Acer PCI to Ultra SCSI RAID Controllers DAC960PG Bedienungsanleitung PDF herunterladen (Seite 80)

G-22 DAC960PG and DAC960PJ Installation Guide

Ultra SCSI (Fast 20 SCSI)

A high performance SCSI protocol that has a bus speed of 20 Megabytes per

second in the Narrow SCSI configuration and 40 MB in the Wide SCSI (Fast

20 Wide SCSI) configuration.

Ultra Wide SCSI

16-bit wide Ultra SCSI (IS devices), double the speed of narrow SCSI.

Ultra2 SCSI (Fast 40 SCSI)

A higher performance SCSI protocol than Ultra SCSI. Ultra2 SCSI has a bus

speed of 40 Megabytes per second in the Narrow SCSI configuration and 80

Megabytes in the Wide SCSI (Wide Ultra2 SCSI) configuration.

Wide SCSI

A SCSI protocol and signal definition providing 16-bit wide data path.

Write-Back Cache

A caching strategy whereby write operations result in a completion signal

being sent to the host operating system as soon as the cache (not the disk

drive) receives the data to be written. The target disk drive will receive the

data at a more appropriate time in order to increase controller performance.

An optional cache battery backup can be used to protect against data loss as

a result of a power failure or system crash.

Write-Through Cache

A caching strategy whereby data is written to the SCSI drive before a

completion status is returned to the host operating system. This caching

strategy is considered more secure, since a power failure will be less likely to

cause loss of data. However, a write through cache results in a slightly lower

performance.

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Acer PCI to Ultra SCSI RAID Controllers DAC960PG Bedienungsanleitung Seite 80