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

Modifying and removing host-to-virtual disk mapping

You can modify or remove a host-to-virtual disk mapping for several reasons, such as an incorrect mapping or reconfiguration of the storage array. Modifying or removing a host-to-virtual disk mapping applies to both hosts and host groups.

1. In the AMW, select the Host Mappings tab.
2. In the Defined Mappings pane, perform one of these actions:
   • Select a single virtual disk, and select Host Mappings > LUN Mapping > Change.
   • Right-click the virtual disk, and select Change from the pop-up menu.
3. In the Host group or host list, select the appropriate host group or host.
   By default, the drop-down list shows the current host group or the host associated with the selected virtual disk.
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.
   NOTE: 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 object tree is also updated to reflect any movement of host groups or hosts.
7. 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.
8. If configuring a Linux host, run the rescan_dm_devs utility on the host, and remount the virtual disk if required.
   NOTE: This utility is installed on the host as part of the MD Storage Manager install process.
9. Restart the host applications.