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128 Configuration: Disk Groups and Virtual Disks
4
In
Logical unit number
, select the appropriate LUN.
The drop down list shows only the currently available LUNs that are
associated with the selected virtual disk.
5
Click
OK
.
Stop any host applications associated with this virtual disk, and unmount
the virtual disk, if applicable, from your operating system.
6
In the
Change Mapping
dialog, click
Yes
to confirm the changes.
The mapping is checked for validity and is saved. The
Defined Mappings
pane is updated to reflect the new mapping. The
Topology
pane is also
updated to reflect any movement of host groups or hosts.
NOTE: If a password is set on the storage array, the Enter Password dialog is
displayed. Type the current password for the storage array, and click OK.
7
If configuring a Linux host, run the
rescan_dm_devs
utility on the host,
and remount the virtual disk if required. This utility is installed on the host
as part of the MDSM install process.
8
Restart the host applications.
Changing 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 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,
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