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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.
Cautions:
•
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 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.
•
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 the local and
external storage systems, and uses ShadowImage 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 ShadowImage pairs (pairsplit operation). For details on the
pairsplit operation, see the ShadowImage 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.
Cautions: Make sure that the power supply of the external storage system
is completely off.
Hitachi Universal Storage Platform V/VM Universal Volume Manager User's Guide
Performing Universal Volume Manager Operations
5-33
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