hierarchical storage management


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hierarchical storage management

[¦hī·ər¦är·kə·kəl ′stȯr·ij ‚man·ij·mənt]
(computer science)
A method of managing large amounts of data in which files are assigned to various storage media based on how soon or how frequently they will be needed.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

HSM

(1) See hardware security module.

(2) (Hierarchical Storage Management) The automatic movement of files from costly to less expensive storage media. A typical HSM hierarchy is from HDD/SSD storage drives to optical discs to tape cartridges, or from HDD/SDD drives to tape. HSM software constantly monitors storage drive capacity and moves data from one storage level to the next based on age, category and other criteria.

An HSM system often includes routine backup. When a file is moved off a storage drive, it is replaced with a small stub file that indicates where the backup file is located.

Tier 0 Storage
Increasingly, solid state drives (SSDs) are used to hold data that are most frequently accessed and are one level higher than the hard drives. Consequently, data may migrate back and forth between the HDD and SSD before being stored on optical or tape drives. See tape backup, active archiving, demigration and SSD.


Data Migration
This is a more elaborate HSM migration path, but it can be as simple as magnetic disk to tape. A distinct advantage of optical and tape media is that they are removable and can be taken off premises for protection against fire and accidents.
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References in periodicals archive ?
TELECOMWORLDWIRE-16 October 2000-UniTree launches Linux-based hierarchical storage management software (C)1994-2000 M2 COMMUNICATIONS LTD http://www.m2.com
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2004 marked the 30th anniversary of hierarchical storage management (HSM).
According to IDC, companies worldwide spent 45% of their storage software cash on back-up software (covering back-up, recovery, archiving, and related hierarchical storage management) in the first quarter of 2003.
* If hierarchical storage management (HSM) software has been installed in the computing environment, the migration of data from primary to other media can or may occur automatically, without human intervention, as this functionality usually exists in this class of software.
Hierarchical Storage Management (HSM) is a solution to data management.
The VSM is primarily designed to offload hierarchical storage management from mainframes and puts it on an Iceberg array equipped with in* house developed HSM software and StorageTek tape drives; eventually, the company will enhance the VSM to support Unix and NT servers as well.

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