Exabyte VXA-2, Руководство по эксплуатации продукта, Страница: 84 / 90

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RODUCT
M
ANUAL
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Chapter
Setmark A mark written by the tape drive to allow fast searching to a point
on the tape without having to know the number of records or filemarks that
precede the point. A setmark is a special recorded element within a partition,
that contains no user data, and provides a segmentation scheme hierarchically
superior to filemarks for use in addressing or fast positioning on high-capacity
storage devices (also called Save-Set Mark).
Streaming An operational mode that occurs when the data transfer rate to or
from the host closely matches the tape drive’s data transfer rate, allowing the
tape drive to read or write data in a continuous stream.
Termination In SCSI, termination refers to placing a resistor (terminator) at
both physical ends of the SCSI bus to prevent signal reflection.
Transfer rate The transmission speed of a communications line. The tape
drive transfer rates are measured in megabytes per second (MB/sec).
Variable Speed Operation (VSO) The VXA technique for adjusting tape
motion to match the host transfer rate, eliminating “backhitching.” This
technique optimizes backup and restore times, while enhancing media and
drive reliability.
Volume A recording medium together with its physical carrier (a single tape
cartridge).
VXA VXA is a breakthrough tape technology that offers previously
unobtainable levels of reliability, data availability and interchange, and
recoverability, capacity and interchangeability. This is accomplished through
the exclusive combination of OverScan Operation (OSO), Variable Speed
Operation (VSO) and Discrete Packet Format (DPF).