Patent ID: 8380893

Claim:
A storage system, comprising: an interface unit that is coupled to a management computer; a shared memory; a plurality of micro processor packages, each of the plurality of micro processor packages associated with at least one micro processor; and a communication network for communicably coupling the interface and the plurality of micro processor packages; wherein the interface unit is configured to: receive a micro processor package replacement request; select a first micro processor package from the plurality of micro processor packages associated with the request; transmit a micro processor package shutdown instruction to the first micro processor package; confirm replacement of the first micro processor package after receipt of a micro processor package shutdown completion notice; and, transmit a micro processor package restart instruction to the first micro processor package if the replacement of the first micro processor package is confirmed; wherein each of the plurality of micro processor packages is configured to: receive the micro processor package shutdown instruction via the associated at least one micro processor; unlock control information for each of a plurality of logical devices associated with the at least one micro processor from the shared memory, upon completion of processing for the each logical device by the at least one micro processor; transmit the micro processor package shutdown completion notice; receive the micro processor package restart instruction; lock control information for each of the plurality of logical devices associated with the micro processor package restart instruction in the shared memory after receipt of the micro processor package restart instruction; and transmit a micro processor package restart completion notice.