Patent ID: 8255660
Filing Date: 2012-08-28
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 number within the range of the bucket, wherein the entry corresponds to a count of territories stored in the tier and having a lifecycle management metric within the bucket; and moving a territory from a current tier to destination tier in response to the information lifecycle management metric associated with the territory being within the bucket associated with the destination tier.