Encyclopedia of Database Systems

2018 Edition
| Editors: Ling Liu, M. Tamer Özsu

Massive Array of Idle Disks

  • Kazuo GodaEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-8265-9_1346




The term Massive Array of Idle Disks refers to an energy-efficient disk array which has the capability of changing its disk drives into a low-power mode when the disk drives are not busy. Disk drives of the array may be controlled individually or in a group. The term Massive Array of Idle Disks is often abbreviated to MAID. A MAID disk array may have additional functions such as data migration/replication and access prediction to improve the energy saving.

Key Points

The basic idea of MAID is to save energy by exploiting storage access locality. That is, some disk drives which are installed in a disk array are frequently accessed whereas the others are rarely busy. MAID tries to spin down or power off such “low-temperature” disk drives to decrease the total energy consumption. The original papers [1, 2] which introduced MAID in 2002 studied different design choices and configurations. MAID disk arrays are mainly used for archival storage (replacing...

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Recommended Reading

  1. 1.
    Colarelli D, Grunwald D. Massive Arrays of Idle Disks for Storage Archives. In: Proceedings of the 2002 ACM/IEEE Conference on Supercomputing; 2002. p. 1–11.Google Scholar
  2. 2.
    Colarelli D, Grunwald D, Neufeld M. The case for massive arrays of idle disks (MAID). In: Proceedings of the 1st USENIX Conference on File and Storage Technologies Work-in Progress Reports; 2002.Google Scholar
  3. 3.
    Storage Network Industry Association. The dictionary of storage networking terminology. Also available at: http://www.snia.org/.

Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.The University of TokyoTokyoJapan

Section editors and affiliations

  • Masaru Kitsuregawa
    • 1
  1. 1.Inst. of Industrial ScienceUniv. of TokyoTokyoJapan