MAP 0291: Missing Device or Bus Problem Resolution

Purpose of this MAP

Use this MAP when a bus or device (such as a disk drive) is reported as a missing resource by the diagnostics.

• Step 0291-1

  The device may be missing because of a power problem.

  If the missing device is located in a drawer or enclosure, do the following:

  1. Check for any environmental problem indicators such as power or cooling that may indicate a problem. (if needed, refer to the service documentation.)
  2. If a problem is indicated, follow the service documentation to resolve the problem.

  Go to Step 0291-2.

• Step 0291-2

  Inspect the cables (signal and power) of the missing device. Be sure all connections are in place and power is present. Refer to the system or enclosure documentation containing the power wiring diagram or system cable diagram to locate specific cables, determine the cable numbering, and check for a problem-determination procedure. Look for obvious power cabling problems, such as missing or loose cable connectors.

  Power problems can sometimes be identified by checking other devices that use the same power source (such as a diskette drive and a SCSI tape drive, even though they have different controllers). If other devices that share a power source are reported as missing devices, suspect the power source as the problem.

  If there is a power problem, refer to Power problems.

  Did you find a problem?

  NO

  Go to Step 0291-3.

  YES

  Correct the problem, then go to Verifying a repair.

• Step 0291-3

  Is the missing device a SCSI device installed in a SCSI Enclosure Services (AIX^(R) resource SESx) or SAF-TE (AIX resource SAFTEx), or a SCSI device installed in either type of enclosure?

  NO

  Go to General problem resolution.

  YES

  Go to Step 0291-4.

• Step 0291-4

  Run the advanced diagnostics in problem determination mode on the SCSI Enclosure Services or SAF-TE device.

  Note:
  A no trouble found result, or if you get another SRN with the same digits before the dash as you previously had from the diagnostics, indicates that you did NOT get a different SRN.

  Did you get a different SRN than when you ran the diagnostics previously?

  NO

  Go to Step 0291-5.

  YES

  Take the following action:

  1. Look up the SRN.
     Note:
     If the SRN is not listed a Service Request Number Lists, look for additional information in the following:
     • Any supplemental service manual for the device.
     • The diagnostic Problem Report screen.
     • The Service Hints service aid in Running the online and eServer stand-alone diagnostics.
  2. Perform the action listed.

• Step 0291-5

  Power off the system. Disconnect all hot-swap devices attached to the adapter. Reconnect the hot-swap devices one at time. After reconnecting each device, do the following:

  1. Power on the system and boot the system in the same mode that you were in when you received the symptom that led you to this MAP Powering on and powering off.
  2. At an AIX command prompt, run a (diag -a) to check for missing options.
  3. Verify that the device you just added to the system is present in the system configuration. If other devices are now missing, the problem may be with the last device that was reconnected or reinstalled. Perform these substeps:
     1. If the device that was just reinstalled in the system is missing, or if additional devices are now missing, replace the last device that was reinstalled.
     2. Rerun diag -a to check for missing options.
     3. If devices are no longer missing, go to Verifying a repair. Otherwise, contact your support center.
        Note:
        A device problem can cause other devices attached to the same SCSI adapter to go into the defined state. Ask the system administrator to make sure that all devices attached to the same SCSI adapter as the device that you replaced are in the available state.
  4. If no devices were missing, the problem could be intermittent. Make a record of the problem. Running the diagnostics for each device on the bus may provide additional information. If you have not replaced FFCs B88, 190, and 152 go to General problem resolution, using FFCs (in order): B88, 190, and 152.