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APPENDIX

Appendix E

RAID Concept

RAID Set

A RAID set is a group of disks connected to a RAID controller. A

RAID set contains one or more volume sets. The RAID set itself

does not dene the RAID level (0, 1, 1E, 3, 5, 6, 10, 30, 50 60,

etc); the RAID level is dened within each volume set. Therefore,

volume sets are contained within RAID sets and RAID Level is de-

ned within the volume set. If physical disks of different capaci-

ties are grouped together in a RAID set, then the capacity of the

smallest disk will become the effective capacity of all the disks in

the RAID set.

Volume Set

Each volume set is seen by the host system as a single logical

device (in other words, a single large virtual hard disk). A volume

set will use a specic RAID level, which will require one or more

physical disks (depending on the RAID level used). RAID level

refers to the level of performance and data protection of a volume

set. The capacity of a volume set can consume all or a portion of

the available disk capacity in a RAID set. Multiple volume sets can

exist in a RAID set. For the RAID controller, a volume set must be

created either on an existing RAID set or on a group of available

individual disks (disks that are about to become part of a RAID

set). If there are pre-existing RAID sets with available capacity

and enough disks for the desired RAID level, then the volume set

can be created in the existing RAID set of the user’s choice.

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