Patent ID: 9086818
Filing Date: 2015-07-21
Classification: G06F

Abstract:
1. A method, comprising: mapping in a plurality of maps for a target storage device, map extent ranges of each map, to corresponding target extent ranges of storage locations on the target storage device; indicating for a particular map extent range of a particular map, that the particular map extent range of the particular map is available for the establishment of a relationship between a source extent range of storage locations on a source storage device containing data to be preserved in the source extent range, and the target extent range mapped to the map particular extent range; receiving a data preservation command identifying a source extent range containing data to be preserved on the source storage device, and identifying a target extent range on the target storage device; in response to the command, performing a data preservation operation including: storing in a data structure for the relationship, an identification of the particular map which indicates usage of the particular map extent range of the particular map by the relationship.