Changing The Raid Level Of A Disk Group; Removing A Host-To-Virtual Disk Mapping Using Linux Dmmp - Dell PowerVault MD3260i Administrator's Manual

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.

Changing The RAID Level Of A Disk Group

Changing the RAID level of a disk group changes the RAID levels of every virtual disk that comprises the disk group.
Performance may be slightly affected during the operation.
Guidelines to change the RAID level of a disk group:
• You cannot cancel this operation after it begins.
• The disk group must be in Optimal status before you can perform this operation.
• Your data remains available during this operation.
• If you do not have enough capacity in the disk group to convert to the new RAID level, an error message is
displayed, and the operation does not continue. If you have unassigned physical disks, use the Storage → Disk
Group → Add Physical Disks (Capacity) option to add additional capacity to the disk group and then retry the
operation.
To change the RAID level 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 → RAID Level.
3. Select the appropriate RAID level and click Yes to confirm the selection.
The RAID level operation begins.

Removing A Host-To-Virtual Disk Mapping Using Linux DMMP

To remove a host-to-virtual disk mapping using Linux DMMP:
1. Unmount the file system containing the virtual disk.
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