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

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Changing RAID controller ownership of the virtual disk

If the host has a single data-path to the MD storage array, the virtual disk must be owned by the RAID controller to which the host is connected. You must configure this storage array before you start I/O operations and after the virtual disk is created. You can 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 ownership of the virtual disk to the connected controller:
  1. In the AMW, select the Storage & Copy Services tab and select a virtual disk.
  2. From the menu bar, select the appropriate RAID controller module slot in Storage > Virtual Disk > Change > Ownership/Preferred Path.
  3. Click Yes to confirm the selection.
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