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Appendix B: SATA RAID configuration

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.

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.

 

 

To configure arrays and logical drives you can select from the following options:

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Acer G320 Series manual Configuring arrays and logical drives, Configuration guidelines, Physical drive parameters

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