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
Max error Expected margin of error (percentage) in the state of charge calculation.
For example, when Max Error returns 10 percent and Relative State of Charge returns 50
percent, the Relative State of charge is more likely between 50 percent and 60 percent.
The gas gauge sets Max Error to 100 percent on a full reset. The gas gauge sets Max Error
to 2 percent on completion of a learn cycle, unless the gas gauge limits the learn cycle to
the +512/–256-mAh maximum adjustment values. If the learn cycle is limited, the gas
gauge sets Max Error to 8 percent unless Max Error was already below 8 percent. In this
case Max Error does not change. The gas gauge increments Max Error by 1 percent after
four increments of Cycle Count without a learn cycle.
Maximum learn delay
from current start
time Maximum length of time between automatic learn cycles. You can delay the start of a
learn cycle for a maximum of 168 hours (7 days).
Media error count A drive property indicating the number of errors that have been detected on the drive
media.
Migration The process of moving virtual drives and hot spare drives from one controller to another
by disconnecting the drives from one controller and attaching them to another one. The
firmware on the new controller will detect and retain the virtual drive information on the
drives.
Mirroring The process of providing complete data redundancy with two drives by maintaining an
exact copy of one drive’s data on the second drive. If one drive fails, the contents of the
other drive can be used to maintain the integrity of the system and to rebuild the failed
drive.
Multipathing The firmware provides support for detecting and using multiple paths from the RAID
controllers to the SAS devices that are in enclosures. Devices connected to enclosures
have multiple paths to them. With redundant paths to the same port of a device, if one
path fails, another path can be used to communicate between the controller and the
device. Using multiple paths with load balancing, instead of a single path, can increase
reliability through redundancy.
N
Name A virtual drive property indicating the user-assigned name of the virtual drive.
Next learn time Time at which the next learn cycle starts.
Non-redundant
configuration A RAID 0 virtual drive with data striped across two or more drives but without drive
mirroring or parity. This provides for high data throughput but offers no protection in
case of a drive failure.
NVRAM Acronym for nonvolatile random access memory. A storage system that does not lose the
data stored on it when power is removed. NVRAM is used to store firmware and
configuration data on the RAID controller.
NVRAM present A controller property indicating whether an NVRAM is present on the controller.
NVRAM size A controller property indicating the capacity of the controller’s NVRAM.
O
Offline A drive is offline when it is part of a virtual drive but its data is not accessible to the virtual
drive.
P