Dell PowerVault MD3820f - Manual (Page 106)

• You cannot cancel this operation after it begins.
• The disk group must be in Optimal status before you can perform this operation.
• Your data is 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]
In this example, the mpath6 device contains two paths:
-- /dev/sdf at Host 1, Channel 0, Target 0, LUN 2
--/dev/sde at Host 0, Channel 0, Target 0, LUN 2
3. Flush the multi-pathing device mapping using the following command:
# multipath -f /dev/mapper/mapth_x
Where, mapth_x is the device you want to delete.
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