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Chapter 6 RAID Group Management
6.2 Functions in the Action Area for RAID Group
The procedure to change the RAID group parameters is as follows:
Procedure
1
2
When the "Rebuild Priority" value is changed, the priority is changed not
only for a rebuild, copyback, and redundant copy that will be performed
after the setting is changed, but also for any rebuild, copyback, and
redundant copy operations that are currently being performed.
Select which RAID groups to change the RAID group parameters for (multiple
selections can be made) and click [Modify RAID Group Parameters] in [Action].
Specify the rebuild priority after changing, and click the [Modify] button.
•
DCMF
Specify the DCMF between 1 - 10. The default DCMF value is "1".
The maximum number of commands issued to a disk is changed to a multiple
represented by the specified value. When not changing the DCMF, select "No Change".
The higher the DCMF value is, the more disk throughput is available, improving
sequential performance. Note that high DCMF value may result in a high load on the
disk, decreasing performance.
•
Rebuild Priority
Specify the rebuild priority value. The default "Rebuild Priority" is "Low".
When not changing the rebuild priority, select "No Change".
Rebuild, copyback, and redundant copy performance may be improved by specifying a
larger "Rebuild Priority" value. Note that specifying larger "Rebuild Priority" may cause
the degradation of RAID group performance when performing rebuild, copyback, or
redundant copy is performed in the target RAID group.
-
Low
Perform rebuild, copyback, and redundant copy with a normal priority.
-
Middle
Give priority to rebuild, copyback, and redundant copy over host access.
→ A confirmation screen appears.
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