Patent ID: 11880278
Assignee: HITACHI, LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A storage system comprising:
a processor; and
a plurality of physical storage drives that are each respectively housed in one of a plurality of drive enclosures,
wherein the processor
configures a virtual chunk with k (k is an integer equal to or larger than two) virtual parcels including a virtual parcel having user data and a respective virtual parcel having element data that is redundant data for repairing the user data, and
stores the virtual parcels included in a same virtual chunk by mapping the virtual parcels in storage areas of k of mutually different physical storage drives among N (k<N) of the plurality of physical storage drives,
maps the virtual parcels such that a maximum value of a numbers of the virtual parcels mapped to particular physical storage drive housed in a same drive enclosure among the plurality of drive enclosures is equal to or smaller than p/r, where redundancy of the virtual chunk is p, and a number of drive enclosures among the plurality of drive enclosures that are able to be active even if a failure occurs is r (r≤p).