Turning on or off both storage systems – HP XP External Storage Software User Manual
Page 89
the local 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 if the
defined information and the actual status of the external volume mapped as an internal volume match. 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.
Caution:
When the Disconnect Subsystem command or the Disconnect Volume command is executed and
all the data in the cache memory is written to the external volume, the displayed information for Ext.
VOL Status in the Volume Operation window becomes Disconnect.
Turning On or Off Both Storage Systems
This section explains how to turn on or off the power supply of both the local storage system and the
external storage system taking the case where Business Copy is used as an example.
•
To turn off the power supply of both storage systems:
1.
Stop the read or write I/O to the local storage system.
All read and write I/Os with Fibre Channel connections should be stopped.
2.
Split all Business Copy pairs (pairsplit operation).
For details on the pairsplit operation, see the HP StorageWorks XP24000 Business Copy
Software User’s Guide.
3.
Turn off the power supply of the local storage system.
Caution:
Make sure that the power supply of the local storage system is completely off and
then go on to the next step.
4.
Turn off the power supply of the external storage system.
Caution:
Make sure that the power supply of the external storage system is completely off.
•
To turn on the power supply of both storage systems:
1.
Turn on the power supply of the external storage system.
Caution:
Make sure that the power supply of the external storage system is completely on and
then go on to the next step.
2.
Turn on the power supply of the local storage system.
Caution:
Make sure that the power supply of the local storage system is completely on and
then go on to the next step.
3.
Resynchronize all Business Copy pairs (pairresync operations).
For details on the pairresync operation, see the HP StorageWorks XP24000 Business Copy
Software User’s Guide.
4.
Start the read or write I/O to the local storage system.
All read and write I/Os with Fibre Channel connections should be started.
Disconnecting External Storage System or Disconnecting
External Volume
The Disconnect Subsystem command and the Disconnect Volume command allow you to disconnect the
external volume. You need to disconnect the external volume(s), for example, before you turn the power
supply off of the local storage system or the external storage system for maintenance, or before you
delete the external volume mapping.
As you execute the Disconnect Subsystem command or the Disconnect Volume command, the acceptance
of the host I/O to the mapped external volume is stopped and all the data in the cache memory is written
into the external volume (all the data is destaged).
The settings of the mapping are preserved, even though the external volume is disconnected using
the Disconnect Subsystem command or the Disconnect Volume command. Therefore, you can resume
using the external volume as a mapped volume with the former settings, even though once you have
disconnected the external volume. For the procedure to resume using the disconnected external volume,
see “
Checking Connection Status and Resuming External Volume Operation
XP24000 External Storage Software User’s Guide
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