Patent ID: 9201751
Filing Date: 2015-12-01
Classification: G06F

Abstract:
1. A method for managing a tiered storage system, the method comprising: providing a default policy for associating logical drives with tiers based on a set of predetermined factors, wherein each tier has different cost and performance parameters; assigning at least two of the logical drives to a same tier based on the default policy; receiving a user-specified tier for one of the at least two of the logical drives assigned to the same tier; assigning the one of the at least two of the logical drives to the user-specified tier, wherein the user-specified tier is different than the same tier with which the at least two of the logical drives are associated based on the default policy; imposing a hierarchy on the tiers; providing a default policy for data migration based on an age or frequency of access of data, the default policy comprising respective default migration ages or respective default migration frequencies of access for each of the tiers; and moving data from a current tier to a destination tier in the hierarchy in response to the data being stored in the current tier for a period of time greater than the respective default migration age or greater than the respective default migration frequency of access.