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RAID levels
After installing the ServeRAID-MR10k RAID controller, the following RAID levels
may be used:
RAID-0
Uses striping to provide high data throughput, especially for large files in an
environment that does not require fault tolerance.
RAID-1
Uses mirroring so that data written to one disk drive is simultaneously written
to another disk drive. This is good for small databases or other applications
that require small capacity but complete data redundancy.
RAID-5
Uses disk striping and parity data across all drives (distributed parity) to
provide high data throughput, especially for small random access.
RAID-6
Uses distributed parity, with two independent parity blocks per stripe, and disk
striping. A RAID 6 virtual disk can survive the loss of two disks without losing
data.
Note: The MR10k implements a variation of RAID-6 to allow usage of three
hard disk drives.
RAID-10
A combination of RAID-0 and RAID-1, consists of striped data across
mirrored spans. It provides high data throughput and complete data
redundancy but uses a larger number of spans.
RAID-50
A combination of RAID-0 and RAID-5, uses distributed parity and disk
striping, and works best with data that requires high reliability, high request
rates, high data transfers, and medium-to-large capacity.
Note: Having RAID-0 and RAID-5 virtual disks in the same physical array
is not recommended. If a drive in the physical RAID-5 array has to be
rebuilt, the RAID-0 virtual disk can result in a rebuild failure.
RAID-60
A combination of RAID-0 and RAID-6, uses distributed parity, with two
independent parity blocks per stripe in each RAID set, and disk striping. A
RAID-60 virtual disk can survive the loss of two disks in each of the RAID-6
Chapter 3. Hardware configuration
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