NEC Express5800/T120e Maintenance Guidance page 93

Chapter 2 Useful Features
7. Use the cursor keys to move the cursor to RAID, Size, DWC, RA, or Span.
To specify each setting, press <Enter> key.
(1) RAID: Specifies the RAID level.
Parameter
The available RAID level is depending on the number of hard disk drives configuring the array.
(2) Units: Specifies the units of the Virtual Drive capacity specified by Size (MB, GB, or TB).
(3) Size:
(4) DWC: Specifies the disk write cache.
Parameter
* On (write back) is recommended for this server, but note that
cache data is lost when a power failure occurs.
When Off is chosen, the performance is lowered to 50% or less
compared with On state.
(5) RA: Specifies whether to perform read ahead.
Parameter
(6) Span: Specifies the span setting.
This parameter is not used for this server.
Description
0
1
10
Important Although RAID5 is displayed, this server does not support RAID5.
Specifies the Virtual Drive capacity. Up to eight Virtual Drives can be created. For RAID10,
the Virtual Drive capacity cannot be specified.
Description
Off Write through
On* Write back
Description
Off Does not perform read ahead
On* Performs read ahead
Express5800/T120e Maintenance Guide
RAID0
RAID1
RAID10
*Recommended
*Recommended
4. RAID System Configuration
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