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Appendix B: SATA RAID configuration
102
Configuring arrays and logical drives
Configuration guidelines
We recommend using drives with the same capacity in a specific array.
If you use drives with different capacities in an array, the CU treats all
these drives as if they have the capacity of the smallest drive.
The number of physical drives in a specific array determines the
possible RAID levels that you can implement with the array. RAID 0
requires one to four physical drives, RAID 1 requires two physical
drives, and RAID 10 requires four physical drives.
Physical drive parameters
You can change the write policy and read policy in the physical drives,
but not the logical drives.
Logical drive parameters
For the logical drive you can change the RAID level and stripe size. The
table below contains descriptions of the logical drive parameters.
To configure arrays and logical drives you can select from the following
options:
Parameter Description
RAID level The number of physical drives in a specific array determines
the RAID levels that can be implemented with the array.
RAID 0 requires one or two physical drives.
RAID 1 requires exactly two physical drives.
RAID 10 requires four physical drives.
Stripe size The stripe size parameter specifies the size of the segment
written to each disk in a RAID configuration. You can set the
stripe size to 4, 8, 16, 32, 64, or 128 KBs. The default is 64 KB.
A larger stripe size produces higher read performance. If
your computer regularly performs random read requests,
choose a smaller stripe size.