Patent ID: 7966296
Filing Date: 2011-06-21
Classification: G06F

Abstract:
1. A storage system comprising: one or more storage controllers for storing file data, comprising data that has been sent from a host system and arranged in a plurality of files, each file having a size and attribute, that is to be compressed, wherein said one or more storage controllers comprise: a master unit responsive to a user input for setting a common compression ratio target value and performance target value in the storage system; a measurement unit for measuring a throughput value and compression ratio for each file; a statistical information management unit for managing a throughput value for each file as decided based on statistical information of previously compressed file data as a system performance value; a mode setting unit for setting for each file a compression mode of either (1) a system performance priority mode that terminates compression of said file data and gives priority to system performance or (2) a compression priority mode, indicating a level of priority given to compression, which is determined in relation to performance, that gives priority to compression of said file data based on a comparison between a system performance target value preset as a target value and said system performance value; a compression controller for compressing said file data in each file, based on said compression mode set with said mode setting unit; and a subsequent file compression mode decision unit which is executed, when the compression priority mode of a first file is set to a first priority mode, to change the compression priority mode of the first priority mode according to the conditions (a)-(d) below: