12
RAID Levels
Clone (RAID 1 + Spare)
Creates a standard RAID 1 mirrored
array, and then uses an extra hard drive
as a spare, in case of failure of one of the
disks in the RAID 1.
Span (Concatenation)
Spanning concatenates (joins) multiple
hard drives into a single large disk.
Provides no performance or redundancy
benefits.
RAID 0 (Stripe)
Striping combines multiple disk into a
single large disk array. The data is split
evenly across each disk simultaneously.
Read/write performance is increased as
a result, but failure of any one disk will
make the entire array unusable.
RAID 1 (Mirror)
Mirroring writes the same data across
multiple disks, creating a mirror copy. This
provides redundancy in case one drive
fails.
RAID 5
Uses striping to write data to multiple
disks simultaneously and distribute parity
across multiple disks. Failure of any one
disk will still allow access to the data, until
the disk is replaced.
RAID 10 (1+0)
Creates a RAID 0 striped array, then
mirrors each striped disk. Combines
the performance of RAID 0 with the
redundancy of RAID 1.
