Toshiba Magnia 560S - Manual (Page 153)

Logical Drives
WebBIOS Configuration Utility
135
Logical Drive Definition
The Logical Drive definition screen displays next. Click on a logical drive to display
the following screen for that drive. Use this screen to configure the logical drive.
Perform the following steps to configure a logical drive:
1. Click on the down arrow in the box to the right of RAID Level to display the
possible RAID levels for the logical drive.
2. Select the RAID level from the list.
3. Select the Stripe Size.
Stripe size specifies the size of the segments written to each disk in a RAID 0, 5, 10,
or 50 logical drive. You can set the stripe size to 2 KB, 4 KB, 8 KB, 16 KB, 32 KB,
64 KB, or 128 KB. A larger stripe size produces better read performance, especially
if your computer does mostly sequential reads. If you are sure that your computer
does random read requests more often, choose a small stripe size. The default is 64
KB.
4. Select the Read Policy.
Read-policy enables the SCSI read-ahead feature for the logical drive. You can set
this parameter to Normal, Read-ahead, or Adaptive.
- Normal specifies that the controller does not use read-ahead for the current
logical drive.
- Read-ahead specifies that the controller uses read-ahead for the current logical
drive.
- Adaptive specifies that the controller begins using read-ahead if the two most
recent disk accesses occurred in sequential sectors. If all read requests are
random, the algorithm reverts to Normal; however, all requests are still
evaluated for possible sequential operation. This is the default setting.