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Server Administrator Storage Management 8.2 User’s Guide

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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.

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