HP StorageWorks External Storage XP user guide (T1706-96006, June 2006)

100 Configuring external LUs
Disconnecting external LUs individually (Disconnect Volume)
1. In the LU Operation pane, select an external LU group number in the Device tree. Information about
external LUs in the selected external LU group appears in the Device list.
2. In the Device list, right-click the external LU you want to disconnect from the local array, and select
Disconnect Volume. The selected external LU group number in the Device tree and the selected external
LU in the Device list appear in blue italics. It also appears in the Preset list.
To check details of the intended operation, right-click the row in the Preset list, and select Detail. To
cancel settings, right-click the row in the Preset list, and select Delete.
3. Click Apply. A confirmation message appears.
4. Click OK. The Ex-Dev.Status column in the Device list changes to Cache Destaging. When External
Storage XP finishes writing data from cache to the external LU, the Ex-Dev. Status column changes to
Disconnect.
If errors occur during disconnect operations, failed operations and error codes appear in the Preset list.
To check error messages, right-click the failed operation row, and select Detail.
CAUTION: To access the external LU after executing the Disconnect Subsystem command, you must
execute the Check Paths & Restore Vol. command.
Checking the connection status and resuming external LU operations
(Check Paths & Restore Vol.)
When errors occur in the path between the local array and external array, and also in all alternate paths,
the local array changes the external LU’s status to Blockade. In this case, see ”Troubleshooting External
Storage XP” on page 121 and restore the path to the external array according to the troubleshooting
procedure. Execute the Check Paths & Restore Vol. command to make the external LU in Blockade status
usable.
When executing the Check Paths & Restore Vol. command for the disconnected external LU for which
mapping settings are preserved, the defined mapping setting and the external LU’s current status are
compared and checked to see if the settings match the actual status. The path status and all other mapping
configuration definitions are checked. If the external LU can be resumed as a mapped volume as a result of
the checking processing, the volume status is set to be available for I/O operations.
Use the Check Paths & Restore Vol. command to resume using an external LU that has been disconnected
using the Disconnect Subsystem or Disconnect Volume command.
CAUTION: After executing the Check Paths & Restore Vol. command, click the Refresh button ( ) on the
Command View XP or XP Remote Web Console main pane to update the information, and check the
current progress status.
NOTE: If you execute the Check Paths & Restore Vol. command and the external LU is ready to be
restored as the mapped LU, the external LU is set to accept I/Os and you can resume using the external LU
as a mapped LU. However, if the external LU is not ready to be resumed, the status of the disconnected
volume remains Blockade.
Restoring all external LUs in an external array (Check Paths & Restore Vol.)
1. In the LU Operation pane, select External Devices in the Device tree. Physically connected external
arrays appear in the Device list.
2. In the Device list, right-click the external array you want to restore the connection to the local array, and
select Check Paths & Restore Vol. The selected external array appears in blue italics in the LU list and
Device list. It also appears in the Preset list.