摘要:
In a data processing system in which a host processing apparatus and a storage subsystem are connected via a channel interface, the present invention makes it possible to expand the number of logical device addresses in excess of the device address limitations of the channel interface, and also enhances the performance of parallel access processing for the same logical device. When an access request is generated for a logical device, the host processing apparatus stores the logical device address to be accessed in a prefix command of a channel command word (CCW) for the access request, sets this CCW in a device information block of a frame which complies with the channel interface, sets a parallel access identifier for identifying a plurality of accesses for the same device in a device address of this frame, and then sends this frame to the storage subsystem.
摘要:
A storage system that includes: a plurality of microprocessors; a plurality of storage areas to be formed to a drive group; an assignment section that assigns, to each of the microprocessors, an ownership of accessing any of the storage areas; a management section that manages, as an operating ratio, a proportion of a time to be taken for each of the microprocessors to execute a request issued to each of the storage areas; a search section that searches, for transferring the ownership assigned to an arbitrary one of the microprocessors to any of the another microprocessor determined based on the operating ratio, one or more of the storage areas under the ownership of the arbitrary microprocessor for a transfer-target storage area; and a transfer section that transfers, to the another microprocessor, the ownership of the transfer-target storage area that is assigned to the arbitrary microprocessor. The resulting storage system can make full use of the performance capabilities of a storage device, and an ownership transfer method can be provided.
摘要:
A storage system that includes: a plurality of microprocessors; a plurality of storage areas to be formed to a drive group; an assignment section that assigns, to each of the microprocessors, an ownership of accessing any of the storage areas; a management section that manages, as an operating ratio, a proportion of a time to be taken for each of the microprocessors to execute a request issued to each of the storage areas; a search section that searches, for transferring the ownership assigned to an arbitrary one of the microprocessors to any of the another microprocessor determined based on the operating ratio, one or more of the storage areas under the ownership of the arbitrary microprocessor for a transfer-target storage area; and a transfer section that transfers, to the another microprocessor, the ownership of the transfer-target storage area that is assigned to the arbitrary microprocessor. The resulting storage system can make full use of the performance capabilities of a storage device, and an ownership transfer method can be provided.
摘要:
A storage system, which can execute sort processing of data without affecting online service, is disclosed. A storage control device 12 receives a sort instruction specifying a record group for sorting and a sort key from a host device 1, reads the record group from an external storage device 11 into cache memory 123, and uses the cache memory 123 and a work area secured in the external storage device 11 to execute sort processing of the above record group, and again stores the sorted record group in a prescribed output area within the external storage device 11. When a plurality of sort instructions are received, work areas are allocated automatically without overlapping work areas. When record updates occur during online service, a snapshot of the updated records is taken, and sorting of the snapshot is performed.
摘要:
In a data processing system in which a host processing apparatus and a storage subsystem are connected via a channel interface, the present invention makes it possible to expand the number of logical device addresses in excess of the device address limitations of the channel interface, and also enhances the performance of parallel access processing for the same logical device. When an access request is generated for a logical device, the host processing apparatus stores the logical device address to be accessed in a prefix command of a channel command word (CCW) for the access request, sets this CCW in a device information block of a frame which complies with the channel interface, sets a parallel access identifier for identifying a plurality of accesses for the same device in a device address of this frame, and then sends this frame to the storage subsystem.
摘要:
A storage system, which can execute sort processing of data without affecting online service, is disclosed. A storage control device 12 receives a sort instruction specifying a record group for sorting and a sort key from a host device 1, reads the record group from an external storage device 11 into cache memory 123, and uses the cache memory 123 and a work area secured in the external storage device 11 to execute sort processing of the above record group, and again stores the sorted record group in a prescribed output area within the external storage device 11. When a plurality of sort instructions are received, work areas are allocated automatically without overlapping work areas. When record updates occur during online service, a snapshot of the updated records is taken, and sorting of the snapshot is performed.
摘要:
A plurality of modules (1) and (2) comprise a plurality of virtual volumes with which the same volume identification number is associated. A module (2), which receives a write request from a computer, searches for an unallocated real area from among a plurality of real areas in the module (2) rather than from among a plurality of real areas in the other module (1) if a real area has not been allocated to a write-targeted virtual area in accordance with the write request. The module (2) allocates the real area retrieved from the module (2) to the write-targeted virtual area, and writes data according to the write request to this real area.
摘要:
A backup system and backup method with which the processing time can be shortened without increasing the overhead and burden on the system administrator in a two-stage backup.In a backup system which executes a two-stage backup, the storage apparatus searches for a secondary volume which can be paired with a primary volume on the basis of the pair create instruction, determines whether the volume size of the secondary volume obtained as a search result is greater than the volume size of the primary volume and, if the volume size of the secondary volume is greater than the volume size of the primary volume, sets the volume size of the secondary volume as the same size as the volume size of the primary volume without changing the substantial volume size of the secondary volume, and notifies the host of information on the set volume size of the secondary volume and information indicating that a pair has been created.
摘要:
Improvement of read/write access performance with respect to a disk is proposed. A controller manages a first volume format LDEV, in which each distributed user data area and each distributed information area among a plurality of the distributed user data areas for storing a data part and a plurality of the distributed control information area for storing a control information part, are targets that capacity is changed. The controller also manages a second format LDEV, which include a plurality of groups each of which is formed from one distributed user data area and one distributed control information area, and in which each group is a unit that capacity is expanded in a real storage area. The controller converts a data address of the data part belonging to the first volume format LDEV into a data address of a data part of the second volume format LDEV in order to execute input/output processing with respect to the data part, when received an request for access to the data part belonging to the first volume format LDEV.
摘要:
A virtualization system, upon judging that a write operation from a higher-level device is an operation to write in the format of the virtual volume, even when the write position of the write operation is in a virtual area different from a virtual area to which an allocated actual area has been allocated, if there is an unused area in the allocated actual area, writes management information to the unused area according to the write operation, and if there is no unused area in the allocated actual area, newly allocates an unallocated actual area, and writes management information to the newly allocated actual area according to the write operation.