[KLUG Members] RAID

[Adam Tauno Williams]

On Thu, 2005-10-06 at 00:01 +0530, Komal wrote:
> Is there a difference between RAID 10 ,RAID 01 ,RAID 0+1 and RAID 1+0
> or these are name for stripping with mirroring?

http://www.webopedia.com/TERM/R/RAID.html
Level 0 -- Striped Disk Array without Fault Tolerance: Provides data
striping (spreading out blocks of each file across multiple disk drives)
but no redundancy. This improves performance but does not deliver fault
tolerance. If one drive fails then all data in the array is lost.
Level 1 -- Mirroring and Duplexing: Provides disk mirroring. Level 1
provides twice the read transaction rate of single disks and the same
write transaction rate as single disks.
Level 0+1 – A Mirror of Stripes: Not one of the original RAID levels,
two RAID 0 stripes are created, and a RAID 1 mirror is created over
them. Used for both replicating and sharing data among disks.
Level 10 – A Stripe of Mirrors: Not one of the original RAID levels,
multiple RAID 1 mirrors are created, and a RAID 0 stripe is created over
these.

Any RAID that is two digits or this+that is a combo RAID setup using
multiple RAID levels at the same time.