Electrical computers and digital processing systems: memory – Storage accessing and control – Shared memory area
Reexamination Certificate
2006-01-03
2006-01-03
Thai, Tuan V. (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Shared memory area
C711S118000, C711S130000, C709S213000
Reexamination Certificate
active
06983349
ABSTRACT:
A method for controlling shared memories permits I/O data exchange among storage controllers. A storage controller is provided for each of a plurality of disk array devices. Each storage controller includes at least one shared memory. Each shared memory stores information about the disk array devices. On each shared memory, addresses of the shared memories of other storage controllers are stored. An I/O request is received from a host device with one storage controller A. The storage controller A identifies an address of a shared memory managing a volume that is a target of the request. If the address is of a shared memory of another storage controller B, the storage controller A issues an instruction to a switching device to establish a connection path between the storage controller A's memory and the storage controller B's memory. The host device is notified that a connection path has been established.
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Honma Hisao
Okumoto Katsuhiro
Hitachi , Ltd.
Thai Tuan V.
Townsend and Townsend / and Crew LLP
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