NEC Express 5800 Series Maintenance Manual page 108

Chapter 2 Useful Features
7. Use the arrow keys to move the cursor to RAID, Size, DWC, RA, or Span.
To specify each setting, press <Enter> key.
(1) RAID: Specify the RAID level.
The available RAID level is depending on the number of hard disk drives configuring the 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. The capacity of the
virtual drive for RAID10 cannot be specified.
(4) DWC: Specify the disk write cache.
* On (write back) is recommended for this server, but note that cache
data is lost when power failure occurs.
When Off is selected, the performance is lowered to 50% or less
compared with On state.
(5) RA: Specify whether to perform read ahead.
(6) Span: Specify the span settings.
This parameter is not used for this server.
108
Parameter
0 RAID0
1 RAID1
10 RAID10
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
Parameter
Off Do not perform read ahead
On* Perform read ahead
Express5800/T110f-S, R110f-1E, T110f-E Maintenance Guide
Description
Description
*Recommended
Description
*Recommended
5. RAID System Configuration