Lenovo ThinkServer RD650 User Manual page 413

12Gb/s MegaRAID SAS Software User Guide
March 2014
Read policy
Rebuild
Rebuild rate
Reclaim virtual drive
Reconstruction rate
Redundancy
Redundant
configuration
Relative state of
charge
Remaining capacity
Revertible hot spare
Revision level
Run time to empty
SAS
SATA
SCSI device type
Serial no.
Strip size
A controller attribute indicating the current Read Policy mode. In Always Read Ahead
mode, the controller reads sequentially ahead of requested data and stores the
additional data in cache memory, anticipating that the data will be needed soon. This
speeds up reads for sequential data, but there is little improvement when accessing
random data. In No Read Ahead mode (known as Normal mode in WebBIOS), read ahead
capability is disabled.
The regeneration of all data to a replacement drive in a redundant virtual drive after a
drive failure. A drive rebuild normally occurs without interrupting normal operations on
the affected virtual drive, though some degradation of performance of the drive
subsystem can occur.
The percentage of central processing unit (CPU) resources devoted to rebuilding data
onto a new drive after a drive in a storage configuration has failed.
A method of undoing the configuration of a new virtual drive. If you highlight the virtual
drive in the Configuration Wizard and click Reclaim, the individual drives are removed
from the virtual drive configuration.
The user-defined rate at which a drive group modification operation is carried out.
A property of a storage configuration that prevents data from being lost when one drive
fails in the configuration.
A virtual drive that has redundant data on drives in the drive group that can be used to
rebuild a failed drive. The redundant data can be parity data striped across multiple
drives in a drive group, or it can be a complete mirrored copy of the data stored on a
second drive.
A redundant configuration protects the data in case a drive fails in the configuration.
Predicted remaining battery capacity expressed as a percentage of Full Charge Capacity.
Amount of remaining charge capacity of the battery as stated in milliamp hours. This
value represents the available capacity or energy in the battery at any given time. The gas
gauge adjusts this value for charge, self-discharge, and leakage compensation factors.
When you use the Replace Member procedure, after data is copied from a hot spare to a
new drive, the hot spare reverts from a rebuild drive to its original hot spare status.
A drive property that indicates the revision level of the drive's firmware.
Predicted remaining battery life at the present rate of discharge in minutes.
S
Acronym for Serial-Attached SCSI. SAS is a serial, point-to-point, enterprise-level device
interface that leverages the Small Computer System Interface (SCSI) protocol set. The SAS
interface provides improved performance, simplified cabling, smaller connectors, lower
pin count, and lower power requirements when compared to parallel SCSI.
Acronym for Serial Advanced Technology Attachment. A physical storage interface
standard. SATA is a serial link that provides point-to-point connections between devices.
The thinner serial cables allow for better airflow within the system and permit smaller
chassis designs.
A drive property indicating the type of the device, such as drive.
A controller property indicating the manufacturer-assigned serial number.
The portion of a stripe that resides on a single drive in the drive group.
LSI Corporation
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Glossary