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Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

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Changing the RAID controller module ownership of a disk group

You can change the RAID controller module ownership of a disk group. You can also change the RAID controller module ownership of a standard virtual disk or a snapshot repository virtual disk. You cannot directly change the RAID controller module ownership of a snapshot virtual disk because the snapshot virtual disk inherits the RAID controller module owner of its associated source virtual disk. Changing the RAID controller module ownership of a virtual disk changes the preferred RAID controller module ownership of the virtual disk.

During a virtual disk copy, the same RAID controller module must own both the source virtual disk and the target virtual disk. Sometimes both virtual disks do not have the same preferred RAID controller module when the virtual disk copy starts. Therefore, the ownership of the target virtual disk is automatically transferred to the preferred RAID controller module of the source virtual disk. When the virtual disk copy is completed or is stopped, ownership of the target virtual disk is restored to its preferred RAID controller module. If ownership of the source virtual disk is changed during the virtual disk copy, ownership of the target virtual disk is also changed. Under certain operating system environments, it may be necessary to reconfigure the multi-path driver before an I/O path can be used.
To change the RAID controller module ownership of a disk group:
  1. In the AMW, select the Storage & Copy Services tab and select a disk group.
  2. From the menu bar, select Storage > Disk Group > Change > Ownership/Preferred Path.
  3. Select the appropriate RAID controller module slot and click Yes to confirm the selection.
    CAUTION: Possible loss of data access—Changing ownership at the disk group level causes every virtual disk in that disk group to transfer to the other RAID controller module and use the new I/O path. If you do not want to set every virtual disk to the new path, change ownership at the virtual disk level instead.
    The ownership of the disk group is changed. I/O to the disk group is now directed through this I/O path.
    NOTE: The disk group may not use the new I/O path until the multi-path driver reconfigures and recognizes the new path. This action usually takes less than 5 minutes.
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