R/Evolution 2000 Series Troubleshooting Manual page 26

4. Move the SFP and cable to a port with a known good link status.
This step isolates the problem to the external data path (SFP, host cable, and host-
side devices) or to the controller module port.
Is the host link status LED on?
Yes – You now know that the SFP, host cable, and host-side devices are
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functioning properly. Return the SFP and cable to the original port. If the link
status LED remains off, you have isolated the fault to the controller module's
port. Replace the controller module.
No – Proceed to the next step.
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5. Swap the SFP with the known good one.
Is the host link status LED on?
Yes – You have isolated the fault to the SFP. Replace the SFP.
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No – Proceed to the next step.
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6. Re-insert the original SFP and swap the cable with a known good one.
Is the host link status LED on?
Yes – You have isolated the fault to the cable. Replace the cable.
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No – Proceed to the next step.
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7. Replace the HBA with a known good HBA, or move the host side cable and SFP to
a known good HBA.
Is the host link status LED on?
Yes – You have isolated the fault to the HBA. Replace the HBA.
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No – It is likely that the controller module needs to be replaced.
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8. Move the cable and SFP back to its original port.
Is the host link status LED on?
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26 R/Evolution 2000 Series Troubleshooting Guide • May 2008
No – The controller module's port has failed. Replace the controller module.
Yes – Monitor the connection for a period of time. It may be an intermittent
problem, which can occur with SFPs, damaged cables, and HBAs.