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RAID 10 (also called RAID 1+0) uses a
minimum of four drives and additional drives must be added in
even numbers.
If four drives are used, a pair is first mirrored as in a RAID 1
and then
striped as in RAID 0. The
total storage capacity is calculated by summing the storage
capacity
of all the drives in the array
and dividing it in half. This makes RAID 10
very expensive since it
uses only half of the total capacity of all the drives. RAID
10 does offer increased
performance
over some of the other RAID levels due to the striping that takes
place. Since mirroring occurs
in RAID 10, the
failure of one or more drives is tolerable as
long as there is only one failure per
each mirrored pair.
RAID 10 is frequently used in
many different types of servers that demand high performance
and also in many network attached storage (NAS) devices. For more
information about the
NAS devices with built-in RAID 10 technology,
click here.
The following diagram
illustrates a RAID level 10 (a stripe of mirrors).
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THE
RAID 10 RECOVERY PROCESS: |
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