Users Guide

Table 35. Battery Properties (continued)
Property Definition
Next Learn Time Displays the number of days and hours left before the controller firmware initiates the next
learn cycle.
Maximum Learn Delay Displays the maximum number of days and hours that you can delay the battery learn cycle.
The controller firmware automatically initiates the battery learn cycle. You cannot stop or
pause the learn cycle, but you can delay it.
Battery Tasks
To access the battery tasks:
1. In the Server Administrator window, under the system tree, expand the Storage dashboard to display the controller
objects.
2. Expand a controller object.
3. Select Battery.
4. Select a task from the Available Tasks drop-down menu.
5. Click Execute.
Battery — Available Tasks
The available battery tasks are:
● Starting A Learn Cycle
● Battery Transparent Learn Cycle
● Initiating The Battery Delay Learn Cycle
Starting A Learn Cycle
Does my controller support this feature? See Supported Features.
Select the Start Learn Cycle task to initiate the battery learn cycle.
The battery learn cycle discharges and then fully charges the controller battery.
The learn cycle recalibrates the battery-integrated circuit so that the controller can determine whether the battery can maintain
the controller cache for the prescribed period in the event of a power loss.
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.
The write-through cache policy writes the data directly to the disk and reduces the risk of data loss in the cache during a power
outage.
NOTE:
If you have set the controller to Force Write-Back Cache policy, then the cache policy is not changed during the
learn cycle. When using Force Write-Back Cache policy, it is possible for data loss to occur if there is a power outage
while the learn cycle is in progress.
The controller firmware automatically initiates the learn cycle every 90 days. You can, however, delay the start time of the learn
cycle for a further seven days, after which the firmware automatically initiates the learn cycle.
NOTE:
The learn cycle cannot be performed while the battery is charging. If either a user or the controller firmware initiates
the learn cycle while the battery is charging, then the battery learn state displays Requested. The learn cycle begins when
the battery is fully charged.
RAID Controller Batteries 111