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https://www.thegeekstuff.com/2015/01/dell-w1228-raid-battery-error/#:~:text=Start%20the%20server.%20After%20you%20replace%20the%20battery%2C,message%20from%20the%20front%20panel%20should%20go%20away.
https://www.dell.com/support/kbdoc/en-us/000141687/dell-perc-controller-learn-cycle-mode
When the learn cycle detects the battery can no longer store enough charge for 24 hours you will receive a "Predicted failure" message in the system logs, telling you the battery is near the end of it's useful life and needs to be replaced.
https://www.dell.com/community/Systems-Management-General/Battery-Learn-Cycle-Alerts/td-p/3006559
The controller battery Learn cycle will start in 24 hours., Controller 1, Battery 0 What alert needs to be excluded for to eliminate these information alerts? 0 Kudos
https://support.icewarp.com/hc/en-us/articles/115003331768-How-does-the-RAID-Controller-battery-recalibration-process-work-
Expected time frame for completion of a learn cycle is about 7 hours and it’ll shorten as the battery capacity deteriorates over time. Discharge cycle - 3 hours; Charge cycle - 4 hours; Controller will change to write-through cache policy until the battery learn cycle completes. 7-Series Platforms: Models that use a RAID Controller and the RAID Controller Type:
https://mysupport.netapp.com/NOW/public/eseries/sam/GUID-8538272A-B802-49D9-9EA2-96C82DAD26A2/GUID-669CF591-CB3E-4E60-92F2-2121F9D7E1DD.html
Learn cycles for duplex controller systems occur simultaneously. For controllers having backup power from more than one battery or set of battery cells, learn cycles occur sequentially. Learn cycles are scheduled to start automatically at regular intervals, at the same time and on the same day of the week.
https://www.thegeekstuff.com/2015/01/dell-w1228-raid-battery-error/
After you replace the battery, you might still see the error message for a little while. i.e Until the controller goes through couple of learning cycle. This might take around 24 hours. Typically, within 24 hours of changing the new RAID battery, the W1228 message from the front panel should go away.
https://library.netapp.com/ecmdocs/ECMLP2502818/html/GUID-05AF1DE8-192A-4536-92E1-1BB1F54B073F.html
A learn cycle is an automatic cycle for calibrating the smart battery gauge. The learn cycle enables the storage management software to predict the remaining battery life. Learn cycles run at set intervals and store the results for software analysis. The set storageArray learnCycleDate command sets the learn cycle for the battery backup unit in a single controller in the array, or …
https://exastuff.blogspot.com/2016/02/what-is-bbu-and-learn-cycle-in-exadata.html
Any virtual drives attached will be forced into WT cache mode while a full learn cycle is performed. Usually a sufficient charge to maintain the cache is reached after this cycle is complete. This may take 24 hours or longer. To determine the Battery Type, run the following: # ./MegaCli64 -AdpBbuCmd -a0 | grep BatteryType BatteryType: iBBU08
https://www.percona.com/blog/2012/01/05/looking-for-raid-controller-without-battery-learning-problems/
NOTE: Virtual disks stays in Write Back mode, if enabled, during transparent learn cycle. When the TLC completes, the controller sets the next TLC to +90 days. TLC Time Frame The time frame for completion of a learn cycle is a function of the battery charge capacity and the discharge and charge currents used. For PERC H710 or H810 cards, the expected time frame …
https://serverfault.com/questions/530125/managing-battery-relearn-cycles-on-lsi-and-similar-raid-controllers
Just recently I read an article by one of Godaddy's engineers about this very topic: Learning to Deal with Learning. On their hardware (Dell PERC cards) battery learning cycle happens every 90 days, but no way to know when exactly it'll happen, ie during peak or off-peak hours. They talked about different solutions: Outright disable Battery ...
https://community.spiceworks.com/topic/853093-raid-battery
The error you are receiving is reported when the relative charge is less than 24 hours. It is a warning that there is less than 24 hours of charge left on the battery. This error can be caused by the normal maintenance operation of a learn cycle. Thanks
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