Patent attributes
Systems and methods are disclosed for management of a tiered storage system by a top tier storage device. In some embodiments, an apparatus may comprise a circuit configured to maintain an address map at a first storage tier, receive a read request for specified data, return the specified data when the data exists on the first storage tier, and when the specified data does not exist on the first storage tier, return an indication to query a second storage tier. The circuit may be further configured to determine infrequently accessed cold data stored to the first tier, provide to a host device a copy of the cold data stored in an area of the first storage tier scheduled for defragmentation, and perform the defragmentation operation, including copying valid data to an available area of the first storage tier, the valid data not including the cold data.
