Fibre Channel Problem Determination - IBM 3592 Maintenance Information

• If the Wrap Test passes, the drive is good.
6. If you still have a Fibre Channel failure, the problem might be in the cable or at the host. Go to the
service manual for the host, or contact your next level of support.
7. Remove any wrap tool, and restore the Fibre Channel connection.
8. Ensure that the drive is returned to the operator mode.
• Press Change Mode , then select Operator Mode.
--OR--
• Press Reset.
9. At the completion of the activity, ensure that you have the customer do a reconfiguration on all
systems to update the configuration, if necessary.
10. Return to the procedure that sent you here.

Fibre Channel problem determination

Use this information to help you isolate the source of a Fibre Channel problem.
Common Fibre messages
See "Supplemental Messages" in Table 44 on page 79 for Fibre Channel messages that display on the
service panel.
Fibre Bus problem determination
Use the "Solid Fibre Channel errors" on page 237 procedure or the "Intermittent Fibre Channel errors" on
page 239 procedure.
Attention: Notify the customer that the devices on the Fibre Channel must be varied offline before
the problem determination procedure can be completed.
Verify the Fibre Channel topology. Verify that a problem exists between the drive, the drive cable, and the
device to which it is attached. Use the switch, hub, or other fibre product service guides, as appropriate.
Verify that the switch hub configuration, host adapter, host software levels, and device drivers are
supported.
Refer to the Practical Guide for SAN with System p in "Website information" on page xviii for the latest
information.
Notes:
• Refer to "Fibre Channel attachments" on page 177 to ensure that all of the Fibre Channel cables are
installed correctly.
• Ensure that the port/node names (WWID) are unique. If two drives in an installation have the same
WWID, only one is recognized by the host or the controller.
Solid Fibre Channel errors
Determine the number of drives on the Fibre Channel.
Single tape drive on Fibre Channel loop
1. Ensure that the drive serial number is the same as the drive serial number that is used by the host
program.
2. Ensure that the Fibre Channel options are set correctly. See "Fibre Options menu (Services menu)" on
page 100.
3. Ensure that the drive is seeing light and is communicating. The Port 0 or Port 1 LED on the back of the
drive is flashing green, and the status area does not have -- -- -- or ?? ?? ??. Ensure that the
AL_PA is valid (status area does not display CONFLICT or OFFLINE).
Procedures 237