access used to implement parallel processing of a plurality of I / Os for each VOL, and parallel in an unallocated state Free JCBs 362, 363, and 364 connected to the free JCB queue 306 exist as access JCBs. All types of JCB have the same structure.
[0036]
Hereinafter, the structure of the JCB will be described based on the basic JCB 303. The JCB includes a next JCB pointer address 331 for connecting to the JCB for concurrent access, a JCB attribute flag 332 for indicating the type of JCB, concurrent access identification information 333 used during concurrent operation, and I / O reception by the disk controller 102. Sometimes, an I / O processing area 334 for storing information in the frame 500 and securing information necessary for I / O processing, and an LDCB pointer address 335 for storing a pointer address to the LDCB managing the VOL. .
[0037]
The unassigned free JCBs 362, 363, and 364 are connected to the free JCB queue 306 in a queue structure from a JCB pointer 361 that points to the head of the free JCB.
[0038]
FIG. 5 is a conceptual diagram showing an example of a frame structure in a serial channel interface between the input / output channel unit 113 and the disk control device 102 of the mainframe computer system of the present embodiment, and FIG. FIG. 7 is a configuration diagram showing an example of a frame header constituting a frame in a computer system, FIG. 7 is a configuration diagram showing an example of an SB2 header constituting a frame in a mainframe computer system of the present embodiment, and FIG. FIG. 9 is a configuration diagram showing an example of an IU header constituting a frame in the mainframe computer system of the embodiment, and FIG. 9 is a configuration diagram showing an example of a device information block constituting a frame in the mainframe computer system of the present embodiment. .
[0039]
The frame 500 shown in FIG. 5 is a FC-SB3 (FIBER CHANNEL SINGLE-BYTE COMMAND) based on a protocol for multiplexing I / O, FC-PH (FIBER CHANNEL PHYSICAL AND SIGNALING INTERFACE (FC-PH) REV4.3). CODE SETS-3 MAPPING PROTOCOL (FC-SB-3) REV1.3) indicates a frame, and includes an SOF 501 including information indicating the head of the frame, a Frame Header (frame header) 502, and an SB2 Header (SB2 header). ) 503, IU Header (UI header) 504, DIB (Device Information Block: device information block) 505, end of frame It consists EOF506 which includes information indicating.
[0040]
A Frame Header (frame header) 502 shown in FIG. 6 is a header used for controlling link operation and control device protocol transfer, and S-ID / D-ID / SEQ-ID / SEQ-CNT are individual frames. Is used to uniquely determine The OX-ID 510, which is an exchange identifier, is a 2-byte field for identifying an exchange ID (EX-ID) defined by FC-PH.
[0041]
The SB2 Header (SB2 header) shown in FIG. 7 is a header that supplies address designation information necessary for identifying a logical path of an exchange and an I / O device, and is a VOL address such as DEV ADR 520, CH Image, and CU Image. Is included.
[0042]
An IU Header (UI header) 504 illustrated in FIG. 8 is a header that supplies information necessary for associating a control flag with an IU to a specific CCW, and includes an information unit identifier (IUI), a DH Flag, and a CCW Number. You. The information unit identifier (IUI) is used to identify the DIB 505. The CCW Number is indicated by a model dependent 16 bit binary number assigned by the channel to the CCW associated with the IU to be transmitted.
[0043]
The DIB shown in FIG. 9 includes a DIB Header (DIB header) in which information on the CCW is stored, LRC, and DIB Data (DIB data field) for some DIB types. The DIB type is identified by the IUI in the IU header 504.
[0044]
In the present embodiment, when a frame is transferred from the input / output channel unit 113 or the disk control device 102, the OX-ID area of the Frame Header (frame header) 502 is set to the parallel access identification information 216, 226, 236, 246. The OX-ID is used as an area for storing information based on the VOL, and the I / O channel unit 113 and the disk controller 102 realize parallel processing of a plurality of I / Os for the same VOL.
