Sun Microsystems SPARCstorage Library Installation And User Manual page 141

Additional SCSI Buses
If the SCSI bus length exceeds 6 meters or you have to install more than six
SCSI devices, you can install some of the devices on additional SCSI buses by
installing an SBus SCSI Host Adapter card (SSHA) or a FSBE/S with desktop
systems or an SBE/S SBus card with deskside systems. The SBus SCSI Host
Adapter card provides an additional SCSI port (SCSI bus) for your system. The
SBE/S or FSBE/S SBus card provides an additional SCSI port and an Ethernet
port.
When you insert an SBus SCSI Host Adapter card into your system, the SCSI
bus length total does not include the internal cable length of the system, listed
in Table B-2. Additional SCSI buses, SCSI bus 1, 2, 3, and 4 are named based on
the order they are found by the OpenBoot™ PROM when probing SBus slots.
SBus slots are probed in this order: on-board, slot 0, slot 1, slot 2, slot 3.
For example, if the first FSBE/S SBus card is in slot 2, when the system probes
the SBus slots, it begins probing the on-board SCSI bus, then SBus slot 1, then
SBus slot 2, and so on. Because slot 2 contains the first FSBE/S SBus card, this
is SCSI bus 1. As Table B-2 illustrates, SCSI bus 1 supports disk, tape, and
CD-ROM.
Table B-2 Devices Supported With Additional Single-ended SCSI Buses (SunOS 4.1.x)
SCSI Bus Number
SCSI bus 1, first FSBE/S SBus card
SCSI bus 2, second FSBE/S SBus card
SCSI bus 3, third FSBE/S SBus card
SCSI bus 4, fourth FSBE/S SBus card
Note – For the Solaris 2.x operating system, tape, disk and CD-ROM devices
are supported on all SCSI buses
Small Computer Systems Interface Information
Device
Disk
Tape
CD-ROM
Disk
Disk
Tape
CD-ROM
Disk
B
B-5