Patent ID: 8006061
Filing Date: 2011-08-23
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; grouping the set of territories into tiers; imposing an ordering on the tiers; maintaining an information lifecycle management metric for each territory; grouping a range of all possible information lifecycle management metrics into buckets, each bucket corresponding to one of the tiers; establishing, for each tier and corresponding bucket, counts of territories grouped in the tier and having the information lifecycle management metric within the corresponding bucket; promoting a territory from a lower tier to a higher tier in response to the information lifecycle management metric associated with the territory being within the bucket associated with the higher tier; and 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 bucket associated with the lower tier.