Analyze Dell Server RAID card BBU discharge status from monitoring data

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From 2015-12-27 18:02 early warning distance to enter the leam_cycle time <48 hours, in 2015-12-29 10:06 began to prompt has begun to enter the leam_cycle actually I this monitoring is the first stage of the state, meaning has entered the Leam _cycle first stage.

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From the time of entering the first stage to the "distance from the next entry into leam_cycle time <48 hours" This alarm has to recover time, 2015-12-29 10:06-2015-12-29 13:11 The whole process is three hours to complete, That is, from the first stage to the complete process is three hours.

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From the above monitoring diagram can see the BBU at 9 points when the battery capacity is rising, up to the maximum, just 10:06 minutes, that is, leam_cycle into the first stage of time, from this buu discharge rule, the entire process to enter the BBU discharge is 4 hours to complete To get the second message, the BBU discharge rule is the rise maximum and then discharge, put to the minimum of the tolerable range and then rise to the maximum, while the maximum value is reduced, visible lithium battery discharge life is reduced. This can be seen in the change in the Bbu battery life. (Of course, this data is not the most accurate, because I collect data density is 1 hours 1 times, but the whole process can be seen, the acquisition granularity has been adjusted 1 minutes once, continue to observe may find more interesting things ~)

But from the "early warning distance to enter leam_cycle time <48 hours" this warning that he should be 48 hours to complete the recovery, the time should be 2015-12-29 18:02, from the start time to the time it is expected to end the process should take 8 hours (10:0 6-18:02), but he was in 2015-12-29 13:11 This problem resumed, from the second figure above from 13:11 this point in time to restart the calculation, he finished 5 hours earlier, plus from 9 o'clock began to charge, counted up 4 hours ahead of completion. Why is there such a situation? Here's my guess:

1, before entering the first stage, he will enter the charging state until the maximum value. But the current capacity of the remaining battery capacity is not every time the same, this is from 500mAh to 550mAh with about one hours, the next time when the battery may be less than the remaining capacity, so I introduced I guess, he had to expect 8 hours is based on his design to offend the small maximum, from the minimum to the maximum need to how long, How long it takes to get from the maximum to the minimum, and then the time, is that 8 hours is the most conservative time he has ever designed.

This concludes: If you want to avoid the server peak manually into the BBU discharge children's shoes, to take this 8 hours into account, and then plan to manually enter the BBU discharge time to real time.

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Analyze Dell Server RAID card BBU discharge status from monitoring data