Spectra Logic 2K User Manual download pdf (Page 80)

Appendix B. SCSI Cable and Terminator Requirements

The maximum length of the SCSI cable (including the internal and the external cable)

depends on the SCSI configuration:

• Single-ended SCSI maximum allowable bus length is 1.5 meters (4.5 feet) including

the 60 centimeters (24 inches) of cabling inside the library.

• Differential SCSI maximum allowable bus length is 20 meters (60 feet) including the

60 centimeters (24 inches) of cabling inside the library.

• LVD SCSI

maximum allowable bus length is 12 meters (39 feet) including the 60

centimeters (24 inches) of cabling inside the library.

Note: The entire bus (including host bus adapter, devices, and terminator)

must be LVD to operate in LVD mode. Attaching any single-ended

SCSI device to an LVD bus renders the entire bus, including all

devices, subject to the limits for the maximum specification

requirements for single-ended SCSI.

For maximum performance with a single-ended SCSI interface,

Spectra Logic recommends that you attach the Spectra 2K library as

the only device on the SCSI bus.

Follow these steps to determine if your SCSI configuration complies with the maximum

cable length specifications:

1. Measure the length of the SCSI cables between each device on the

SCSI bus.

2. Add these lengths together.

3. To that sum, add 60 centimeters (24 inches) for the cabling inside

each library.

For single-ended libraries, this total must not exceed 1.5 meters in length.

LVD configurations must not exceed 12 meters in length.

Differential configurations must not exceed 20 meters in length.

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Spectra Logic 2K User Manual Page 80