NEC Express5800 Series Maintenance Manual page 102

Chapter 2 Convenient Features
7. Use the cursor keys to move the cursor to RAID, Size, DWC, RA, or Span.
Press the <Enter> key while the target parameter is highlighted to specify its setting.
(1) RAID: Specify the RAID level.
The selectable RAID level varies depending on the number of Hard Disk Drives configuring the disk
array.
(2) Units: Specify the units of the Virtual Drive capacity specified by Size (MB, GB, or TB).
(3) Size: Specify the Virtual Drive capacity. Up to eight Virtual Drives can be created. For RAID10, the
Virtual Drive capacity cannot be specified.
(4) DWC: Specify the disk write cache.
(5) RA: Specify whether to perform read ahead.
(6) Span: Specify the span setting.
This parameter is not used for this server.
102
Parameter
0 RAID0
1 RAID1
Important Although RAID5 is displayed if three or more Hard Disk Drives are
configured, this server does not support RAID5.
Parameter
Off Write through
On* Write back
* Considering the performance, On (write back) is
recommended for this server. Note, however, cache
data might be lost in the case of unexpected power
failure when On is specified.
When Off is selected, the performance is lowered to
50% or less compared with when On is selected.
Parameter
Off Do not perform read ahead
On* Perform read ahead
Express5800/E120d-1 Maintenance Guide
Remarks
Remarks
*Recommended
Remarks
*Recommended
5. RAID System Configuration