[0045]
FIG. 4 is a flowchart showing an example of I / O processing from when the CPU 101 selects a basic UCB or a UCB for parallel access in the MS 112, generates a frame 500, and transfers the frame 500 to the DKC 102.
[0046]
For example, upon detecting an I / O processing request for the VOL with the VOL address = “A” (step 401), the input / output channel unit 113 acquires the IOQ 206 (step 402) and extracts the UCB from the UCB address 272 specified in the IOSB 207. It is specified (step 403). The UCB determines whether the basic UCB 201 can be used (that is, there is currently no input / output processing for the target VOL) (step 404). If the basic UCB 201 is unused, the UCB management flag 214 indicates that the basic UCB is being used. State (Step 410), set the IOQ address 213 in the basic UCB 201 (Step 416), set the IOSB address 261 in the IOQ 206 (Step 417), and identify the VOL address 211 set in the basic UCB 201 and the parallel access. The information 216 is obtained (step 418), the channel program 208 is obtained from the channel program address 273 stored in the IOSB 207, the CCW 281 is fetched from the channel program 208 (step 419), and the VOL address 241 is accessed in parallel. A new outbound OX-ID is assigned based on the network identification information 246, designated as the OX-ID 510 of the Frame Header (frame header) 502 in the frame 500, and the captured CCW 281 is executed (step 420). The frame is transmitted to the disk controller 102 by the conventional logic (step 421).
[0047]
If the basic UCB 201 is unavailable (that is, if there is an input / output process currently being executed for the target VOL), the free UCB queue 205 is searched for free UCBs 252 to 254 (step 405). If there are UCBs 252 to 254, the UCB is fetched from the free UCB queue 205 (step 406), the VOL address of the basic UCB 201 to be connected is stored in the VOL address of the obtained free UCB (step 407), and the obtained UCB (for example, parallel access) The base UCB address is set to the base UCB address 247 of the base UCB 204 (step 408), the UCB attribute flag 242 of the acquired UCB is set to the UCB for parallel access (step 409), and the UCB management flag 214 in the base UCB 201 is set. ,common The vacant number of the access identification information 216 is selected and set in the concurrent access identification information 246 of the acquired UCB (step 413), the next UCB address 215 is traced from the basic UCB 201, and the next UCB of the last UCB (concurrent access UCB 203). The obtained UCB address is set to the address 235 (step 414), the used UCB is set to the UCB management flag 214 in the basic UCB 201 (step 415), the IOQ address 243 in the UCB is set (step 416), and the IOQ 206 is set. The IOSB address 261 is set (step 417), the VOL address 241 set in the UCB (the acquired concurrent access UCB 204) and the concurrent access identification information 246 are acquired (step 418), and stored in the IOSB 207. Channel Pro The channel program 208 is obtained from the RAM address 273, the CCW 281 is fetched from the channel program 208 (step 419), and the OX-ID of the outbound is newly assigned based on the VOL address 241 and the parallel access identification information 246. By specifying the OX-ID 510 of the Header (frame header) 502 and executing the fetched CCW 281 (step 420), the frame 500 is transmitted to the disk controller 102 by the conventional logic (step 421).
[0048]
If the basic UCB 201 is unavailable, the free UCB queue 205 is searched for free UCBs 252 to 254 (step 405). If there is no free UCB 252 to 254, the UCB management flag 214 is set to wait for UCB free ( Step 411), the IOQ 206 is released (step 412), and the conventional logic UCB wait state is set. If a free UCB 252 to 254 occurs or the basic UCBs 201 and 202 become unused, the I / O request always remains. Therefore, the process is immediately restarted from the acquisition of the IOQ 206 (step 402).
[0049]
FIG. 10 is a flowchart of a process performed by the disk controller (DKC) 102 of the mainframe computer system according to the present embodiment for implementing parallel processing of a plurality of I / Os upon receipt of the frame 500 and reporting completion.
[0050]
When the PORT 121 detects the reception of the initial frame of each I / O process (step 601), the control processor 123 performs the frame reception process (step 602) and acquires the VOL address 520 and the OX-ID 510 in the frame 500 (step 603). ).
