Datacrash.net - Storage analysts: RAID is changing

Storage analysts: RAID is changing

Written by Hans Straat source:http://searchstorage.techtarget.com, Wednesday, 02 August 2006

A greater selection of disk types along with advances in storage hardware, rapid data growth and larger drive capacities are changing the way storage administrators use RAID, influencing RAID rebuild times and constraining performance in some environments, according to industry experts.

Historically, certain drive types have a strong correlation to common RAID levels. Enterprise-class Fibre Channel (FC) drives traditionally employed RAID-1 for basic mirroring, but most FC RAID groups will now use a parity-based approach requiring fewer drives, such as RAID-5. If performance must be optimized, striping can be added to the RAID group using RAID-0 -- creating configurations known as RAID-1+0 or RAID-5+0.

The larger storage capacities being offered by more recent FC disks are also causing users to place fewer drives into FC RAID groups. For example, there may be up to eight 36 GB or 73 GB 15K rpm drives in a basic FC RAID group, but as FC drives have climbed to 146 GB and larger, users are employing only four or five drives in a given group.

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