NEC Express5800/R120g-1E Maintenance Manual page 130

Chapter 2 Useful Features
7. Select a relevant value for RAID, Units, Size, DWC, RA, and Span by using cursor keys.
Press the <Enter> key to fix the selection to determine each value.
(1) RAID: Specify the RAID level.
Parameter
0
1
10
The selectable RAID level varies depending on the number of physical devices that configure the
disk array.
(2) Units:
(3) Size:
Controller. You cannot specify the size for RAID10.
(4) DWC (Disk Write Cache):
Parameter
Off
On*
For this server, write back is recommended for good
performance. Note, however, that cached data may be
lost at an unexpected power failure. Selecting write
through degrades performance by approximately 50%.
(5) RA (Read Ahead): Specify whether to use read-ahead.
Parameter
Off
On*
(6) Span:
This server does not use this feature.
130
Remarks
RAID0
RAID1
RAID10
Important Screen for RAID5 may appear, but this server does not support RAID5.
Specify the unit (MB, GB, or TB) used in the Size field.
Specify the size of the virtual drive. Up to eight virtual drives can be created per RAID
Specify the method for writing cached data to the disk.
Remarks
Write through
Write back
Remarks
Does not perform read ahead.
Performs read ahead.
Specify the span.
Express5800/R120g-1E Maintenance Guide
* Recommended.
* Recommended
4. RAID System Configuration