Patent ID: 11861205
Assignee: HITACHI, LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 5:
6. The distributed storage system according to claim 2, wherein
a group storage owner volume of the third computer is each of one or more member volumes to which a snapshot function is applied,
the snapshot function is a function of acquiring a snapshot of a specified volume,
the one or more member volumes include one or more snapshot volumes, and a base volume as a direct or indirect base of the one or more snapshot volumes,
each of the one or more snapshot volumes is a volume as a snapshot of the base volume or one of the snapshot volumes,
the third computer includes
snapshot management data indicating a snapshot tree representing a relationship of the one or more member volumes, and
snapshot mapping data including domain control data indicating a relationship between a volume region and a reference destination region of the volume region for each of one or more snapshot volumes in the one or more member volumes, and
when the third computer identifies that one of the member volumes is specified as the volume as the migration object from the third computer to a fourth computer, the third computer copies, to the fourth computer, domain control data on at least the specified member volume among all the member volumes including the specified member volume in the snapshot mapping data and the snapshot management data.