Visara Master Console Center Operations Guide - Manual (Page 73)

Appendix B MVS Mainframe Console Operation Basics
Operations Guide 73
Use the MVS command “D C” to see all the consoles that are currently assigned. Do this from
the MASTER console, or the console on which the message(s) appeared indicating that a console
was “backed up”. The numbers in the left-most portion of the line displays are the console IDs.
The numbers that follow the “/” (if any) are the alternate console IDs (the IDs of the console(s)
that are used to receive messages if the console whose ID to the left of the “/” fails).
At the same time, check the NBUF= value. A number that is in the hundreds (or thousands)
normally indicates a problem (especially if a “backed up” message has appeared). It is that
specific console (the high NBUF= console) whose ID is required if using the “K Q” type
recovery. Now, assuming the console that is backed up has an ID of 03, and the console that is
working) has an ID of 01, issue:
K Q,R=01,L=03
The messages that were “backed up” on console 03 will now be presented on console 01.
Earlier, it was suggested that issuing a VARY ONLINE is an easy way to escape from the
“backed up” problem. If you have not issued that command prior to issuing the “K Q” command,
it should (normally) be issued after the “K Q” command, because if a console is “backed up”,
there must be some sort of problem (for example, cable, or controller.). Issuing a “VARY
ONLINE” causes the console to go “out of service”, and the “alternate console” (if any) begins to
receive the messages originally destined for the “out of service” console. Issuing the “K Q” will
alleviate the problem, but it is most likely that manual intervention will be required to actually fix
the problem. If this is the case, the console should be put ONLINE (or taken OFFLINE) until the
problem is resolved, so another backup does not occur during problem resolution time. Issuing
the “K Q” prior to the offline command simply guarantees that the messages that were “backed
up” are not lost (assuming the R= console is available).