crash(8)                   DG/UX 4.30                    crash(8)



     NAME
          crash - what to do when the DG/UX System crashes

     DESCRIPTION
          This entry tells you what to do if the system crashes.  Two
          kinds of crashes can occur:  panics and hangs.  A panic, a
          system-detected crash, sends a panic message to the
          operator's console.  A hang, a crash not detected by the
          operating system, is an infinite loop or a deadlock.

        How to shut the system down
          If your system panics, be sure to record the panic number.
          Then dump the system memory as described below in "Taking
          System Dumps."  You will automatically enter the system dump
          dialogue.

          If your system halts, type START 1000 at the SCM (prom)
          prompt.  This command puts you in the system dump dialogue.
          Take a dump of the system memory as described below in
          "Taking System Dumps."

        Taking System Dumps
          If your system panics, you will automatically enter the
          system dump dialogue.  If the problem is a system halt or
          hang, you will have to manually enter the dialogue as
          described above.  The dialogue will read as follows:

          Do you want to take a system dump? [Y]

          You will be prompted for the dump device in DG/UX common
          device specification format; you can override the default
          device if desired (for diskless workstations, the device is
          inen(0)):

          Dump destination device? [st(cisc(),4)]

          You will then be prompted to mount a tape:

          Mount tape.  Type newline when tape is ready.

          If the system memory image is too large to fit on one tape,
          you will be prompted to load subsequent tape volumes:

          Tape volume 1 completed.
          Mount tape.  Type newline when tape is ready.

          If any tape volume write fails, you will be allowed to
          restart the dump at the beginning of that volume:

          Hard error on tape volume 1.  Restarting volume from checkpoint.
          Mount tape.  Type newline when tape is ready.




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     crash(8)                   DG/UX 4.30                    crash(8)



          The final volume will be rewound upon completion of the
          dump:

          System dump completed successfully.

          In all cases, when you provide a dump, you should also
          provide a copy of the tailored system image (usually named
          /dgux) that was running at the time of the crash.  This
          image contains vital information necessary for
          interpretation of the memory dump; the memory dump is
          useless without the system image.  See the "DG/UX System
          Release Notice" on how to send dumps to Data General.

     SEE ALSO
          cp(1), crash(1M), fsck(1M).
          Installing and Managing the DG/UXTM System







































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