LSI Corporation
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12Gb/s MegaRAID SAS Software User Guide
March 2014
Glossary
Glossary
This appendix provides a glossary for terms used in this document.
A
Absolute state of
charge
Predicted remaining battery capacity expressed as a percentage of Design Capacity. Note
that the Absolute State of Charge operation can return values greater than 100 percent.
Access policy A virtual drive property indicating what kind of access is allowed for a particular virtual
drive. The possible values are Read/Write, Read Only, or Blocked.
Alarm enabled A controller property that indicates whether the controller’s onboard alarm is enabled.
Alarm present A controller property that indicates whether the controller has an onboard alarm. If
present and enabled, the alarm is sounded for certain error conditions.
Array See drive group.
Auto learn mode The controller performs the learn cycle automatically in this mode. This mode offers the
following options:
BBU Auto Learn: Firmware tracks the time since the last learn cycle and performs a learn cycle
when due.
BBU Auto Learn Disabled: Firmware does not monitor or initiate a learn cycle. You can
schedule learn cycles manually.
BBU Auto Learn Warn: Firmware warns about a pending learn cycle. You can initiate a learn
cycle manually. After the learn cycle is complete, the firmware resets the counter and warns
you when the next learn cycle time is reached.
Auto learn period Time between learn cycles. A learn cycle is a battery calibration operation performed
periodically by the controller to determine the condition of the battery.
Average time to
empty
One-minute rolling average of the predicted remaining battery life.
Average time to full Predicted time to charge the battery to a fully charged state based on the one minute
rolling average of the charge current.
B
Battery module
version
Current revision of the battery pack module.
Battery replacement Warning issued by firmware that the battery can no longer support the required data
retention time.
Battery retention time Time, in hours, that the battery can maintain the contents of the cache memory.
Battery status Operating status of the battery. Possible values are Missing, Optimal, Failed, Degraded
(need attention), and Unknown.
Battery type Possible values are intelligent Battery Backup Unit (BBU), intelligent Battery Backup Unit
(iBBU), intelligent Transportable Battery Backup Unit (iTBBU), and ZCR Legacy.
BBU present A controller property that indicates whether the controller has an onboard battery
backup unit to provide power in case of a power failure.
BGI rate A controller property indicating the rate at which the background initialization of virtual
drives will be carried out.
BIOS Basic Input/Output System. The computer BIOS is stored on a flash memory chip. The
BIOS controls communications between the microprocessor and peripheral devices, such
as the keyboard and the video controller, and miscellaneous functions, such as system
messages.
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