User's Manual

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.
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.
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