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SCSI bus on a disk array controller. Each disk array controller provides at
least one channel.
Conservative Cache
An operating mode in which system drives configured with the write-back
caching policy are treated as though they were configured for write-through
operation and the cache is flushed.
Consistency Check
A process that verifies the integrity of redundant data. A consistency check
on a RAID 1 or RAID 0+1 configuration (mirroring) checks if the data on
drives and their mirrored pair are exactly the same. For RAID Level 3 or
RAID Level 5, a consistency check calculates the parity from the data
written on the disk and compares it to the written parity. A consistency check
TM
from Mylex utilities such as Global Array Manager
(GAM) or RAID
TM
EzAssist
give the user the ability to have a discrepancy reported and
corrected. See also Parity Check.
Data Transfer Rate
The amount of data per unit of time moved through a channel or I/O Bus in
the course of execution of an I/O load, usually expressed in MBps.
DB-9
A type of connector used for serial interfaces.
Device Driver
A software program that controls a particular type of device attached to a
computer, such as a RAID subsystem, printer, display, CD-ROM, disk drive,
etc.
DIMM
Dual In-line Memory Module, a circuit board that has memory chips. Instead
of installing two SIMMs for the 64-bit memory path on a Pentium processor,
one DIMM can be installed. See also SIMM.
Disk
A non-volatile, randomly addressable, re-writable data storage device,
including rotating magnetic and optical disks as well as solid-state disks or
other electronic storage elements.
G-4
AcceleRAID 352 Installation Guide
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