Patent ID: 7171434

Claim:
A method of transferring control of at least one VLUN from a primary central processing element to at least one backup central processing element of a storage virtualization controller arrangement, comprising: detecting an unavailability of the primary central processing element, each backup central processing element associated with a group of the VLUNs and quiescing I/O operations of the primary central processing element for the at least one VLUN; identifying at least one backup central processing element for the at least one VLUN, each backup central processing element associated with a group of the VLUNs: configuring each backup central processing element to control the corresponding group; enabling each backup central processing element to permit new I/O operations; rejecting at least one request from at least one upstream processing element, the at least one request made to the primary central processing element; and reassociating at least one upstream processing element associated with the at least one VLUN from the primary central processing element to the corresponding one of the at least one backup central processing element.