[0051]
Next, based on the LDCB 301 of the VOL address (for example, VOL address = “A”), it is determined whether or not the basic JCB is usable by the JCB management flag 312 (step 604), and the basic JCB 303 is usable (that is, VOL address = “ If the VOL of A "is not currently accessed), the JCB management flag 312 is set to use the basic JCB (step 605), and the OX- of the outbound acquired from the frame 500 is set in the parallel access identification information 333 in the basic JCB 303. The parallel access identification information based on the ID 510 is set (step 606), and the frame 500 for performing the I / O processing is stored in the I / O processing area 334 (step 607). The I / O process is executed (step 608). It is determined whether the I / O processing is completed (step 609), and the reception of the related next frame (step 611) and the steps 607 and 608 are repeated until there is no related subsequent frame. 520 and the concurrent access identification information, the inbound OX-ID 510 is designated, an end report is made to the input / output channel unit 113 of the CPU 101 (step 610), and the process proceeds to the conventional logic after the end report (step 619).
[0052]
If the basic JCB 303 cannot be used in the determination in step 604 (that is, there is an I / O process currently being executed for the target VOL), it is determined whether or not there are free JCBs 362 to 364 in the free JCB queue 306 (step S 604). 612) If there is a free JCB, the JCB is taken out from the free JCB queue 306 (step 615), and the JCB attribute flag 342 of the acquired JCB (which becomes the JCB 304 for parallel access) is set in the JCB for parallel access (step 616). , The JCB pointer address 313 of the LDCB 301, the next JCB pointer address 331 of the basic JCB 303, and if there is a connected JCB, the next JCB pointer address is traced, and the next JCB pointer address of the last JCB is obtained from the free JCB queue 306. did The JCB address is set (step 617), the JCB management flag 312 is set to use JCB for concurrent access (step 618), and the OX-ID 510 of the outbound acquired from the frame 500 is set in the parallel access identification information 343 in the JCB. (Step 606), the frame 500 for performing I / O processing is stored in the I / O processing area 344 (step 607), and the frame 500 is stored in the I / O processing area 344. The requested I / O processing is executed using the frame 500 (step 608). It is determined whether the I / O processing is completed (step 609), and the reception of the related next frame (step 611) and the steps 607 and 608 are repeated until there is no related subsequent frame. 520 and the concurrent access identification information, the inbound OX-ID 510 is designated, an end report is made to the input / output channel unit 113 of the CPU 101 (step 610), and the process proceeds to the conventional logic after the end report (step 619).
[0053]
If the basic JCB 303 is unavailable, it is determined whether there are free JCBs 362 to 364 in the free JCB queue 306 (step 612). If there are no free JCBs 362 to 364, the disk control device 102 The VOL is reported to the device busy state (step 613), and the inbound OX-ID 510 based on the concurrent access identification information reported as the device busy is stored in the configuration information 314 of the LDCB 301 of the VOL (step 613). Step 614), and proceeds to the conventional logic of waiting in a device busy state (step 619).
[0054]
As described above, according to the data processing system and the control method of the present embodiment, a serial channel interface between the central processing unit 101 having the input / output channel unit 113 for controlling data transfer and the disk control unit 102 is used. In the frame 500 to be used, an exchange identifier (for example, OX-ID) 510 used in FC-PH (FIBER CHANNEL PHYSICAL AND SIGNALING INTERFACE (FC-PH) REV 4.3), which is a protocol for multiplexing I / O, is used. In this area, information based on concurrent access identification information for managing concurrent operations of a plurality of I / Os is stored separately from the VOL address 520, thereby instructing the disk control device 102 to input / output requests, In device 102, I A management information area such as an LDCB or JCB is allocated in the SM 125 for each O processing unit, and the parallel access identification information based on the OX-ID 510 is stored in the management information area. , The I / O channel unit 113 adds the parallel access identification information and reports the completion, thereby realizing a plurality of I / O processes for the same VOL (logical volume) in the DKU 103 from the I / O channel unit 113. Becomes possible.
