Storage capable of cache assignment modification
3 Assignments
0 Petitions
Accused Products
Abstract
To provide a storage system which enables usage of a greater volume of cache than that of a cache memory provided to a disk array control unit, including a first disk array control unit, a second disk array control unit, a plurality of disks, and a disk array control unit communication path between a first data transfer control unit and a second data transfer control unit, wherein the first data transfer control unit selectively sets either a first path through a first host input/output control unit, the first data transfer control unit, and a first disk input/output control unit, or a second path through the first host input/output control unit, the first data transfer control unit, the disk array control unit communication path, the second data transfer control unit, and a second disk input/output control unit, and then processes a data input/output request from a host
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Citations
13 Claims
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1. (canceled)
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2. (canceled)
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3. (canceled)
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4. A storage system comprising a first disk array control unit, a second disk array control unit, and a plurality of disks,
the first disk array control unit comprising a first CPU, a first host input/output control unit that sends and receives data and control signals to/from a host connected to the storage system, a first disk input/output control unit that sends and receives data and control signals to/from the disks, and a first data transfer control unit that controls data transfer between the first host input/output control unit and the first disk input/output control unit, the second disk array control unit comprising a second CPU, a second host input/output control unit that sends and receives data and control signals to/from the host connected to the storage system, a second disk input/output control unit that sends and receives data and control signals to/from the disks, and a second data transfer control unit that controls data transfer between the second host input/output control unit and the second disk input/output control unit, the storage system further comprising a disk array control unit communication path connecting between the first data transfer control unit and the second data transfer control unit to communicate each other, the first CPU selecting one of a first path through the first host input/output control unit, the first data transfer control unit, and the first disk input/output control unit, and a second path through the first host input/output control unit, the first data transfer control unit, the disk array control unit communication path, the second data transfer control unit, and the second disk input/output control unit, and processing a data input/output request from the host using the selected path.
Specification