Low lights on ports

Question

We have windows host connected to two SAN Brocade switches.We were seeing low light on both the ports of switches slot2/port28.We have done the following

1)HBAS from host were replaced
2)new cables were laid from Host to both the switches.low light remains.
3)Swapped the cabels to free ports on both switches and checked RX and TX power by sfpshow command.Still seeing low light

Only thing remaining is sfp module swap which may not be necessary as we cant have sfp modules failing on both switches.

Is there anything else whcih I might have missed.If at all this is Host issuse what can be done?Is there anything on switch which may result in this?

Thanks

RRR · Answer

I only know 'no light', 'No sync', 'in sync' and 'online'. I've never seen the 'low light'

sidd2 · Answer

I mean RX and TX power on the port are as follows.RX Power: 1.2 uWattsTX Power: 0.0 uWattsThis should be atleast 200 watts.

RRR · Answer

OMG, I never dig this deep into the SFPs specs and stats. I guess you should try to exchange some SFP's and patch cables to find out where the problem lies.

sidd2 · Answer

its already done

RRR · Answer

I don't know anymore... I'd create a Service Request if I were you.

JasonBailey · Answer

You have tried all of the first steps, it doesn't leave much more to check.

In this situation, you can try using a known good hba + cable in the suspect switch port to verify the SFP is fine. Then you can try a known good hba with the suspect cable to verify the cable is fine.

I have seen a situation where the switch cabinet door when closed is bending cables at an angle which is a concern. Also I have seen issues with bad fibre patch panels where running a cable over the floor tiles highlighted the issue.

RRR · Answer

Any luck yet ?

Connectrix

Low lights on ports

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