Patent ID: 9128636
Filing Date: 2015-09-08
Classification: G06F

Abstract:
1. A storage system configured as a destination storage system for a migration, the storage system coupled to another storage system, the storage system comprising: a plurality of storage disks; a storage controller configured to: manage a pool volume having a storage area provided by the plurality of the storage disks, manage a virtual volume as a thin provisioned volume having one or more segments of a first size to which one or more chunks in the pool volume are allocated when the storage controller writes to the one or more segments, wherein, when data, stored in a source virtual volume managed by the another storage system as another thin provisioned volume having one or more segments of a second size different from the first size, is migrated to the virtual volume, the storage controller is further configured to: obtain mapping information of the source virtual volume from the another storage system configured as a source storage system for the migration; check the obtained mapping information to determine whether another chunk in another pool volume managed by the another storage system has been allocated to a source segment of the source virtual volume, recognize a destination segment, corresponding to the source segment, in the virtual volume based on a size of the destination segment and a size of the source segment, and read the data stored in the source segment to store the data in the recognized destination segment of the virtual volume, if the another chunk has been allocated to the another segment.