Recovering cache data
If a system power loss or improper system shutdown has occurred:
1
Restore the system power.
2
Boot the system.
3
Where preserved cache exists on the controller, an error message is shown. For more information on how to recover cache, see
Battery Transparent Learn Cycle
A transparent learn cycle is a periodic operation that calculates the charge that is remaining in the battery to ensure there is sufficient
energy. The operation runs automatically, and causes no impact to the system or controller performance.
The controller automatically performs the Transparent Learn Cycle (TLC) on the battery to calibrate and gauge its charge capacity once
every 90 days. The operation can be performed manually, if required.
NOTE:
Virtual disks stay in Write Back mode, if enabled, during transparent learn cycle. When the TLC completes, the controller
sets the next TLC to +90 days.
Transparent Learn Cycle Completion Time
The time frame for completion of a learn cycle is a function of the battery charge capacity and the discharge and charge currents used.
Typical time completion for a transparent learn cycle is between 4-8 hours. If the learn cycle is interrupted mid cycle, it begins at a new
cycle.
Conditions for replacing the battery
The PERC battery is marked
Failed
when the state or health of the battery is declared bad. If battery is declared failed then the firmware
runs learn cycles in subsequent reboots until the battery is replaced. After replacing the battery, virtual disk transitions to
Write Back
mode.
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Features
