Cisco UCS IOM POST failure, Error Code: F0481

We have got the following error messages on Cisco UCS IO ( FEX ) module.

both in left and right IOM Module's we have got the same error.

left IOM 1/1 (A) POST failure
Code: F0481
right IOM 1/2 (B) POST failure
Code: F0481

Fix  is very simple try reseating or resetting the IO module that is giving the problem.

Before you attempt to do that make sure that you the other IOmodule in the Chassis is working fine and all the blades in the chassis have other path available when the IOmodule is reseated. If you have only one IOmodule then you would need to power down the blades first.

Here I’ll show how to reset IOmodule from UCSM.

Step 1 : Select the IOmodule that is giving problems and click Reset IO Module

It will prompt for confirmation

Now you will see that IOmodule is not reachable and one path for Chassis is down.

Critical errors and Warnings will be logged ( don't worry it will establish the connectivity back )

Hopefully this post will help you in resolving this issue, Call Cisco if this is not resolved even after doing above steps.

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