Use the following form of the VARY command to change the automatically
switchable characteristic (or the AUTOSWITCH attribute) of a tape
device. The setting does not persist beyond the duration of the IPL.
VARY AUTOSWITCH is not valid for tape devices that are:
- Online. For a device that is online, issue the VARY OFFLINE command
before you issue VARY AUTOSWITCH.
- Managed by JES3.
V {(devspec[,devspec]...)},{[AUTOSWITCH|AS][,ON|OFF]}
|
- devspec
- devspec is one of the following:
- [/]devnum
- The device is not assign capable.
- lowdevnum-highdevnum
- lowdevnum is the lower bound of a range of device numbers. highdevnum is
the upper bound of the range.
A device number is 3 or 4 hexadecimal digits.
- AUTOSWITCH or AS
- The system is to turn on or off the AUTOSWITCH attribute of
the tape device or range of tape devices you specified.
If you
specify the VARY AUTOSWITCH command for a tape device that is online
or managed by JES3, the system alerts you to the error.
- If you specify a list of devices (for example, VARY (281,2822,283),AS,ON),
the system returns a message for each device that is not valid.
- If you specify a range of devices (for example, VARY (281-283),AS,ON),
you receive a DISPLAY command response that lists the status (including
the AUTOSWITCH status) for devices in the specified range.
For more information about automatically switchable tape
devices, see z/OS MVS Setting Up a Sysplex.
- ON
- The system is to turn on the AUTOSWITCH attribute for the device
or devices you specified.
- OFF
- The system is to turn off the AUTOSWITCH attribute for the device
or devices you specified.
Example 1:
To turn on the AUTOSWITCH attribute for tape devices 282, 283,
and 287, enter:
VARY (282,283,287),AS,ON