Spectra Logic 10000 User Manual download pdf (Page 118)

Appendix A. Library Specifications

118

The SCSI Bus

When considering SCSI bus configuration, be sure to note:

• Whether the bus and attached devices are single-ended, low-voltage differential

(LVD) or high-voltage differential (HVD)

• Whether the bus and attached devices are fast/slow or wide/narrow

Single-Ended, LVD, or HVD

All SCSI devices attached to a bus must be of the same type, either single-ended, LVD

or HVD; this includes the drives, the adapter card and the terminators. Single-ended

devices use one line to transmit bus signals between devices. Differential devices use

two lines to transmit bus signals between devices.

• A single-ended SCSI bus has a maximum length of 1.5 feet with fast/wide device.

• An LVD SCSI bus has a maximum length of 39.4 feet.

• An HVD SCSI bus has a maximum length of 82 feet.

Fast/Slow and Wide/Narrow SCSI

Fast/slow and wide/narrow refer to the signal configuration for different kinds of SCSI

busses. The Spectra 10000 library uses the SCSI fast/wide standard.

• Slow SCSI means that the bus used allows transfer speeds of 5 MB/sec to

10 MB/sec, depending on bus width.

• Ultra-2 SCSI and Wide Ultra-2 SCSI allow transfer speeds of 40 MB/sec to

80 MB/sec.

• Fast SCSI means that the bus used allows transfer speeds of 10 MB/sec to

20 MB/sec, depending on bus width.

• Narrow SCSI means that the bus used is 8 bits wide.

• Wide SCSI means that the bus used is 16 bits wide.

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Spectra Logic 10000 User Manual Page 118