Patent
1995-12-29
1998-07-28
Decady, Albert
395427, G06F 1100, G06F 1200
Patent
active
057872422
ABSTRACT:
Methods and apparatus for moving pinned data corresponding to a temporarily dead RAID device between the cache memory of a RAID subsystem and a log area. In response to detection of a dead RAID device within a RAID subsystem, the methods of the present invention move any pinned data from the cache memory of the RAID controller to a log area preferably allocated on the disk space of one or more operational RAID devices within the subsystem. In response to revival of the dead RAID device methods of the present invention restore the logged, pinned data from the log area of the operational RAID device(s) to the cache memory as dirty data ready for posting to the revived RAID device. The log area may be either permanently allocated within the RAID subsystem, or may be dynamically allocated in response to recognition of the dead RAID device and freed in response to revival of the RAID device.
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DeKoning Rodney A.
Humlicek Donald R.
Johnson Max L.
Bailey Wayne P.
De'cady Albert
Fishman Daniel N.
Symbios Logic Inc.
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