Software Support

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.
Related Links
Initiating The Battery Delay Learn Cycle
Battery Transparent Learn Cycle
The PERC H710 and PERC H810 controllers support Transparent Learn Cycle (TLC), a periodic operation that calculates
the charge that is remaining in the battery to ensure that there is sufficient energy. The operation runs automatically,
and causes no impact to the system or controller performance. The controller automatically performs TLC on the battery
to calibrate and gauge its charge capacity once every 90 days. The operation can be performed manually, if required.
Initiating The Battery Delay Learn Cycle
Does my controller support this feature? See Supported Features.
The controller firmware automatically initiates the battery learn cycle every 90 days. Although you cannot stop the
firmware from running the learn cycle, you can delay the start time of the learn cycle for up to seven days.
Related Links
Starting A Learn Cycle
RAID Controller Batteries
Delay The Battery Learn Cycle
1. Type a numerical value in the Days text box. The value must be within the 0–7 range. The value indicates the
number of days for which you want to delay the battery learn cycle. The learn cycle can be delayed for a maximum
of seven days.
2. Type a numerical value in the Hours text box. The value must be within the 0–23 range. The value indicates the
number of hours for which you want to delay the battery learn cycle.
3. Click Apply Changes.
To exit and cancel your changes, click Go Back To Battery Information Page.
To Locate Delay Learn Cycle In Storage Management
To locate this task in Storage Management:
1. In the Server Administrator window, under the system tree, expand the Storage to display the controller objects.
2. Expand the controller object.
3. Select the Battery object.
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