Patent ID: 8151066
Filing Date: 2012-04-03
Classification: G06F

Abstract:
1. A computer system comprising: a computer; and a first storage system having one or more first logical storage devices where a plurality of files are stored, a second storage system having one or more second logical storage devices, wherein said computer includes: a hash value calculation unit that calculates a plurality of hash values that are values intrinsic to contents of a plurality of files, respectively; and a hash value transmission unit that transmits a plurality of hash values corresponding respectively to said plurality of files to said first storage system, and said first storage system includes: a duplication determination unit that determines whether two or more identical hash values are contained in said plurality of hash values; and a change control unit that changes an access destination of a first file corresponding to a first hash value from among these two or more identical hash values, to a position having stored therein a second file corresponding to a second hash value from among these two or more identical hash values when there are said two or more identical hash values, a migration execution unit which, when the migration execution unit migrates data stored in files stored in said one or more first logical storage devices to said one or more second logical storage devices, does not migrate first data of said first file to any of said one or more second logical storage devices, and migrates second data of said second file to any of said one or more second logical storage devices.