automated storage tiering (AST)
Automated storage tiering (AST) is a storage software management feature that dynamically moves
information between different disk types and RAID levels to meet space,
performance and cost requirements.
Automated storage tiering features use policies that are set up by storage administrators. For
example, a data storage administrator can assign infrequently used data to slower, less-expensive
SATA storage but allow it
to be automatically moved to higher-performing SAS or solid-state
drives (SSDs) as it
becomes more active (and vice versa).
The technology, pioneered by Compellent Technologies in its Storage Center Data Progression
product in 2005 (Compellent has since been acquired by Dell Inc.), automatically classifies and
migrates data to the optimum tier of storage.
Sub-LUN
automated storage tiering moves data at a more granular level.
See also: automated data
tiering
Contributor(s): Kimberly Hefner
This was last updated in August 2011
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