Management of extent migration on tiered storage

摘要

Aspects of the present disclosure are directed toward a method, a system, and a computer program product for managing the migration of extents on tiered systems. The method can include receiving a space reservation request for one or more requested extents on a first storage tier of a storage system. The method can also include releasing a first storage tier reserve space that includes one or more first tier reserved extents in response to the first storage tier reserve space being insufficient for the reservation request. The method can also include migrating the one or more requested extents to the first storage tier reserve space.

主权项

1. A method, comprising:
receiving a space reservation request for one or more requested extents on a first storage tier of a storage system, a second storage tier has a higher relative performance than the first storage tier, the storage system includes both the first storage tier and the second storage tier; releasing a first storage tier reserve space that includes one or more first tier reserved extents in response to the first storage tier reserve space being insufficient for the reservation request by:
prioritizing a plurality of first tier extents on the first storage tier,determining a space deficiency for the space reservation request in the first storage tier,selecting one or more migrating extents on the first storage tier that are at least equal to the space deficiency, the one or more migrating extents include a low priority extent, andmigrating the one or more migrating extents to the second storage tier in response to the second storage tier having a second storage tier reserve space for the one or more migrating extents; and migrating the one or more requested extents to the first storage tier reserve space.