nStor NexStor 4700F Series, User Manual

Page: 70 / 106

Chapter 5 - Troubleshooting
Common Fibre Loop/Bus Problems
58
Common Fibre Loop/Bus Problems
Fibre loop or bus problems can usually be attributed to cabling issues, transceivers,
or possibly a faulty I/O connector. 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 Reason Solution
“H0L” or “H1L” Link
LED not illuminated. Bus speed mode setting not
in agreement. 1) Using either StorView or VT-100
interface examine the port data rate
settings. If they are manually set
ensure that they match the HBA port
speed. There are three possible
settings: automatic, 1Gb, and 2Gb.
Faulty Transceiver. 1) Verify that the transceiver is
functional (valid Link H0L or H1L
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 controller 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.
Faulty Fibre Channel data
cable. Replace the Fibre Channel data cable
with a “known good” cable.
Faulty host Fibre Channel
HBA. Refer to your Fibre Channel host bus
adapter user’s guide for information
on troubleshooting the adapter.
Host HBA failed to boot. 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.
4700F.book Page 58 Wednesday, April 6, 2005 11:05 AM