Dell POWERVAULT MD3600I - Manual (Page 88)

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.
Using the following command: # umount filesystemDirectory
2. Run the following command to display multi-pathing topology:
# multipath -ll
NOTE: Use the multipath -ll command:
– If a new LUN is mapped, the new LUN is detected and given a multipathing device node.
– If you increased volume capacity, the new capacity is displayed.
NOTE: The virtual disk that you want to delete from the mapping. For example, the following information may
be displayed:
mpath6 (3600a0b80000fb6e50000000e487b02f5) dm-10
DELL, MD32xx
[size=1.6T][features=3 queue_if_no_path
pg_init_retries 50][hwhandler=1 rdac]
\_ round-robin 0 [prio=6][active]
\_ 1:0:0:2 sdf 8:80 [active][ready]
\_ round-robin 0 [prio=1][enabled]
\_ 0:0:0:2 sde 8:64 [active][ghost]
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