Glossary - Lenovo ThinkServer RD650 User Manual

12Gb/s MegaRAID SAS Software User Guide
March 2014

Glossary

This appendix provides a glossary for terms used in this document.
Absolute state of
charge
Access policy
Alarm enabled
Alarm present
Array
Auto learn mode
Auto learn period
Average time to
empty
Average time to full
Battery module
version
Battery replacement
Battery retention time
Battery status
Battery type
BBU present
BGI rate
BIOS
A
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.
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.
A controller property that indicates whether the controller's onboard alarm is enabled.
A controller property that indicates whether the controller has an onboard alarm. If
present and enabled, the alarm is sounded for certain error conditions.
See drive group.
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.
Time between learn cycles. A learn cycle is a battery calibration operation performed
periodically by the controller to determine the condition of the battery.
One-minute rolling average of the predicted remaining battery life.
Predicted time to charge the battery to a fully charged state based on the one minute
rolling average of the charge current.
B
Current revision of the battery pack module.
Warning issued by firmware that the battery can no longer support the required data
retention time.
Time, in hours, that the battery can maintain the contents of the cache memory.
Operating status of the battery. Possible values are Missing, Optimal, Failed, Degraded
(need attention), and Unknown.
Possible values are intelligent Battery Backup Unit (BBU), intelligent Battery Backup Unit
(iBBU), intelligent Transportable Battery Backup Unit (iTBBU), and ZCR Legacy.
A controller property that indicates whether the controller has an onboard battery
backup unit to provide power in case of a power failure.
A controller property indicating the rate at which the background initialization of virtual
drives will be carried out.
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.
LSI Corporation
- 406 -
Glossary