Common Fibre Loop/Bus Problems - NexStor 4900F Series User Manual

Common Fibre Loop/Bus Problems

Fibre loop or bus problems can usually be attributed to cabling issues, transceivers,
speed mode setting or possibly a faulty Disk I/O or Host I/O card. Refer to the
chart below to review troubleshooting and fault isolation procedures to assist you
in identifying the suspect component or problem, and the possible solutions.
Symptom
Host I/O Card "H0" or
"H1" Link LED not
illuminated.
Reason
Bus speed mode setting not
in agreement.
Faulty Transceiver.
Faulty Fibre Channel data
cable.
Faulty host Fibre Channel
HBA.
Host HBA failed to boot.
Chapter 5 - Troubleshooting
Solution
1) Verify that:
• Both Host I/O Cards' switch 1
settings are in 2 Gb or 1 Gb
mode. They must match.
• Host HBA is set to the same
speed mode as the Host I/O
Cards. It is not recommended to
use the auto setting on the
HBA. Manually set the speed
mode.
1) Verify that the transceiver is
functional in the Host I/O card and
the Host HBA (valid Link LED). You
may wish to swap the transceiver
for a "known good" transceiver.
2) Ensure that both the transmit and
receive functions are operational on
both the Host I/O Card and Host
HBA transceivers. The Tx/Rx
signals operate independently. For
example, the transmit on one end is
functioning but the receive function
could be faulty.
Replace the Fibre Channel data cable
with a "known good" cable.
Refer to your Fibre Channel host bus
adapter user's guide for information
on troubleshooting the adapter.
Ensure that the Host Fibre Channel
HBA booted and the driver was
properly loaded during the host
system boot process. Refer to your
Fibre Channel HBA user's guide for
more information.
Common Fibre Loop/Bus Problems
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