The XSET command allows you to specify the method by which
XRC selects utility devices for use in reading data from a storage
control. You can choose that a specific device be used. This
is known as a fixed device. Or you can allow the storage control to
determine which utility device to use. This is known as a floating
device.
The utility device method is controlled through the XSET command,
and the utility device to be used is specified using the XADDPAIR
command with the secondary volser of XRCUTL. The UTILITY parameter
of the XSET command, when used in conjunction with the XADDPAIR command,
allows you to:
- Set up a storage control session to use a particular device as
a fixed utility device.
- Change to a different fixed utility device for a storage control
session.
- Disable the fixed utility support for a particular storage control
session and return to the default floating utility device support.
Note: Be aware that issuing the XSET command with the UTILITY
parameter specified does not activate or deactivate fixed utility
device support. This support is enabled when you issue an XADDPAIR
command with a secondary volser of XRCUTL.
For additional information about utility devices, refer to Fixed utility devices and Floating utility devices.