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we check the alarm in the event log:
1. On the storage, there is event records show that the write cache is closed. After about 20s it’s recovered in device manager.
2. BBU3 reports power is not full at 2016-03-02 01:58:27 time point. And after 4’s charging completed and become full at 2016-03-02 01:58:31. At the same time the alarm recovered.
Remark: 98%~100% represents power full for old version of BBU and 96%~100% for new version.
3. At the same time BBU0 is in periodic discharge test. The event shows that:
4. The discharge is triggered by system to make sure the bbus can work normally. It discharges the BBU firstly and then charges.
Discharge: The BBU0 discharge start at 00:00:01, end at 01:29:54.
The test begins at 00:00:01 and ends at 01:29:54. Here the time point in driver log is about 10s earlier than in device manager because the device manager is in upper level of system. The time point in driver log is more exactly.
Charge: The BBU0 charges starts at 01:29:54, ends at 03:32:33. Here at the issue happen time 01:58:28, the BBU0’s in charging.
BBU0 is in periodic discharge test. At the same time the BBU3’s power is not full (97%, There is electric leakage for each BBU event there is no usage of them.). For 2+1 5800V3 more than 1 BBU is not full, the system closes cache.
As there is no influence for service, and the probability is extremely low (BBU vendor assess that the probability is 0.0001%). Recommend no action regard to this alarm.