MANAGEMENT OF EXTENT MIGRATION ON TIERED STORAGE

摘要

Aspects of the present disclosure are directed toward a system for managing the migration of extents on tiered systems. The system can include receiving a space reservation request for one or more requested extents on a first storage tier of a storage system. The system 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 system can also include migrating the one or more requested extents to the first storage tier reserve space.

主权项

1. A system, comprising:
a plurality of storage tiers on one or more storage devices with at least one high performance storage tier relative to the plurality of storage tiers, wherein a first storage tier from the plurality of storage tiers has one or more available extents; a prioritization module configured to determine a priority of an extent on the plurality of storage tiers and communicate the priority to a space reservation manager; the space reservation manager configured to:
receive a space reservation request for one or more requested extents on a first storage tier of a storage system, wherein a second storage tier has a higher relative performance than the first storage tier;release 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:
receiving the priority of a plurality of extents on the first storage tier from the prioritization module;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;migrating 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;determining whether a third storage tier reserve space can be released in response to the second storage tier not having a second storage tier reserve space for the one or more migrating extents from the first storage tier by:
determining a second tier space deficiency, wherein the second tier space deficiency is a difference between the second storage tier reserve space and the one or more migrating extents from the first storage tier;receiving the priority of a plurality of extents on the second storage tier from the prioritization module; andselecting one or more migrating extents on the second storage tier at least equal to the second storage tier space deficiency; andmigrating one or more migrating extents from the second storage tier to the third storage tier; andmigrate the one or more requested extents to the first storage tier reserve space.