Patent ID: 8555004
Filing Date: 2013-10-08
Classification: G06F

Abstract:
1. A storage system which receives from a computer, a first input/output (I/O) command, designating a first port ID and a first logical unit, the storage system comprising: a plurality of ports, including a port to which said first port ID is assigned and which receives said first I/O command; a plurality of logical storage devices, including a first logical storage device corresponding to a first logical ID which is assigned to said first logical unit of a plurality of logical units provided to the computer, each of the plurality of logical storage devices storing data the computer accesses, wherein one or more of the plurality of logical units is assigned to each of the plurality of logical storage devices, and wherein when more than one of the plurality of logical units are assigned to said first logical storage device, there are a plurality of paths formed between said first logical storage device and each of the plurality of logical units assigned to said first logical storage device; an I/O control unit which, in response to said first I/O command, performs I/O for said first logical storage device; a memory which stores a path table, the path table comprising a number indicating an amount of the plurality of paths formed between said first logical storage device and each of the plurality of logical units assigned to said first logical storage device; a structure management processing unit that receives a delete command to delete a path of the plurality of paths, and in response to the delete command, deletes the path and decrements the number of the plurality of paths in the path table by 1; a detection unit which detects a system change according to which I/O for said first logical storage device cannot be performed; a security processing unit, which by taking advantage of an opportunity presented by detection of said system change, performs security processing, which is formatting or shredding, upon said first logical storage device, wherein the opportunity to perform the formatting or shredding is taken when the number of the plurality of paths becomes 0, which indicates that each of the plurality of paths formed between said first logical storage device and the plurality of logical units assigned to said first logical storage device is deleted, and wherein the data stored in the first logical storage device is deleted by formatting or shredding.