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 …

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 …

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 …

(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 …

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 …

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; …

Applying a rate limit across a plurality of storage systems, including: determining a rate limit
for paired storage systems; receiving, by a first storage system, an amount of I/O operations …

Mechanisms for managing data segments in a tiered storage system are provided. The
mechanisms maintain at least one counter for each data segment in the tiered storage …

A method for Dynamic Storage Tiering (DST) may include identifying a first storage tier with
a performance characteristic. The method may include monitoring the utilization of the first …

(57) ABSTRACT A method is used in managing data in a data storage system. A tiered
storage pool is identified wherein the storage pool includes multiple tiers having multiple …