Data General AViiON 5500 Series, Installing, Expanding, And Maintaining

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Planning a SCSI bus configuration
3-7
014–002250–01
Table 3–1 Recommended SCSI IDs, controller numbers, and default device names
Drive SCSI ID Controller # Device name *
First disk on first SCSI bus
(system, or root disk)
First disk on
second bus
0
0
0
1
sd(ncsc(0,7),0)
sd(ncsc(1,7),0)
Second disk on first bus
Second disk on
second bus
1
1 0
1 sd(ncsc(0,7),1)
sd(ncsc(1,7),1)
Third disk on first bus
Third disk on
third bus
2
2 0
2 sd(ncsc(0,7),2)
sd(ncsc(2,7),2)
First CD-ROM (or 4th disk) on
first bus
First CD-ROM (or 4th disk) on
fourth bus 3
3
0
3
sd(ncsc(0,7),3)
sd(ncsc(3,7),3)
First (boot) tape on first bus
First tape on
fifth bus
4
4 0
4 st(ncsc(0,7),4)
st(ncsc(4,7),4)
Second tape on first bus
Second tape on
second bus
5
5 0
1 st(ncsc(0,7),5)
st(ncsc(1,7),5)
Third tape (or 2nd CD–ROM, or
5th disk) on first bus
Third tape (or 2nd CD–ROM, or
5th disk) on
third bus
6
6
0
2
sd(ncsc(0,7),6)
sd(ncsc(2,7),6)
*
The default controller ID parameter is 7; you do not need to specify this
parameter unless the specified SCSI bus is shared by more than one host
(dual–initiated).
Refer to your hardware operating manual, and to DG/UX
documentation for more information about device specifications.
Preparing drives
The SCSI devices you received with your system are preconfigured
to comply with the operating parameters of the controller and the
other drives on the SCSI bus. Before you install an internal or
external add-on SCSI device, you need to set its operating
parameters as described in this section.
If you add or replace devices anywhere on the SCSI bus, you must
set the IDs by positioning drive–select jumpers on the individual
device(s).