[0055]
This eliminates the need to issue an extra command (frame) for notifying the disk control device 102 that a specific VOL address is linked to a temporary VOL address for the purpose of realizing parallel access to the same VOL, for example. Useless access due to issuance of a simple frame does not occur.
[0056]
In addition, since a plurality of input / output processes for a specific VOL are performed only by changing the OX-ID 510 based on the parallel access identification information using the same VOL address, it is not necessary to secure a temporary address or the like. The upper limit of the VOL address managed by the disk control device 102 and the restriction of the parallel access due to the number of the disk devices 131 do not occur, and the parallel access can be reliably realized.
[0057]
Further, since the VOL-address 520 and the OX-ID 510 based on the parallel access identification information are commonly used in both the input / output channel unit 113 and the disk control device 102, for example, the correspondence between the original VOL address and the temporary VOL address However, there is no concern that the I / O channel unit 113 and the disk control device 102 recognize the differently, and it is possible to prevent a failure such as data destruction due to an incorrect VOL access.
[0058]
As a result, the performance of data access to the disk device 131 via the input / output channel unit 113 and the disk control device 102 is improved, and the performance of the entire mainframe computer system is improved.
[0059]
Also, FC-SB3 (FIBER CHANNEL SINGLE-BYTE COMMAND CODE SETS-3 MAPPING PROTOCOL (FC-SB-3) REV1.3) conforming to FC-PH (Fibre Channel protocol) which is a protocol for multiplexing I / O. The information of the exchange identifier (OX-ID) 510 for identifying the exchange (EX-ID) in the frame 500 specified in Parallel access to the same VOL can be realized without changing information.
[0060]
The invention described in the claims of the present application is expressed as follows from a different viewpoint.
[0061]
<1> In a frame using a protocol for multiplexing and transmitting and receiving I / O used in a serial channel interface between a central processing unit having an input / output channel unit for controlling data transfer and a disk control unit, the central processing unit At the time of I / O for a device and a logical volume managed by the disk control device, the I / O is assigned based on concurrent access identification information for managing concurrent operations of a plurality of I / Os, separately from the logical volume address, and is defined in the protocol. A data processing system comprising means for adding an exchange identifier to the frame, transferring the frame from the input / output channel unit to the disk controller, and instructing a parallel operation of a plurality of I / Os to the same logical volume.
[0062]
<2> In the data processing system according to item <1>, in order to enable a parallel operation of a plurality of I / Os to the same logical volume in the disk control device by the parallel access identification information based on the exchange identifier, In the control device, the management information area of the I / O processing unit for each logical volume is allocated by the number of parallel operations, and the parallel access identification information based on the corresponding exchange identifier is stored. When the individual I / O processing ends, A data processing system comprising: means for adding an exchange identifier based on the concurrent access identification information to the input / output channel unit from the disk control device and reporting the completion of the exchange.
[0063]
<3> In a frame using a protocol for multiplexing and transmitting I / O used in a serial channel interface between a higher-level device and a disk controller, I / O to a logical volume managed by the upper-level device and the disk controller. At the time, the frame is assigned based on the parallel access identification information for managing the parallel operations of a plurality of I / Os separately from the logical volume address, and the exchange identifier specified in the protocol is added to the frame and transferred to the frame. I / O processing for each logical volume in the disk control device to enable parallel operation of a plurality of I / Os to the same logical volume in the disk control device based on the parallel access identification information based on the exchange identifier. Unit management information area The parallel access identification information is allocated by the number of the parallel operations, and the parallel access identification information based on the corresponding exchange identifier is stored. When the individual I / O processing is completed, the disk control device sends the parallel access identification information to the host device. An external storage device having means for adding an exchange identifier based on the information and reporting the completion.
[0064]
Although the invention made by the present inventor has been specifically described based on the embodiment, the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the invention. Needless to say.
[0065]
【The invention's effect】
According to the present invention, peripheral devices such as a central processing unit and an external storage device can be used without being limited by the number of physical storage devices and peripheral devices constituting a peripheral device such as an external storage device, available addresses, and the like. Between them, it is possible to achieve a plurality of input / output parallel operations for the same logical volume, logical peripheral device, and the like.
