Quick recovery of write cache in a fault tolerant I/O system

Details Quick recovery of write cache in a fault tolerant I/O system Quick recovery of write cache in a fault tolerant I/O system

1996-03-29

1998-03-03

Hua, Ly

39518213, 3951821, 39518203, G06F 1210, G06F 1314

Patent

active

057245010

ABSTRACT:
A method for recovering data from a cache memory of a second storage controller by access to a cache memory of a first storage controller is presented. The storage controllers are coupled by a private common data path. The method includes copying metadata corresponding to the data stored in the cache memory of the second storage controller to the cache memory of the first storage controller through the private common data path. The metadata may include pointers to and the size of the data. After copying the metadata pointers, the data in the cache memory of the second storage controller is established in the cache memory of the first storage controller. As a result, the entire set of data does not need to be totally recovered to the hard disk before resuming host communications in a recovery operation, which may take a relatively long time. Instead, if a controller fails, only a portion of the data in the cache of the failed controller, the data describing the recovery information, needs to be incorporated into the "dirty" cache of the remaining controller before communications with the host are resumed.

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