Users guide

333 Intel® RAID Software User Guide
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
on-board 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.
C
Cache Fast memory that holds recently accessed data. Use of cache
memory speeds subsequent access to the same data. When data is
read from or written to main memory, a copy is also saved in cache
memory with the associated main memory address. The cache
memory software monitors the addresses of subsequent reads to
see whether the required data is already stored in cache memory. If
it is already in cache memory (a cache hit), it is read from cache
memory immediately and the main memory read is aborted (or not
started). If the data is not cached (a cache miss), it is fetched from
main memory and saved in cache memory.
Cache flush interval A controller property that indicates how often the data cache is
flushed.
Caching The process of using a high-speed memory buffer to speed up a
computer system’s overall read/write performance. The cache can
be accessed at a higher speed than a drive subsystem. To improve
read performance, the cache usually contains the most recently
accessed data, as well as data from adjacent drive sectors. To
improve write performance, the cache can temporarily store data in
accordance with its write back policies.
Capacity A property that indicates the amount of storage space on a drive or
virtual drive.
Coerced capacity A drive property indicating the capacity to which a drive has been
coerced (forced) to make it compatible with other drives that are
nominally the same capacity. For example, a 4-GB drive from one
manufacturer might be 4,196 MB, and a 4-GB from another
manufacturer might be 4,128 MB. These drives could be coerced to
a usable capacity of 4,088 MB each for use in a drive group in a
storage configuration.
Coercion mode A controller property indicating the capacity to which drives of
nominally identical capacity are coerced (forced) to make them
usable in a storage configuration.