# Understanding RAID volumes

Note: HostRAID controllers do not support RAID volumes.

For the ServeRAID-8i SAS controller and ServeRAID-7t SATA controller, the ServeRAID Manager supports the following RAID volume types:

- Simple Volume - a single disk drive or segment; not redundant.
- Spanned Volume - two or more disk drives or segments with the same or different capacity, connected end-to-end. A spanned volume offers no redundancy or performance advantage over a single drive.
- RAID Volume - two or more logical drives with the same RAID level, connected end-to-end. The logical drives may have the same or different capacity and are not striped together; they may be redundant, depending on the RAID level.
  Notes:
  1. You must create the individual logical drives before you create a RAID Volume. Use the Configuration wizard to create the logical drives; then, run the Configuration wizard again to create the RAID Volume.
  2. When you create a RAID Volume, the ServeRAID Manager replaces the individual logical drives with a single RAID Volume icon in the Logical devices view; then, it reports the logical drives as deleted in the event viewer. The event message is normal and does not indicate a loss of data.

## More information

- Understanding RAID technology
- Understanding stripe-unit size
- Selecting a RAID level
- RAID level-0
- RAID level-1
- RAID level-1 Enhanced
- RAID level-5
- RAID level-5 Enhanced
- RAID level-5EE
- RAID level-6
- RAID level-x0

Glossary | Contents

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