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Problem
Fibre Channel adapter B
appears to be unattached or
disconnected.
The N3700 storage system
won't stop beeping.
Possible cause
You have an open loop. Fibre
Channel needs a
closed/completed loop to
communicate.
It is the kernel's responsibility
to "ping" the ops panel
occasionally so the ops
panel's watchdog timer
doesn't start beeping.
Solution
v Check the terminate switch on the CPU module. If
an expansion shelf is attached to your system, the
terminate switch should be OFF. If there's no
expansion shelf, you must have the terminate
switch set to ON.
v If you have expansion shelves, the last shelf must
have its terminate switch set to ON. All other
shelves in the loop (including the CPU module)
must have the terminate switches set to OFF.
v If that doesn't fix it, you might have a faulty shelf,
drive, or cable. Try removing items until the loop
closes and then add them back until you see the
failure. While removing/adding, be sure to set the
terminate switches appropriately.
v If that still doesn't fix it, you might have a bad
adapter on the CPU module (rare case). Call your
IBM service representative to replace the CPU
module.
Push the MUTE button on the back of the shelf to stop
the beeping. If beeping continues, contact IBM
technical support.
Chapter 6. Error messages and troubleshooting
53
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Table of Contents
Troubleshooting
