Patent ID: 8812811
Filing Date: 2014-08-19
Classification: G06F

Abstract:
1. A method for migrating data between tiers of a storage system, the method comprising: subdividing a storage capacity of the storage system into a set of territories; partitioning the set of territories into tiers; partitioning a range of information lifecycle management metrics into buckets, each bucket corresponding to one of the tiers; maintaining a data structure relating the buckets and the tiers, the data structure containing an entry for each relationship of a bucket and a tier that is a number of territories currently stored in the tier having an information lifecycle management metric within the range of the bucket; moving a territory from a current tier to a destination tier in response to the information lifecycle management metric associated with the territory being within the range of the bucket associated with the destination tier, wherein moving a territory comprises demoting a territory from a higher tier to a lower tier in response to the information lifecycle management metric associated with the territory being within the range of the bucket associated with the lower tier.