z/VM: CP Commands and Utilities Reference - z/VM - IBM

DISCONNECT
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DISConnect
Authorization
Purpose
Operands
Usage Notes
HOld
Privilege Class: Any
Use DISCONNECT to disconnect your display from the host system without
stopping operations in your virtual machine.
HOld
causes the non-SNA TTY display terminal telecommunication connection to
remain in effect after your session is disconnected. If you specify the HOLD
option from a logical device, you disconnect from the logical device without
losing the connection between the logical device and the system.
1. Once you have issued DISCONNECT, you remain disconnected until you enter
the LOGON command. If you have a functional secondary user, that user
receives your messages and can enter commands and responses for you. If
your virtual machine goes into a disabled wait state, or if a read is posted from
the virtual machine or from CP, and you do not have a functional secondary
user, you have an installation-defined grace period (usually 15 minutes) in which
to log on, or your virtual machine is automatically logged off. If you do not have
a functional secondary user, and your virtual machine is in disconnect mode, all
“writes” or output messages sent to your virtual console are ignored unless you
have issued the CP command SPOOL CONSOLE START.
2. If your connection is broken because of console errors, and you do not have a
functional secondary user, CP places your virtual machine in disconnect mode
for an installation-defined grace period (usually up to 15 minutes). Your virtual
machine does not continue to run unless you have previously issued SET RUN
ON, and you must log on within the grace period if you want to continue
operations on your virtual machine.
3. An error message, without a message ID, is issued when the system
disconnects a terminal because of an I/O error.
For example:
11:19:20 GRAF 0AB3 DISCONNECT ETC18566 USERS = 59 FORCED BY SYSTEM
DISCONNECT
4. When your virtual machine is reconnected using the usual logon procedure, it is
placed in CP console function mode. To resume execution on your virtual
machine, enter the BEGIN command.
5. If you specify the HOLD option on an SNA/CCS terminal, the command is not
valid and an error message is issued. If you specify the HOLD option on a
non-SNA TTY terminal, or a logical terminal, it is accepted and processed. The
HOLD option is accepted but ignored on all other terminals.
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Chapter 2. CP Commands 279