Performing copies in a storage system

摘要

A system and method for performing copy offload operations. When a copy offload operation from a first volume (pointing to a first medium) to a second volume (pointing to a second medium) is requested, the copy offload operation is performed without accessing the data being copied. A third medium is created, and the first medium is recorded as the underlying medium of the third medium. The first volume is re-pointed to the third medium. Also, a fourth medium is created, the second volume is re-pointed to the fourth medium, and the second medium is recorded as the underlying medium of the targeted range of the fourth medium. All other ranges of the fourth medium have the second medium as their underlying medium.

主权项

1. A computer system comprising:
one or more storage devices; and a storage controller coupled to the one or more storage devices; wherein responsive to receiving a request to copy a first range of data from a first volume associated with a first medium to a second range of a second volume associated with a second medium, the storage controller is configured to:
create a third medium, store an indication that the first medium underlies the third medium, and associate the first volume with the third medium;create a fourth medium, store an indication that the second medium underlies the fourth medium, and associate the second volume with the fourth medium; andstore an indication that the first range of data in the first medium underlies the second range in the fourth medium.