Scsi Guidelines For Optimizing Performance - Compaq SP700 Reference Manual

When an external SCSI device is connected to the external SCSI
connector on the rear panel of the workstation, that device becomes the
end of the SCSI chain and must be terminated.
SCSI drives on channel 2 of the SCSI controller must be either internal
or in an external storage system, but not both.
SCSI Guidelines for Optimizing
Performance
To maintain Ultra speeds, do not install more than four SCSI devices on
each channel.
For best performance, do not mix Wide-Ultra and narrow SCSI devices
on either the same SCSI cable or the same channel.
Because channel 1 of the integrated Dual Wide-Ultra SCSI controller is
connected to the preinstalled Wide-Ultra SCSI hard drive in the
removable hard drive cage, use channel 2 for any narrow SCSI devices.
For example, if you have narrow devices installed in bays 5 and 6,
connect these devices to channel 2 of the integrated Dual Wide-Ultra
SCSI controller.
For additional information about optional SCSI devices, refer to the
documentation included with the device or contact your Compaq authorized
dealer, reseller, or service provider.
Compaq Professional Workstation SP700 Reference Guide
8-15