Installation guide

SCSI Cabling
2-6 AcceleRAID Installation Guide
SCSI Cabling
An Ultra SCSI or an Ultra2 SCSI channel supports up to 15 drives.
m Caution
Wide and narrow SCSI drives must not be installed
together on any one channel, or AcceleRAID
controller malfunction may occur.
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 40 mega-transfers per second (or 80 MB with Wide Ultra2
SCSI). This setup allows a maximum SCSI bus length of up to 12 meters.
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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.
Single-ended Mode
If any device on the channel is not Ultra2 SCSI capable, 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.