Expanding Your System
Table 3-3. SCSI Address Recommendations
SCSI Address (ID)
Device (Drive) Recommended
0
System disk (where your operating system resides)
1
Expansion/hard disk drive
2
Expansion/hard disk drive
3
Expansion/hard disk drive
4
CD-ROM drive
5
Expansion module or SCSI tape drive
6
Expansion
7
Host adapter (SCSI controller)
SCSI Termination
The Digital AlphaStation 400 Series system has a built-in SCSI bus that can be connected
to both internal (inside the system box) and external SCSI peripherals. Termination is
required at both the internal and external ends.
Internal Termination
The internal SCSI bus cable contains the proper termination. If you add SCSI peripherals
inside the system box, make sure that any termination on the new peripheral is disabled.
Refer to the appropriate drive manual to disable the new peripheral's termination.
External Termination
When no external peripherals are present, use the console firmware to terminate the
external portion of the SCSI bus. If you use the SRM console, type
>>> Set
Control_SCSI_term internal
. If you use the ARC console, go the
Machine
specific setup menu...
and select set SCSI termination to internal. This is the
default setting.
If you add external SCSI peripherals, use the SRM console to set the value of the
environment variable control_scsi_term to external, or use the ARC machine specific
setup menu to set SCSI termination to external. Make sure that the last peripheral on the
external SCSI bus is properly terminated.
________________________ CAUTION __________________________
Failure to properly set up the SCSI termination can result in loss of data or
damage to the file system.
____________________________________________________________
F
See Appendix A, Console Commands, for more details.
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Содержание Digital AlphaStation 400 Series
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