Acer SmartRAID V Bedienungsanleitung Seite 242

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Seitenansicht 241
G-2
Glossary
Adapter
SCSI Host Bus Adapter or HBA
ANSI
American National Standards Institute.
Arbitrated Loop
See FC-AL.
Array Group
A group of disk drives that appear to the
computer as a single logical drive. RAID 0,
RAID 1 and RAID 5 array groups can be
composed of any combination of individual disk
drives.
ASIC
Application Specific Integrated Circuit. An
integrated circuit chip designed for a specific
task rather than a general purpose design such
as a microprocessor.
ASPI
Advanced SCSI Programming Interface. A
protocol used by many SCSI drivers to
communicate with SCSI controllers under
MS-DOS, OS/2 and NetWare.
Asynchronous
Data transfer protocol that is not synchronized
to a set timing interval. Asynchronous SCSI data
transmitting devices must wait after each byte
for acknowledgment from the receiving device.
Either device can take as long as it needs to
send or acknowledge data. Asynchronous SCSI
has no defined maximum transfer rate but is
typically limited to between 1.5 and 3MHz.
BIOS
Basic Input Output System. A ROM-based
collection of device drivers and system start-up
routines which is provided as an integral part of
a computer. The BIOS provides enough
intelligence to enable the computer to
understand some simple keyboard commands
and load the operating system from disk on
power-up.
Bridge Controller
A device which appears as a single device on the
bus, but which bridges to multiple devices.
Bridge controllers are typically used to
overcome limitations on the number of devices
that can be on a single bus or to control remote
subsystems.
Build
The operation of initializing a redundant array
by creating consistent redundant information.
In the case of a RAID 1 array, data from one
drive is copied to a second drive. In the case of
RAID 5 arrays, parity information is generated
by XORing the disk data.
Burst
A term used to describe data words which are
transmitted as a single group across a bus
without interruption by another device.
Bus Mastering
A method of data transfer that allows data to be
moved between a peripheral controller and
system memory without interaction with the
host CPU or a DMA controller. This technique
allows the peripheral controller to take control
of the system bus and move data at the
maximum speed supported by the bus.
Cache
A temporary storage area (usually RAM) for
data that would normally be accessed from a
slower storage device. A cache management
algorithm monitors the data access patterns
and selects which data from the slower device is
to be kept in the cache for quick access. Caches
are normally transparent to or hidden from the
accessing device.
CD-ROM
Compact Disk Read-Only Memory. A read-only
storage device that can retrieve data from a
removable optical storage disk similar to an
audio compact disk.
Command Queuing
A feature that allows multiple I/O commands to
be executed by a peripheral controller in a more
efficient order.
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