Symptom-To-Fru Index; Symptom-To-Fru Index For Type 3523 Fibre Channel Hub And Gbic - IBM TotalStorage DS4000 Hardware Maintenance Manual

Symptom-to-FRU index

The Symptom-to-FRU index (see Table 9) lists symptoms, errors, and the possible
causes. The most likely cause is listed first.
The PD maps found in the IBM TotalStorage DS4000 Problem Determination Guide
provide you with additional diagnostic aids.
Note:
Table 9. Symptom-to-FRU index for Type 3523 fibre channel hub and GBIC
Problem
GBIC installed in one or
more ports but no LED is
lit.
GBIC installed but only the
amber LED is lit.
GBIC installed and both
green and amber LEDs are
lit.
GBIC is installed, only the
green LED is lit, but no
communication occurs
between the devices.
8
IBM TotalStorage DS4000: Hardware Maintenance Manual
1. Always start with the "General checkout" on page 4. For IBM devices
not supported by this index, see the manual for that device.
2. Do not look directly into any fiber cable or GBIC optical output. Read
"Notices" on page 137. To view an optical signal, use a mirror to view
the reflected light.
Action/FRU
1. Power cord
2. Power source
1. Reseat GBIC
2. GBIC
The hub is not receiving a valid fibre channel signal from the end node. Perform
the following steps:
1. Unplug the fiber cable from the node and, using a mirror, verify that an optical
signal is present on the cable. If no red light is visible, replace the cable.
2. Using a mirror, examine the SC connectors on the HBA or disk controller. If no
red light is visible, check the HBA or disk controller.
3. If a light is present on both the cable lead and the end node, check the HBA or the
disk controller.
The hub is receiving a valid fibre channel signal from the end device, but no
upper-level protocols are active. Perform the following steps:
1. Verify that the proper HBA device drivers are loaded for the appropriate
operating system and that the host has been configured to recognize the attached
disk devices.
2. Unplug the fiber cable from the end node and verify that an optical signal is
present on the cable lead. If no signal is present, the lead of the cable might be
defective. Replace the cable.