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support.dell.com Troubleshooting 8-9
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The I/O modules are the connection points for Fibre Channel loops. They contain a
hub function so that when a daisy chain connection is not made, the Fibre Channel
loop is automatically closed within the unit. When facing the rear of the system, I/O
module 0 is on the right side and I/O module 1 is on the left side. I/O module 0 con-
nects to Fibre Channel Loop A. I/O module 1 connects to Fibre Channel Loop B.
To troubleshoot the I/O module, perform the following steps:
1. Is the green RX indicator off?
Yes
. Perform the following steps:
a. Confirm that power supply lights are on.
b. Confirm that the I/O module is not inserted upside down into the unit.
c. Confirm that the cable is plugged into the port next to the RX indicator.
d. Confirm that the other end of the cable is connected to an active and pow-
ered Fibre Channel port.
No.
Proceed to step 2.
2. Perform the following steps:
a. Try another cable for the connection to the I/O module. If this resolves the
problem, end troubleshooting.
b. Replace the I/O module in the unit where the RX indicator does not light. If
this resolves the problem, end troubleshooting.
c. Replace the I/O module, Dell Fibre Disk RAID Controller, or other device that
is connected to the I/O module. If this resolves the problem, end
troubleshooting.
3. Is the problem resolved?
Yes.
End troubleshooting.
No
. See Chapter 9, “Getting Help,” for instructions on obtaining technical
assistance.
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The LS module contains the loop resiliency circuit for the Fibre Channel loop. When
you face the front of the system, LS Module A is on the left side and LS Module B is
on the right side. LS Module A contains the loop resiliency circuit for Fibre Channel
Loop A. LS Module B contains the loop resiliency circuit for Fibre Channel Loop B. The
LS modules also contain the enclosure processor for all enclosure management. The
enclosure processors operate in active/passive mode: only one enclosure processor