Exabyte VXA-2, Руководство по эксплуатации продукта, Страница: 57 / 90

D
ECEMBER
2003 VXA-2
47
SCSI I
NTERFACE
R
EQUIREMENTS
SCSI I
NTERFACE
R
EQUIREMENTS
The VXA-2 tape drive is available with a wide, Ultra2 low-voltage differential
(LVD) SCSI interface. This section provides general information about the
specifications for the tape drive’s Small Computer System Interface (SCSI),
including:
4
SCSI cable requirements
4
SCSI connector requirements
4
Terminator requirements
I
NTERNAL
M
ODEL
This section describes the cable, connector, and terminator requirements for
the internal LVD SCSI tape drive.
SCSI Cable Requirements
The cable connected to the tape drive SCSI connector must meet the LVD
specifications listed in Table 7-3 .
Important
To avoid SCSI bus hangs, do not connect the tape drive to
an HVD SCSI bus.
Although the LVD SCSI interface is compatible with
single-ended SCSI buses, Exabyte does not recommend
using the tape drive in a single-ended SCSI environment
for the following reasons:
4
The tape drive will be forced to operate as a single-ended
device. The maximum burst data transfer rate on a wide,
single-ended SCSI bus is 40 MB/second, which is only
half the maximum provided by an LVD SCSI bus.
4
If the bus is shared by multiple devices, using a
single-ended bus may negatively impact the tape drive’s
performance.
4
The maximum cable length for a single-ended bus is
much shorter than for an LVD bus. Exceeding the
maximum cable length can result in an unstable bus.
Caution
Using a noncompliant SCSI cable will degrade VXA-2 performance and can cause
random, nonreproducible errors. Exabyte recommends using shielded cables.