User's Manual

RAID Controller Batteries 173
Battery Tasks
To execute a drop-down menu battery task:
1
Expand the Storage tree object to display the controller objects.
2 Expand a controller object.
3 Select the Battery object.
4 Select a task from the Available Tasks drop-down menu.
5 Click Execute .
Drop-Down Menu Battery Tasks:
• Start Learn Cycle
• Battery Delay Learn Cycle
Related information:
• Battery Properties
Start Learn Cycle
Does my controller support this feature? See Supported Features .
Use 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 of time 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 that data can be lost in the cache if
there is a power loss.
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 loss while the
Learn cycle is in progress.