Turning on or off only the external storage system, Turning on or off only the local storage system – HP XP External Storage Software User Manual
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For the procedure to execute the Check Paths & Restore Volume command, see
Checking Connection Status and Resuming External Volume Operation
Note:
When the Check Paths & Restore Volume 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 on purpose):
1.
Stop the read or write I/O to the external volume that is mapped as a local storage system
internal volume and is contained in the external storage system that you want to turn off.
2.
Execute the Disconnect Subsystem 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).
For the procedure to execute the Disconnect Subsystem command, see
Disconnecting External Storage System or Disconnecting External Volume
3.
Perform other operations that are required before turning off the local storage system, if there is
some.
4.
Turn off the power supply of the external storage system.
Caution:
After you have executed the Disconnect Subsystem command, but you need to use the mapped
external volume again, execute the Check Paths & Restore Volume command.
•
To turn on the power supply of the external storage system to restart from the turned off status:
1.
Turn on the external storage system that contains the external volume, which is mapped as
an internal volume.
2.
Execute the Check Paths & Restore Volume command of the External Storage.
For the procedure to execute the Check Paths & Restore Volume command, see
Checking Connection Status and Resuming External Volume Operation
Caution:
When the external storage system is turned off after the Disconnect Subsystem command is
executed, you cannot access the mapped external volume from the local storage system as you just turn
the external storage system on. It is necessary to execute the Check Paths & Restore Volume command to
resume using the mapped external volume. The Check Paths & Restore Volume command checks the
defined information and the actual status of the external volume mapped as an internal volume. If the
external volume is ready to be used as a mapped volume, the volume is set to accept the I/Os and you
can resume using the volume as a mapped volume.
Turning On or Off Only the Local Storage System
•
To turn off the power supply of the local storage system (to turn off on purpose):
1.
Stop the read or write I/O to the external volume that is mapped as a local storage system
internal volume.
2.
Perform other operations that are required before turning off the local storage system, if there is
some.
3.
Turn off the power supply of the local storage system.
Note:
As you turn off the power supply of the local storage system, all the data, which is for the external
volume, in the local cache memory is written in the external volume (all the data is destaged).
•
To turn on the power supply of the local storage system to restart from the turned off status:
1.
Turn on the external storage system that contains the external volume, which is mapped as
an internal volume.
2.
Turn on the power supply of the local storage system.
Caution:
When the local storage system is turned off after the Disconnect Subsystem command is
executed, you cannot access the mapped external volume from the local storage system as you just turn
88
Performing External Storage Operations