Disclosed is a process for determining a heat index for a block of data, such as an extent, for
storage tiering. Weighted scores are used for read and write operations, since solid state …

Migrating data in a tiered storage system. The tiered storage system includes an upper tier
with at least one storage device and a lower tier with at least one storage device. Data on a …

A method for metadata management in a storage system configured for supporting sub-LUN
tiering. The method may comprise providing a metadata queue of a specific size; …

Migrating data in a tiered storage system. The tiered storage system includes an upper tier
with at least one storage device and a lower tier with at least one storage device. Data on a …

The invention relates to retrieving data from a storage system. One embodiment of the
invention comprises receiving a write operation, establishing a correspondence relationship …

BACKGROUND The present invention relates to data storage systems, and more
particularly, this invention relates to a caching scheme for extent migration. In current hybrid …

(57) ABSTRACT Input/output (I/O) activity in the multiple tier storage system is monitored to
collect statistical information. The statistical information is recurrently transformed into an …

(57) ABSTRACT A Storage apparatus has input means for inputting an input/output
execution time prediction request from an external System and determining means for …

A data storage system (10) that receives a data set from a software module (18A-D) includes
a first tier storage device (240), a second tier storage device (242), a redundancy reducer …

The present invention includes embodiments that minimize storage space and storage time
in storage systems. In particular, the present invention appends additional information to …