摘要:
Provided is a computer system including: a host computer; a first storage system connected to the host computer; and a second storage system connected to the first storage system; in which the first storage system sets a first logical volume recognized by the host computer as a logical storage area; the first logical volume includes a plurality of first storage areas; a first real storage area on the first disk drive is allocated to at least one of the first storage areas. In the computer system, the second storage system sets a second logical volume corresponding to the first logical volume, and the first storage system transmits data stored in the first storage area allocated to the first storage area to the second storage system when the first real storage area is allocated to the first storage area.
摘要:
Provided is a computer system including: a host computer; a first storage system connected to the host computer; and a second storage system connected to the first storage system; in which the first storage system sets a first logical volume recognized by the host computer as a logical storage area; the first logical volume includes a plurality of first storage areas; a first real storage area on the first disk drive is allocated to at least one of the first storage areas. In the computer system, the second storage system sets a second logical volume corresponding to the first logical volume, and the first storage system transmits data stored in the first storage area allocated to the first storage area to the second storage system when the first real storage area is allocated to the first storage area.
摘要:
Provided is a computer system including: a host computer; a first storage system connected to the host computer; and a second storage system connected to the first storage system; in which the first storage system sets a first logical volume recognized by the host computer as a logical storage area; the first logical volume includes a plurality of first storage areas; a first real storage area on the first disk drive is allocated to at least one of the first storage areas. In the computer system, the second storage system sets a second logical volume corresponding to the first logical volume, and the first storage system transmits data stored in the first storage area allocated to the first storage area to the second storage system when the first real storage area is allocated to the first storage area.
摘要:
Both of continuation of a job and response to a system failure caused by a disaster are realized simultaneously at low costs. When a failure in remote copy is reported from storage 103A, host 102A starts the host-based remote copy. At this time, first the remote copy is performed starting from the copy to an unfinished I/O. when it becomes possible to restart the storage-based remote copy, the host 102A first stops issuing an I/O and waits for completion of an outstanding I/O in accordance with a command from management server 104A. Thereafter, the host 102A switches over a remote copy method and restarts the I/O.
摘要:
Among a plurality of microprocessors 12, 32, when the load on a microprocessor 12 which performs I/O task processing of received I/O requests is equal to or greater than a first load, the microprocessor assigns at least an I/O task portion of the I/O task processing to another microprocessor 12 or 32, and the other microprocessor 12 or 32 executes at least the I/O task portion. The I/O task portion is a task processing portion comprising cache control processing, comprising the securing in cache memory 20 of a cache area, which is one area in cache memory 20, for storage of data.
摘要:
A computer system having a plurality of controllers for data input/output control is provided, wherein even if a control authority of a processor is transferred to another processor and the computer system migrates control information necessary for a controller to execute data input/output processing, from a shared memory to a local memory for the relevant controller, the computer system prevents the occurrence of unbalanced allocation of a control function necessary for data input/output control between the plurality of controllers; and a load equalization method for such a computer system is also provided.
摘要:
Among a plurality of microprocessors 12, 32, when the load on a microprocessor 12 which performs I/O task processing of received I/O requests is equal to or greater than a first load, the microprocessor assigns at least an I/O task portion of the I/O task processing to another microprocessor 12 or 32, and the other microprocessor 12 or 32 executes at least the I/O task portion. The I/O task portion is a task processing portion comprising cache control processing, comprising the securing in cache memory 20 of a cache area, which is one area in cache memory 20, for storage of data.
摘要:
Among a plurality of microprocessors 12, 32, when the load on a microprocessor 12 which performs I/O task processing of received I/O requests is equal to or greater than a first load, the microprocessor assigns at least an I/O task portion of the I/O task processing to another microprocessor 12 or 32, and the other microprocessor 12 or 32 executes at least the I/O task portion. The I/O task portion is a task processing portion comprising cache control processing, comprising the securing in cache memory 20 of a cache area, which is one area in cache memory 20, for storage of data.
摘要:
A computer system having a plurality of controllers for data input/output control is provided, wherein even if a control authority of a processor is transferred to another processor and the computer system migrates control information necessary for a controller to execute data input/output processing, from a shared memory to a local memory for the relevant controller, the computer system prevents the occurrence of unbalanced allocation of a control function necessary for data input/output control between the plurality of controllers; and a load equalization method for such a computer system is also provided.
摘要:
There are a loose coupling and a tight coupling as the coupling configurations for a first module and a second module. The loose coupling is a coupling configuration in which the first and second modules are coupled together by way of a front-end path, and the first module is not able to access a second storage resource. The tight coupling is a coupling configuration in which the first and second modules are coupled together by way of a back-end path, and the first module is able to access the second storage resource. A switch from the loose coupling to the tight coupling is performed using the following processing flow without the first and second modules being partitioned into respectively independent storage modules. Specifically, first, the first and second modules are coupled together by way of the back-end path, and next, the first module merges information denoted by second management information from the second storage resource with first management information via the back-end path.