Lenovo ThinkServer RD650, Руководство пользователя

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LSI Corporation
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12Gb/s MegaRAID SAS Software User Guide

March 2014
Glossary
Gas gauge status Hexadecimal value that represents the status flag bits in the gas gauge status register.
H
Hole 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.
Host interface A controller property indicating the type of interface used by the computer host system:
for example,
PCIX .
Host port count A controller property indicating the number of host data ports currently in use.
Host system Any computer system on which the controller is installed. Mainframes, workstations, and
standalone desktop systems can all be considered host systems.
Hot spare 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
Initialization 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.
IO policy 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
Learning cycle 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
Learn delay interval Length of time between automatic learn cycles. You can delay the start of the learn cycles
for up to 168 hours (seven days).
Learn mode Mode for the battery auto learn cycle. Possible values are Auto, Disabled, and Warning.
Learn state Indicates that a learn cycle is in progress.
Load-balancing 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.
Low-power storage
mode Storage mode that causes the battery pack to use less power, which save battery power
consumption.
LKM Local Key Management
M
Manufacturing date Date on which the battery pack assembly was manufactured.
Manufacturing name Device code that indicates the manufacturer of the components used to make the
battery assembly.