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RAID 10
A RAID10 drive group is a combination of RAID level 0 and RAID level 1, and it consists of stripes across
mirrored drives. A RAID10 drive group breaks up data into smaller blocks and then mirrors the blocks
of data to each RAID1 drive group. The rst RAID1 drive in each drive group then duplicates its data to
the second drive. The size of each block is determined by the stripe size parameter, which is set during
the creation of the RAID set. The RAID 1 virtual drives must have the same stripe size.
Spanning is used because one virtual drive is defined across more than one drive group. Virtual
drives defined across multiple RAIDlevel 1 drive groups are referred to as RAID level 10, (1+0). Data
is striped across drive groups to increase performance by enabling access to multiple drive groups
simultaneously.
Each spanned RAID 10 virtual drive can tolerate multiple drive failures, as long as each failure is in a
separate drive group. If drive failures occur, less than total drive capacity is available.
Congure RAID 10 drive groups by spanning two contiguous RAID1 virtual drives, up to the maximum
number of supported devices for the controller. A RAID10 drive group supports a maximum of 8spans,
with a maximum of 32drives per span. You must use an even number of drives in each RAID10 virtual
drive in the span.
NOTE
Other factors, such as the type of controller, can restrict the number of drives supported by RAID 10
virtual drives.
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