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Note: When you want to perform the same processing of the Disconnect
Subsystem command on individual volume, you can use the Disconnect
Volume command. If you want to delete the external volume mapping
individually, you first need to execute the Disconnect Volume command and
then the Delete Volume command.
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Check Paths & Restore Volume command
The Check Paths & Restore Volume 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 Check Paths & Restore Volume command can be used to restore
the external volume, which is set to reject the host I/O by the Disconnect
Subsystem command or the Disconnect Volume command, as the
mapped volume. The Check Paths & Restore Volume command can be
executed for both the whole storage system and for the individual volume.
If an error occurs in the path, firstly remove the error in the path to make
the path restorable, and then execute the Check Paths & Restore
Volume command.
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).
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.
Hitachi Universal Storage Platform V/VM Universal Volume Manager User's Guide
Performing Universal Volume Manager Operations
5-31
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