Avago Technologies AcceleRAID 150 - Manual (Page 54)

SCSI Cabling for AcceleRAID 150 (Standard and SISL)
A-2 AcceleRAID 150 Installation Guide
SCSI Cabling for AcceleRAID 150
(Standard and SISL)
An Ultra SCSI or an Ultra2 SCSI channel supports up to 15 SCSI devices.
Examples of SCSI devices include hard disk, tape, and CD-ROM.
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Caution
Wide and narrow SCSI cables must not be installed
together on any one channel, or the AcceleRAID
controller may not work properly.
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/sec per bandwidth with Wide Ultra2 SCSI. This setup
allows a maximum SCSI bus length of up to 12 meters. See the topic about
connecting the SCSI cables for both standard and SISL installations in
Chapter 2.
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Note
The SCSI bus length can be extended to 25 meters if
only the controller and one drive are on the bus.
☛
Note
Definition: The SCSI bus length is defined as the total
physical distance between the terminators, including
space needed for cables, connectors, and devices.
(See the illustrations under the termination sections
and notice the placement of the terminator “ T ”
symbol indicating termination at the farthest ends of
the configuration.)
Single-ended Mode
If any device on the channel is not Ultra2 SCSI capable, the channel will
revert to single-ended mode. The SCSI bus lengths will then be limited to the
single-ended bus lengths shown in Table A-1.