5. RAID System Configuration
Express5800/R120f-2E, T120f Maintenance Guide
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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
Remarks
0
RAID0
1
RAID1
10
RAID10
The selectable RAID level varies depending on the number of physical devices that configure the
disk array.
Important Screen for RAID5 may appear, but this server does not support RAID5.
(2)
Units
:
Specify the unit (MB, GB, or TB) used in the
Size
field.
(3)
Size
:
Specify the size of the virtual drive. Up to eight virtual drives can be created per RAID
Controller. You cannot specify the size for RAID10.
(4)
DWC
(Disk Write Cache):
Specify the method for writing cached data to the disk.
Parameter
Remarks
Off
Write through
On*
Write back
* Recommended.
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
Remarks
Off
Does not perform read ahead.
On*
Performs read ahead.
* Recommended
(6)
Span
:
Specify the span.
This server does not use this feature.
