Mylex eXtremeRAID Installation Guide download pdf (Page 18)

2-4 eXtremeRAID Installation Guide

SCSI Cabling

The controller supports up to three Ultra2 SCSI channels. Each channel

supports up to 15 devices.

LVD Mode

The controller supports Ultra2 SCSI with LVD. If all drives attached to a

controller drive channel support Ultra2 SCSI with LVD, then that channel

will operate at 80 MB. This setup allows a maximum SCSI bus length of up

to 12 meters.

☛

Note

The SCSI bus length can be extended up to 25 meters

if only the controller and one drive are on the bus in a

point-to-point configuration.

Single-ended Mode

If any device on the channel does not have LVD electrical characteristics, the

channel will revert to single-ended operation mode. The SCSI bus lengths

will then be limited to the single-ended bus lengths shown in Table 2-1.

* The Maximum number of devices allowed on a Wide Ultra SCSI bus is 8, unless bus

extender technology is used.

† This length can be extended to 25 meters if there are only 2 devices (e.g., the controller and

one drive) on the bus in a point-to-point configuration.

Table 2-1. Supported SCSI Formats and Bus Lengths

SCSI Trade Association

(STA) Terms

Bus

Speed,

MB/Sec,

Max.

Bus

Width,

Bits

Max. Bus Length, Meters Max. Device

Support

(Including

Controller)

Single-ended Low-Voltage

Differential

SCSI-1 5 8 6 - 8

Fast SCSI 10 8 3 - 8

Fast Wide SCSI 20 16 3 - 16

Ultra SCSI 20 8 1.5 - 8

Ultra SCSI 20 8 3 - 4

Wide Ultra SCSI 40 16 - - 16*

Wide Ultra SCSI 40 16 1.5 - 8

Wide Ultra SCSI 40 16 3 - 4

Ultra2 SCSI 40 8 Not Defined 12† 8

Wide Ultra2 SCSI 80 16 Not Defined 12† 16

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 73 74

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Mylex eXtremeRAID Installation Guide Page 18

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