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CHAPTER 3: Before You Install: Getting Started
A device’s ID number will reflect the priority it has on the SCSI bus; except for
ID 7 (reserved for host adapters), the lower a device’s number, the higher its
priority. So you should assign lower numbers to the devices that you will need to
access more frequently or at a moment’s notice, and higher numbers to less critical
devices. (8-bit “Narrow” SCSI peripherals must use SCSI IDs 0 through 6; 16-bit
“Wide” peripherals can be assigned IDs 8 through 15 as well.) Here’s an example
setup:
0 Primary hard drive
1 Secondary hard drive
2 CD-R drive
3 DVD drive
4 Floppy drive
5 Tape drive
6 SCSI scanner
7 SCSI host adapter
::
15 (Other, low-priority SCSI peripherals)
When you assign SCSI IDs, we recommend that you leave the Ultra2 LVD SCSI
Host Adapter set for ID 7, its factory-default setting; use the Adapter’s firmware
configuration utility if you must change the ID number (see Section 4.6.4). If you
plan to boot your system from a SCSI hard-disk drive, set that drive to ID 0 for best
operation with most operating systems. (Most hard drives come from the factory
preset to ID 0.) Set the second hard drive, if you’re using one, to ID 1, and set
additional peripherals to sequentially higher IDs.
You can use the Windows 95 or 98 Device Manager to view the SCSI ID (and
other system-configuration parameters) assigned to each SCSI device attached to a
Windows 95 or 98 PC. You can do the same thing through just about any operating
system by accessing the Adapter’s SmartSCSI utility.