Methods and structure for using region locks to divert i/o requests in a storage controller having multiple processing stacks

摘要

Methods and structure within a storage controller (100) for using region locks to efficiently divert an I/O request received from an attached host system to one of multiple processing stacks (102, 104) in the controller. A region lock module (106) within the controller allows each processing stack to request a region lock for a range of block addresses of the storage devices. A divert-type lock request may be established to identify a range of block addresses for which I/O requests should be diverted to a particular one of the multiple processing stacks.