American Megatrends MegaRAID Express 500 - Manual (Page 38)

MegaRAID Express 500 Hardware Guide 24
RAID 10
RAID 10 is a combination of RAID 0 and RAID 1. RAID 10 has mirrored
drives. RAID 10 breaks up data into smaller blocks, and then stripes the blocks
of data to each RAID 1 raid set. Each RAID 1 raid set then duplicates its data to
its other drive. The size of each block is determined by the stripe size parameter,
which is set during the creation of the RAID set. RAID 10 can sustain one to
four drive failures while maintaining data integrity if each failed disk is in a
different RAID 1 array.
Uses RAID 10 works best for data storage that must have 100%
redundancy of mirrored arrays and that also needs the
enhanced I/O performance of RAID 0 (striped arrays).
RAID 10 works well for medium-sized databases or any
environment that requires a higher degree of fault tolerance
and moderate to medium capacity.
Strong Points RAID 10 provides both high data transfer rates and
complete data redundancy.
Weak Points RAID 10 requires twice as many drives as all other RAID
levels except RAID 1.
Drives 2n, where n is greater than 1.