Lenovo ThinkServer RD650 User Manual page 410

12Gb/s MegaRAID SAS Software User Guide
March 2014
Gas gauge status
Hole
Host interface
Host port count
Host system
Hot spare
Initialization
IO policy
Learning cycle
Learn delay interval
Learn mode
Learn state
Load-balancing
Low-power storage
mode
LKM
Manufacturing date
Manufacturing name
Hexadecimal value that represents the status flag bits in the gas gauge status register.
H
In MegaRAID Storage Manager, a hole is a block of empty space in a drive group that can
be used to define a virtual drive.
A controller property indicating the type of interface used by the computer host system:
for example, PCIX.
A controller property indicating the number of host data ports currently in use.
Any computer system on which the controller is installed. Mainframes, workstations, and
standalone desktop systems can all be considered host systems.
A standby drive that can automatically replace a failed drive in a virtual drive and prevent
data from being lost. A hot spare can be dedicated to a single redundant drive group or it
can be part of the global hot spare pool for all drive groups controlled by the controller.
When a drive fails, MegaRAID Storage Manager software automatically uses a hot spare
to replace it and then rebuilds the data from the failed drive to the hot spare. Hot spares
can be used in RAID 1, 5, 6, 10, 50, and 60 storage configurations.
I
The process of writing zeros to the data fields of a virtual drive and, in fault-tolerant RAID
levels, generating the corresponding parity to put the virtual drive in a Ready state.
Initialization erases all previous data on the drives. Drive groups will work without
initializing, but they can fail a consistency check because the parity fields have not been
generated.
A virtual drive property indicating whether Cached I/O or Direct I/O is being used. In
Cached I/O mode, all reads are buffered in cache memory. In Direct I/O mode, reads are
not buffered in cache memory. Data is transferred to cache and the host concurrently. If
the same data block is read again, it comes from cache memory. (The IO Policy applies to
reads on a specific virtual drive. It does not affect the read ahead cache.)
L
A battery calibration operation performed by a RAID controller periodically to determine
the condition of the battery. You can start battery learn cycles manually or automatically
Length of time between automatic learn cycles. You can delay the start of the learn cycles
for up to 168 hours (seven days).
Mode for the battery auto learn cycle. Possible values are Auto, Disabled, and Warning.
Indicates that a learn cycle is in progress.
A method of spreading work between two or more computers, network links, CPUs,
drives, or other resources. Load balancing is used to maximize resource use, throughput,
or response time.
Storage mode that causes the battery pack to use less power, which save battery power
consumption.
Local Key Management
M
Date on which the battery pack assembly was manufactured.
Device code that indicates the manufacturer of the components used to make the
battery assembly.
LSI Corporation
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Glossary