User manual

Chapter 5: RAID Concepts
53
Mirror / Stripe (RAID 10)
A combination of RAID 0 and RAID 1 logical disks. It can increase performance
by reading and writing data in parallel while protecting data with duplication. Four
drives are required for this logical disk.
A RAID 10 logical disk starts with a mirrored pair of disk drives, like a RAID 1
logical disk. Then it stripes the data, like a RAID 0 logical disk, from the mirrored
pair over two more disk drives. The data capacity is similar to a standard RAID 1
logical disk with half of the capacity used for redundancy.
Stripe Size – For RAID 10 logical disks you can manually select the stripe block
size of 32, 64 or 128 MB. The default is 64 KB.
The size selected affects how FastTrak sends data blocks to and receives them
from the drives. You must perform your own testing to determine how the data
block size affects your particular use of the logical disk. In general, a larger block
size is better when handling large data transfers (such as in A/V editing or
graphics) while a smaller block size is better when handling e-mail and other
common server data.
RAID 10 logical disks on FastTrak consist of four disk drives only.
2
4
6
8
1
3
5
7
2
4
6
8
1
3
5
7
Disk Drives
Data
Mirror
Data Stripe