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Chapter 6 RAID Group Management
6.2 Functions in the Action Area for RAID Group
6.2.4
Change Controlling CM
This function changes the controlling CM that is allocated to the RAID group.
Unequal loading between the CMs can be resolved by changing the controlling CM.
The procedure to change controlling CM of the RAID group is as follows:
Procedure
1
•
During controlling CM change, the device status is changed from Write
Back mode to Write Through mode. Consider the workload when
changing controlling CM.
•
This function cannot be used under the following conditions:
-
When two CMs are installed in the ETERNUS DX Disk storage
system, and status for one or both of the CMs is not "ONLINE"
-
When formatting or LUN Concatenation is being performed in the
volumes that are registered in the target RAID group
-
When encryption is being performed in the target RAID group
-
When the target RAID group status is not "Available"
-
When rebuild, copyback, or redundant copy is being performed in the
target RAID group
-
When LDE is being performed in the ETERNUS DX Disk storage
system
-
When RAID migration is being performed in the ETERNUS DX Disk
storage system
-
When a RAID group diagnosis is being performed in the ETERNUS
DX Disk storage system
-
When a disk diagnosis is being performed in the ETERNUS DX Disk
storage system
-
When balancing Thin Provisioning Volume is being performed in the
ETERNUS DX Disk storage system
This function can also be used for changing the controlling CM of the RAID
groups that configure a Thin Provisioning Pool (TPP).
Select the RAID group to change the controlling CM (multiple selections can be
made) and click [Change Controlling CM] in [Action].
ETERNUS Web GUI User's Guide
Copyright 2011 FUJITSU LIMITED
125
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