LSI Corporation
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12Gb/s MegaRAID SAS Software User Guide
March 2014
Glossary
Virtual Drive State
A virtual drive can be in any one of the following states:
Optimal – A virtual drive whose members are all online.
In the output of the StorCLI commands, Optimal is displayed as optl.
Partially Degraded – A virtual drive with a redundant RAID level that is capable of sustaining
more than one member drive failure. This state also applies to the virtual drive's member
drives. Currently, a RAID 6 or RAID 60 virtual drive is the only virtual drive that can be partially
degraded.
In the output of the StorCLI commands, Partially Degraded is displayed as Pdgd.
Degraded – A virtual drive with a redundant RAID level with one or more member failures and
can no longer sustain a subsequent drive failure.
In the output of the StorCLI commands, Degraded is displayed as dgrd.
Offline - A virtual drive with on e or more member failures that make the data inaccessible.
In the output of the StorCLI commands, Offline is displayed as OfLn.
Drive state drive
subsystem
A collection of drives and the hardware that controls them and connects them to one or
more controllers. The hardware can include an intelligent controller, or the drives can
attach directly to a system I/O bus controller.
Drive type A drive property indicating the characteristics of the drive.
E
EKM External Key Management
Estimated time to
recharge
Estimated time necessary to complete recharge of the battery at the current charge rate.
Expected margin of
error
Indicates how accurate the reported battery capacity is in terms of percentage.
F
Fast initialization A mode of initialization that quickly writes zeroes to the first and last sectors of the virtual
drive. This allows you to immediately start writing data to the virtual drive while the
initialization is running in the background.
Fault tolerance The capability of the drive subsystem to undergo a single drive failure per drive group
without compromising data integrity and processing capability. LSI SAS RAID controllers
provides fault tolerance through redundant drive groups in RAID levels 1, 5, 6, 10, 50, and
60. They also support hot spare drives and the auto-rebuild feature.
Firmware Software stored in read-only memory (ROM) or programmable ROM (PROM). Firmware is
often responsible for the behavior of a system when it is first turned on. A typical example
would be a monitor program in a system that loads the full operating system from drive
or from a network and then passes control to the operating system.
Foreign configuration A RAID configuration that already exists on a replacement set of drives that you install in
a computer system. MegaRAID Storage Manager software allows you to import the
existing configuration to the RAID controller, or you can clear the configuration so you
can create a new one.
Formatting The process of writing a specific value to all data fields on a drive, to map out unreadable
or bad sectors. Because most drives are formatted when manufactured, formatting is
usually done only if a drive generates many media errors.
Full charge capacity Amount of charge that can be placed in the battery. This value represents the last
measured full discharge of the battery. This value is updated on each learn cycle when
the battery undergoes a qualified discharge from nearly full to a low battery level.
G
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