7031-D24 or 7031-T24 Maintenance analysis procedures

These maintenance analysis procedures (MAPs) describe how to analyze a continuous failure that has occurred in a 7031-D24 or 7031-T24 that contains one or more SCSI disk drive modules. Failing FRUs of the 7031-D24 or 7031-T24 can be isolated with these MAPs.

For more information on additional tools to identify missing resources on Linux®, go to Linux tools.

Using the MAPs

Attention: Do not remove power from the host system or 7031-D24 or 7031-T24 unless you are told to in the instructions that you are following. Power cables and external SCSI cables that connect the 7031-D24 or 7031-T24 to the host system can be disconnected while that system is running.

To isolate the FRUs in the failing 7031-D24 or 7031-T24, perform the following actions and answer the questions given in these MAPs:

When instructed to exchange two or more FRUs in sequence:
1. Exchange the first FRU in the list for a new one.
2. Verify that the problem is solved. For some problems, verification means running the diagnostic programs (see the using system service procedures).
3. If the problem remains:
  1. Reinstall the original FRU.
  2. Exchange the next FRU in the list for a new one.
4. Repeat steps 1.b and 1.c until either the problem is solved, or all the related FRUs have been exchanged.
5. Perform the next action that the MAP indicates.
See 7031-D24 or 7031-T24 Disk-drive enclosure LEDs for locations and descriptions of the LEDs and switches.

Attention: Disk drive modules are fragile. Handle them with care, and keep them well away from strong magnetic fields.

Linux tools

Use the lscfg command to list all the resources that are available at start up. This information is also saved at each start up and you can use it to identify any missing resources.

To determine if any devices or adapters are missing, compare the list of found resources and partition assignments to the customer’s known configuration. Record the location of any missing devices. You can also compare this list of found resources to a prior version of the device tree as the following example shows.

When the partition is restarted, the update device tree command is run and the device tree is stored in the /var/lib/lsvpd/ directory in a file with the file name device tree YYYY-MM-DDHH:MM:SS, where YYYY is the year, MM is the month, DD is the day, and HH, MM, and SS are the hour, minute and second, respectively of the date of creation.

Type the following command at the command line: cd /var/lib/lsvpd/, then type the following command: lscfg -vpd device-tree-2003-03-31-12:26:31. This command displays the device tree that was created on 03/31/2003 at 12:26:31.