STORAGE SYSTEM AND DATA PROCESSING METHOD

Abstract: a processor uses a snapshot virtual device as a storage destination for data of a primary volume and a snapshot volume, compresses data stored in the snapshot virtual device and stores the compressed data in a compression virtual device, and stores the data stored in the compression virtual device in a storage device. when a write request is received from a host, the processor switches, according to a size of an address range of a write destination, between overwriting processing of overwriting an area on the snapshot virtual device which is allocated to large-size data and new allocation processing of allocating a new area on the snapshot virtual device to the address range of the write destination for small-size data, and compresses a plurality of pieces of small-size data stored in the new area and collectively stores the plurality of pieces of small-size data in the compression virtual device.

Inventor(s): Yoshihiro YOSHII, Takashi NAGAO, Tomohiro YOSHIHARA

CPC Classification: G06F16/128 ({Details of file system snapshots on the file-level, e.g. snapshot creation, administration, deletion (use of snapshots for error detection or correction , )})

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