Users guide

Intel® RAID Software User Guide 338
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
The 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.