Recover from IPL or system failures

Use this procedure to help recover from IPL or system failures.

If the system is logically partitioned, references to the system, console, displays, system commands, and system values are relative to the partition having a problem.

References to the control panel refer to the "Work with partition" status display functions if the problem is in a secondary partition, or the actual control panel if the problem is in the primary partition. If your system has logical partitions, see the Troubleshoot logical partitions topic.

Verify the following conditions:
  • The device from which you performed the IPL is powered on.
  • The tape and CD-ROM are loaded correctly.
  • The sign-on user ID and password are correct.
  • The system is set to the correct mode (Manual, Normal, Auto, or Secure).
  • If this is a timed IPL, the system value for date/time and control panel mode is set correctly .
  • If this is a remote IPL, the telephone, modem, control panel mode, and QRMTIPL value are set up correctly .

After you have checked for these conditions, perform the following steps:

  1. Perform an IPL from the control panel or Operations Console Remote Control panel using the following steps:
    1. Set the system to the Manual mode.
    2. Choose from the following conditions:
      • If the system is turned on, select Function 03 and press Enter to start an IPL.
      • If the system is turned off, ensure that the control panel is in either Normal or Manual mode and power on the system.
  2. Sign on to the system when the Sign On display appears, and then continue with step 3. If you do not see the Sign On display, check to see if you have a new system reference code (SRC):
  3. On the IPL Options display, specify Yes for the following parameters:
    • Define or change the system at IPL
    • Clear output queues
    • Clear job queues
    • Clear incomplete job logs
  4. Change the system value for QMCHPOOL to a smaller value.
  5. Make sure the system value for QCTLSBSD has the correct spelling, or assign an alternative controlling subsystem.
  6. Change the system value for QPWRDWNLMT to a larger value.
  7. Continue the IPL process. If the same failure occurs, set the system to the Normal mode, and then contact your hardware service provider.
Parent topic: Problem analysis procedures
Related concepts
Troubleshoot logical partitions