Removes a device from normal system use. This command does
not apply to the system console or to disk drives. (CM)
ldev The logical device number of the device being
When you issue the DOWN command for a device that is in
use, the request will be satisfied when the process
currently accessing it releases it.
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 commands.
This command does not apply to disks, or to the system console.
Any attempt to take the console down will produce the following
DOWN NOT PERFORMED ON CONSOLE DEVICE (CIERR 3150)
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
will 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 downed
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
To take logical device number 7 offline, enter
To take logical device number 10 (an input spooled, job
accepting magnetic tape) offline, enter
1116/31/LDEV#10 NOT READY
Commands: SHOWDEV, UP