Patent ID: 8156293
Filing Date: 2012-04-10
Classification: G06F

Abstract:
1. A method of controlling a storage system comprising: providing a plurality of storage control processors, each said storage control processor connected for communication with one or more storage devices, said one or more storage devices storing data related to input/output (I/O) operations processed by said one or more storage control processors; installing a first type of storage control software on a first storage control processor of said plurality of storage control processors for processing a first type of said I/O operations; maintaining status of each of said plurality of storage control processors; storing configuration information of a plurality of first volumes controlled by said first type of storage control software and LUN security information; stopping said first type of storage control software on said first storage control processor; releasing said plurality of first volumes from being accessed by said first storage control processor; and reallocating said first type of storage control software to a second storage control processor of said storage control processors by redefining paths to said plurality of first volumes using said configuration information of said plurality of first volumes, and utilizing data stored in said plurality of first volumes and said LUN security information preserved before the releasing, wherein said status maintained is referred to for the releasing.