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Chapter 6 RAID Group Management
6.2 Functions in the Action Area for RAID Group
ETERNUS Web GUI User’s Guide
Copyright 2013 FUJITSU LIMITED P2X0-1090-10ENZ0
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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 Select the RAID group to change the controlling CM (multiple selections can be made) and
click [Change Controlling CM] in [Action].
• While changing the controlling CM, the storage system status is changed from Write Back mode to Write
Through mode, reducing the I/O performance for the ETERNUS DX Disk storage system. Perform this
function when there are not many I/O operations. Changing the controlling CM may take up to 20 or 30
minutes.
• Changing the controlling CM for RAID groups that configure FTRPs is not available.
• This function cannot be used under the following conditions:
- When a CM that is not in " Normal" status exists
- 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 TPV is being performed in the ETERNUS DX Disk storage system
- When balancing FTRP is being performed in the ETERNUS DX Disk storage system
- When pinned data exists 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).