[0066]
According to the present invention, between the central processing unit and a peripheral device such as an external storage device, without causing unnecessary access by issuing a special extra frame and without adding new information to the frame itself. Thus, an effect is obtained that a plurality of inputs and outputs can be performed in parallel with respect to the same logical volume, logical peripheral device, and the like.
[0067]
According to the present invention, the same logical volume or logical device can be used without causing a data failure between the central processing unit and peripheral devices such as an external storage device due to inconsistency in recognition of logical volumes and logical peripheral devices. The advantage is that a plurality of inputs and outputs can be performed in parallel to peripheral devices and the like.
[0068]
According to the present invention, it is possible to achieve an effect of improving data input / output performance between a central processing unit and a peripheral device such as an external storage device.
[Brief description of the drawings]
FIG. 1 is a conceptual diagram illustrating a configuration example of a mainframe computer system as an example of a data processing system that executes a control method of the data processing system according to an embodiment of the present invention.
FIG. 2 is a conceptual diagram showing an example of control information generated in an MS for issuing a plurality of I / Os to a subordinate DKC by a CPU of a mainframe computer system according to an embodiment of the present invention; is there.
FIG. 3 shows an example of control information set in an SM for realizing parallel processing of a plurality of I / Os at the time of I / O reception by a DKC of a mainframe computer system according to an embodiment of the present invention. FIG.
FIG. 4 is a flowchart illustrating an example of frame generation and transfer processing in an input / output channel unit of a mainframe computer system according to an embodiment of the present invention.
FIG. 5 is a conceptual diagram showing a configuration example of a frame in a serial channel interface between an input / output channel unit and a disk controller of a mainframe computer system according to an embodiment of the present invention.
FIG. 6 is a configuration diagram showing an example of a frame header constituting a frame in a mainframe computer system according to an embodiment of the present invention.
FIG. 7 is a configuration diagram showing an example of an SB2 header in a mainframe computer system according to an embodiment of the present invention.
FIG. 8 is a configuration diagram showing an example of an IU header constituting a frame in a mainframe computer system according to an embodiment of the present invention.
FIG. 9 is a configuration diagram illustrating an example of a device information block configuring a frame in a mainframe computer system according to an embodiment of the present invention;
FIG. 10 is a flowchart illustrating an example of parallel processing of frame reception and multiple I / O in a disk controller of a mainframe computer system according to an embodiment of the present invention.
[Explanation of symbols]
101: central processing unit (CPU), 102: disk control unit (DKC) (storage control unit), 103: disk drive unit (DKU) (storage device), 104: connection cable between CPU and DKC, 105: DKC-DKU Connection cable, 111: arithmetic processing unit (IP), 112: main storage unit (MS), 113: input / output channel unit (CH), 114: system controller unit (SC), 121: channel port (PORT), 122: Cache memory unit (CACHE), 123: Control processor, 124: Data transfer control unit, 125: Shared memory (SM), 131: Disk device, 201, 202 ... Basic UCB (first input / output management information block) , 211, 221... VOL address (first identification information), 216, 226. ., 203, 204... Concurrent access UCB (first input / output management information block), 231, 241... VOL address (first identification information), 236, 246... Parallel access identification information (second , 303, 305: basic JCB (second input / output management information block), 304: parallel access JCB (second input / output management information block), 500: frame, 501: SOF, 502: frame Header 503 SB2 header 504 IU header 505 Device information block 510 OX-ID (exchange identifier, third identification information) 520 DEV ADR (VOL address, first identification information)

Claims (5)

A central processing unit provided with an input / output channel unit for controlling input / output of information to / from the outside, an external storage device including a storage control device and a storage device, and connecting the input / output channel unit and the storage control device And a frame using a protocol for multiplexing and transmitting the information between the input / output channel unit and the storage controller via the channel interface,
The storage control device is a data processing system capable of accepting access from the central processing unit in units of logical volumes or logical devices logically set for the storage device,
The frame includes first identification information for specifying any of the logical volumes or logical devices to be accessed, and a second for instructing a parallel operation of a plurality of accesses to the logical volume or logical device from the input / output channel unit. And a third identification information assigned based on the identification information and the third identification information defined in the protocol. The data processing system according to claim 1,
The input / output channel unit includes, for each of a plurality of access requests to the same logical volume or logical device, a plurality of first requests including common first identification information and different second identification information from each other. An input / output management information block is dynamically generated, and the third identification assigned to each of the first input / output management information blocks based on the first identification information and the second identification information Executing the individual access request by generating the frame including information and issuing the frame to the storage controller,
