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Alarm Message "PEM Is Faulty" Appears Due to the Expiration of BBUs

Publication Date:  2012-07-22 Views:  515 Downloads:  0

Issue Description

The alarm message PEM Is Faulty appears under Faults List in the ISM.

Product and version information:
  • S2600

Alarm Information

In the ISM, choose Fault > Fault Management, and the alarm message "PEM Is Faulty" can be found under Faults List.

Handling Process

1. Replace the BBU.


For the steps on replacing BBUs, see the section "Replacing BBU Modules" in the supplied troubleshooting guide.

Root Cause


  1. By checking the system log, no errors can be found for the procedure for power supply detection.
    Jul  1 12:07:32[86712890][DEV][FIX][0]:Battery 0 capability recovery to be enough to write coffer
    Jul 31 12:11:20[2679334253][DEV][INFO][0]:Battery 0 discharge success
    Jul 31 12:11:20[2679334253][DEV][INFO][0]:Battery 0  simple dischage executed
    Jul 31 12:12:20[2679394593][DEV][INFO][0]:Battery 0 charge state change from NOT AVG to AVG
    Jul 31 12:34:00[2680695179][DEV][INFO][0]:Battery 0 charge state change from AVG to NOT AVG
    Jul 31 13:04:01[2682496553][DEV][INFO][0]:Battery 0 discharge success. @DEV_ScsiDischarge:1164
  2. It is found that the discharge time of a BBU is too short.
    Jul 31 13:04:01[2682496553][DEV][INFO][0]:Battery 0 deep dischage executed. @DEV_BatteryDeepDischargeControl:2590
    Jul 31 13:04:02[2682497537][DEV][INFO][0]:Battery 0 does not discharge
    Jul 31 13:09:17[2682811727][DEV][WARN][0]:Battery 0 status FAULT not good, alarm it


  • The system reports PEM Is Faulty as the BBU is near its expiration.