Methods and apparatus for coordinating shared multiple raid controller access to common storage devices
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United States of America Patent
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Sep 24, 2002
Issued Date -
N/A
app pub date -
Feb 8, 2000
filing date -
Dec 23, 1998
priority date (Note) -
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Abstract
Methods and associated apparatus for performing concurrent I/O operations on a common shared subset of disk drives (LUNs) by a plurality of RAID controllers. The methods of the present invention are operable in all of a plurality of RAID controllers to coordinate concurrent access to a shared set of disk drives. The plurality of RAID controllers operable enhance the performance of a RAID subsystem by better utilizing available processing power among the plurality of RAID controllers. Each of a plurality of RAID controllers may actively process different I/O requests on a common shared subset of disk drives. One of the plurality of controllers is designated as primary with respect to a particular shared subset of disk drives. The plurality of RAID controllers then exchange messages over a communication medium to coordinate concurrent access to the shared subset of disk drives through the primary controller.
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