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 method for use in a storage system, the method comprising:
receiving a request to copy data from a first range of a first volume associated with a first medium to a second range of a second volume associated with a second medium; and responsive to receiving the request:
creating a third medium;storing an indication that the first medium underlies the third medium; andstoring an indication that the second range of the second volume is associated with the third medium.