Promise Technology VTrak 15110 - Manual (Page 220)

VTrak 15110 User Manual
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RAID 10 – Mirroring / Striping
Mirroring/Striping combines both of the RAID 0 and RAID 1 disk array types. It
can increase performance by reading and writing data in parallel while protecting
data with duplication. At least four disk drives are needed for RAID 10 to be
installed. With a four-disk-drive disk array, one drive pair is mirrored together then
striped over a second drive pair.
Figure 5. RAID 10 takes a data mirror on one drive pair and stripes it over
two drive pairs
The data capacity is similar to a RAID 1 disk array, with half of the total storage
capacity dedicated for redundancy. An added plus for using RAID 10 is that, in
many situations, such a disk array offers double fault tolerance. Double fault
tolerance may allow your disk array to continue to operate depending on which
two disk drives fail.
RAID 10 disk arrays on VTrak consist of 4 to 14 disk drives.
Data Stripe
Data
Mirror
Disk Drives