208 Chapter 3
Command Definitions C-E
DOWN
DOWN
Removes a device from normal system use. This command does not apply to the system
console or to disk drives.
Syntax
DOWN ldev
Parameters
ldev The logical device number of the device being taken offline.
Operation Notes
When the DOWN command is issued for a device that is in use, the request is responded to
when the process currently accessing it releases the device.
The system console cannot be taken down. Any attempt to do so results in the following
error message:
DOWN NOT PERFORMED ON CONSOLE DEVICE (CIERR 3150)
CAUTION When any device is powered down without the use of the DOWN command,
subsequent access to that device can result in indefinite waiting, erroneous
transfers, or other incorrect operation. Often these failures occur with no
indication to the system operator or to the user. For this reason, it is very
important that every device that is not fully operational (especially those that
are powered down) be taken down with the DOWN command. A device that will
be inoperable for more than a few hours can be temporarily removed from the
I/O configuration at system startup.
Use
This command may be issued from a session, job, program, or in BREAK. Pressing Break
has no effect on this command. It may be used only from the console unless distributed to
users with the ALLOW or ASSOCIATE command.
Example
To take logical device number 7 offline, enter:
DOWN 7
To take logical device number 10 (an input-spooled, job-accepting magnetic tape) offline,
enter:
DOWN 10
STOPSPOOL 10
11:16/31/SP#10/STOPPED
11:16/31/LDEV#10 NOT READY