The storage control device may control the same logical unit for each combination of the first identification information and the second identification information based on the third identification information included in the frame coming from the input / output channel unit. A plurality of second input / output management information blocks for accessing a volume or a logical device in parallel are generated, and a response to the input / output channel unit in response to the access request includes a corresponding first identification information and A data processing system using the frame including the third identification information allocated based on the second identification information. By transmitting and receiving a frame using a protocol for multiplexing and transmitting information between a central processing unit and a peripheral device constituting a plurality of logical peripheral devices, a communication between the central processing unit and the peripheral device is performed. A method for controlling a data processing system for inputting and outputting data, comprising:
The frame is allocated based on first identification information that specifies each of the logical peripheral devices and second identification information that specifies a parallel operation of a plurality of I / O requests to the logical peripheral device, and is assigned to the protocol. Specified third identification information,
The central processing unit includes, for each of a plurality of I / O requests for the same logical peripheral device, a plurality of first I / Os including a common first identification information and a different second identification information from each other. A management information block is dynamically generated, and for each of the first input / output management information blocks, the third identification information assigned based on the first identification information and the second identification information is determined. Execute the individual input / output requests by generating the frame including and issuing the frame to the peripheral device,
The same logical peripheral device is used for each combination of the first identification information and the second identification information based on the third identification information included in the frame coming from the central processing unit. Generating a plurality of second input / output management information blocks for executing a plurality of inputs / outputs in parallel with respect to the first identification information corresponding to the response to the central processing unit in response to the input / output request And using the frame including the third identification information assigned based on the second identification information. A storage control device and a storage device, wherein the storage control device transmits and receives information to and from a higher-level device via a frame using a protocol for multiplexing and transmitting information, and logically communicates with the storage device. An external storage device that receives access from the higher-level device in units of a logical volume or a logical device set to
The frame includes first identification information for specifying any logical volume or logical device to be accessed, and second identification for instructing a parallel operation of a plurality of accesses to the logical volume or logical device from the higher-level device. Assigned on the basis of the information, the third identification information defined in the protocol,
The storage control device may include, for each combination of the first identification information and the second identification information based on the third identification information included in the frame coming from the higher-level device, the same logical volume or A plurality of input / output management information blocks for accessing a logical device in parallel are generated, and a response to the access request to the higher-level device is based on the corresponding first identification information and the second identification information. An external storage device, comprising: a control logic that uses the frame including the third identification information allocated by the control unit. A storage control device and a storage device, wherein the storage control device transmits and receives information to and from a higher-level device via a frame using a protocol for multiplexing and transmitting information, and logically communicates with the storage device. A method for controlling an external storage device that receives an access request from the higher-level device in units of a logical volume or a logical device set to
Based on first identification information for specifying any logical volume or logical device to be accessed, and second identification information for instructing a parallel operation of a plurality of accesses to the logical volume or logical device from the higher-level device. Receiving a frame allocated and set with third identification information defined in the protocol;
For each combination of the first identification information and the second identification information based on the third identification information included in the frame received from the higher-level device, in parallel with the same logical volume or logical device. Generating a plurality of input / output management information blocks for access; and
Responding to the access request to the upper-level device using the frame including the third identification information allocated based on the corresponding first identification information and second identification information;
A method for controlling an external storage device, comprising:

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