Patent ID: 8843716
Filing Date: 2014-09-23
Classification: G06F

Abstract:
1. A computer system comprising a management apparatus and a storage apparatus; wherein: the storage apparatus comprises a plurality of storage devices and a processor; the processor: provides a first virtual volume and a second virtual volume both referring to the same pool area; compresses first write data to the first virtual volume and stores it in the pool area that is referred to by the first virtual volume to which the first write data is written; upon receiving a read request to the first virtual volume, decompresses the compressed data stored in the pool area referred to by the first virtual volume to which the read request is directed, and responds the decompressed data; the management apparatus, if a backup of the first virtual volume is performed without decompression, instructs a backup computer connected with the management apparatus to perform a backup with the second virtual volume as the backup target; and the processor, responding to reading out of the second virtual volume from the backup computer, forwards the compressed data read out from the pool area associated with the second virtual volume without decompression.