Dell PowerEdge RAID Controller 6E - Manual (Page 31)

About PERC 6 and CERC 6/i Controllers
31
Battery Learn Cycle
Learn cycle is a battery calibration operation performed by the controller
periodically to determine the condition of the battery. This operation cannot
be disabled.
You can start battery learn cycles manually or automatically. In addition,
you can enable or disable automatic learn cycles in the software utility. If you
enable automatic learn cycles, you can delay the start of the learn cycles for
up to 168 hours (7 days). If you disable automatic learn cycles, you can start
the learn cycles manually, and you can choose to receive a reminder to start
a manual learn cycle.
You can put the learn cycle in Warning Only mode. In the Warning Only
mode, a warning event is generated to prompt you to start the learn cycle
manually when it is time to perform the learn cycle operation. You can select
the schedule for initiating the learn cycle. When in Warning Only mode,
the controller continues to prompt you to start the learn cycle every seven
days until it is performed.
NOTE:
Virtual disks automatically switch to Write-Through mode when the battery
charge is low because of a learn cycle.
Learn Cycle Completion Time Frame
The time frame for completion of a learn cycle is a function of the battery
charge capacity and the discharge/charge currents used. For PERC 6,
the expected time frame for completion ofa learn cycle is approximately
seven hours and consists of the following parts:
• Learn cycle discharge cycle: approximately three hours
• Learn cycle charge cycle: approximately four hours
Learn cycles shorten as the battery capacity deteriorates over time.
NOTE:
For additional information, see the OpenManage storage
management application.
During the discharge phase of a learn cycle, the PERC 6 battery charger
is disabled and remains disabled until the battery is discharged. After the
battery is discharged, the charger is re-enabled.
Dell_PERC6.2_UG.book Page 31 Wednesday, June 24, 2009 6:08 PM