Method, system, and storage controller for controlling shared memories
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United States of America Patent
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Jan 3, 2006
Grant Date -
Oct 30, 2003
app pub date -
Apr 30, 2003
filing date -
Apr 30, 2002
priority date (Note) -
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status (Latency Note)
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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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