Low Optical Transmitting Power of the Port Reported by the N8300 Back-end Storage

Publication Date:  2012-07-18 Views:  161 Downloads:  0
Issue Description
In an office, during the power-on of a two-node N8300 with the S5500 as the storage unit, the buzzer alarms on the S5500. The management software displays that port 02 of controller A has low optical transmitting power. The working parameter of the optical module exceeds the normal range.
Alarm Information
None
Handling Process
Step 1  Replace the optical fiber and check the alarm. The fault persists.
Step 2  Replace the optical module of the port on the storage controller. The fault persists.
Step 3  Exchange the optical fibers that connect the NAS engine to ports 00 and 02 of controller A. It is found that port 2 that generates the alarm restores to normal but port 00 generates the alarm of abnormal optical signal receiving.
Step 4  Determine that the HBA port of the NAS engine is faulty.
Step 5  Replace the HBA of the engine. The fault is rectified.
Root Cause
Optical fibers are often used to connect the back-end storage units of the NAS device. The reason for abnormal optical module working is that the SFP module is faulty, optical fiber quality is poor, or the HBA port of the NAS engine is faulty.
Suggestions
Optical fibers are often used to connect the back-end storage units of the NAS device. Therefore, when the device reports an alarm of abnormal optical signal receiving, check whether the optical module, optical fibers, and HBA are faulty.

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