HP XP P9500 Storage - Manual (Page 47)

To execute the Disconnect External Storage Systems command, see “Disconnecting external storage
system or external volume” (page 50) .
NOTE: When you want to perform the same processing of the Disconnect External Storage
Systems command on an individual volume, you can use the Disconnect External Volumes command.
If you want to delete the external volume mapping individually, you first need to execute the
Disconnect External Volumes command and then the Delete External Volumes command.
Reconnect External Storage Systems command
The Reconnect External Storage Systems command checks if the defined information about the
mapped external volume and the actual external volume status match. If the external volume can
be used as the mapped volume as the result of the check, the external volume is set to accept the
I/Os, and you can continue using the external volume as a mapped volume.
The Reconnect External Storage Systems command can be used to restore the external volume,
which is set to reject the host I/O by the Disconnect External Storage Systems command.
If an error occurs in the path, firstly remove the error in the path to make the path restorable, and
then execute the Reconnect External Storage Systems command.
To execute the Reconnect External Storage Systems command, see “Checking connection status
and resuming external volume operation” (page 52) .
NOTE: When you want to perform the same processing of the Reconnect External Storage Systems
command on an individual volume, you can use the Reconnect External Volumes command.
When the Reconnect External Storage Systems command or the Reconnect External Volumes
command is executed and the external volume is ready to be restored as the mapped volume, the
external volume is set to accept the I/Os and you can resume using the external volume as a
mapped volume. However, if the external volume is not ready to be restored, the external volume
status remains blocked.
Turning on or off only the external storage system
To turn off the power supply of the external storage system (to turn off purposely):
1. Stop the read or write I/O to the external volume that is mapped as a local storage system
internal virtual volume and is contained in the external storage system that you want to turn
off.
2. When you define an external volume as a THP pool volume, block all V-VOLs for maintenance.
If you do not have any external volumes defined as THP pool volumes, go to step 3.
To block all V-VOLs in the pool at once:
a.
Click Pools in the Storage Systems tree.
The list of available pools appears in the tree.
b. In the tree, select a pool to be blocked.
c. Click the Virtual Volumes tab.
d. Click Select All Pages.
e. From the menu bar, select Actions
→Logical Device→Block LDEVs.
The Block LDEVs window opens.
f. Confirm the settings and enter the task name in the Task Name box.
g. Click Apply in the Confirm window.
3. Execute the Disconnect External Storage Systems command for the external storage system
that you want to turn off.
The additional I/O to the external volume is stopped and all the data in the local cache
memory is written in the external volume (all the data is destaged).
Turning on or off the storage system 47