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https://www.dell.com/support/kbdoc/en-us/000141687/dell-perc-controller-learn-cycle-mode
The controller automatically performs the Transparent Learn Cycle (TLC) on the battery to calibrate and gauge its charge capacity once every 90 days. The operation can be performed manually, if required. All PERC 8 (H310 - H710) and above have this feature. The list of RAID Controllers is available on this link.
https://www.dell.com/community/PowerEdge-HDD-SCSI-RAID/DEGRADED-Battery-status-H700-Raid-adapter/td-p/3869291
2181 Thu Apr 26 05:41:59 2012 Storage Service The controller battery Learn cycle will start in 5 hours.: Battery 0 Controller 0 2181 Thu Apr 26 04:07:55 2012 Storage Service The controller battery Learn cycle will start in 5 hours.: Battery 0 Controller 1 2181 Wed Apr 25 10:42:19 2012 Storage Service The controller battery Learn cycle will ...
https://www.ibm.com/docs/SS9H2Y_7.5.0/com.ibm.dp.doc/harddisk_startingbatterylearningcycle_task.html
The RAID controller has a battery backup unit (BBU). TheBBU powers the write cache up for to 48 hours. Every 30 days, theappliance runs a learning cycle. You can manually start the learningcycle. When you or the appliance initiates this action, it takesapproximately six hours to complete.
https://support.icewarp.com/hc/en-us/articles/115003331768-How-does-the-RAID-Controller-battery-recalibration-process-work-
Controller will change to write-through cache policy until the battery learn cycle completes. 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.
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://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://community.mcafee.com/t5/Ironmail/Critical-Alert-Battery-relearn/td-p/331286
For example, some controller batteries are required to maintain the controller cache for 72 hours. While the Learn cycle is in progress, the battery may not be able to maintain the cache during a power loss. If the controller is using write-back cache policy, then the controller changes to write-through cache policy until the Learn cycle completes.
https://www.percona.com/blog/2010/11/16/on-the-perils-of-uniform-hardware-and-raid-auto-learn-cycles/
Sep 12 01:22:15 kernel: mfi0: (info) – Battery relearn will start in 1 day Sep 12 20:21:56 kernel: mfi0: (info) – Battery relearn will start in 5 hours Sep 13 01:23:06 kernel: mfi0: (info) – Battery relearn pending: Battery is under charge Sep 13 01:51:16 kernel: mfi0: (info) – Battery relearn started
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/11532/whats-a-battery-relearn-on-a-lsi-megaraid
Show activity on this post. Usually battery relearning refers to draining a battery in order to determine how long it holds a useful charge. In the case of a battery-backed write cache, this may be just to determine whether the battery is still good enough to trust your data to. Any useful write-caching solution must do this.
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