Compression on thin provisioned volumes using extent based mapping

A computer program product for facilitating data compression, the computer program product comprising a non-transitory computer-readable storage medium having computer-readable program code portions stored therein, the computer-readable program code portions comprising:

• a first executable portion for mapping a set of logical extents, each of the set of logical extents having compressed logical tracks of data, to a head physical extent and, if the head physical extent is determined to have been filled, to at least one overflow extent having spatial proximity to the head physical extent;
• and
• a second executable portion for pursuant to at least one subsequent write operation and destage operation, the at least one subsequent write operation and destage operation determined to be associated with the head physical extent, mapping the at least one subsequent write operation and destage operation to one of the head physical extent, the at least one overflow extent, and an additional extent having spatial proximity to the at least one overflow extent;
• wherein the mapping of the at least one subsequent write operation and destage operation to the head physical extent is performed using a hash function incorporating a compressed volume identification (id) and an extent number in a compressed volume associated with the compressed volume id.