Patent attributes
Automated Tiered Storage (ATS) has become widely accepted technique in IT industry. Since IO data has different data densities on storage systems, higher storage capacity and improved performance can be achieved by combining two or more storage device tiers having different performance and cost characteristics. These multiple different storage device tiers can be combined into one automated storage pool, which automatically chooses optimal data placement for achieving both the highest performance and the lowest cost. When the storage device tier information can be stored as metadata for each of the data chunks. When there is a system failure and data needs to recovered, the device tier information metadata can be used to restore data to the predetermined optimum storage device tier of the ATS system which shortens the post-recovery warm-up time.
