Acer SmartRAID V Uživatelský manuál stáhnout pdf (Strana 248)

G-8

Glossary

Termination

A method of matching the transmission

impedance of an electrical bus so that signal

reflections are minimized or eliminated.

TERMPWR

A signal line on the SCSI bus that supplies

electric power for SCSI bus terminators.

Throughput

A term used to describe the amount of data that

can be processed or transmitted by a system in

a given amount of time.

Tree View

The view in SMOR that provides a graphic

display of all controllers and devices on the

system in a hierarchical format. When a device

is highlighted in the Tree View, a corresponding

Information View is displayed that provides

specific information about that device.

Ultra SCSI

The SCSI-3 specification that defines

synchronous data transmission rates of up to

20MHz. This transfer rate provides data

transfer of up to 20MB/sec on an 8-bit bus and

40MB/sec on a 16-bit bus. Ultra SCSI is also

called Fast-20 SCSI.

Ultra2 SCSI

The SPI-2 specification that defines

synchronous data transmission rates of up to

40MHz. This transfer rate provides data

transfers of up to 40MB/sec on an 8-bit bus and

80MB/sec on a 16-bit SCSI bus. Ultra2 SCSI is

also called Fast-40 SCSI.

VHDCI

Very High Density Cable Interconnect. The

small industry standard 68-pin external

connector used on DPT SmartRAID V SCSI

controllers.

Wide SCSI

A SCSI protocol and signal definition that

provides a data path more than 8-bits wide.

Wide SCSI buses can support both 8- and 16-bit

data transfers. All SmartRAID V controllers use

a 16-bit SCSI interface.

WORM

Write Once Read Multiple – An optical storage

device similar to a CD-ROM that can write data

one time only to any location on a removable

optical disk. WORM drives are primarily used as

data archive devices because once written, the

data can never be erased.

Write-Back

A method postponing an actual data write

operation to a slower device, such as a disk

drive, by saving the data in a cache. The data

can then be written at a time when the device

would otherwise be idle.

Write-Through

Data is written to directly to the final destination

before a write operation is reported as

complete.

XOR

Exclusive OR. A logical operation performed on

two binary operands which yields a 0 for every

bit position where the operands are both 1 or

both 0, and a 1 in every bit position when the

operands are dissimilar.

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