supplied by another device. Therefore, you do not need to worry
about terminator power when connecting DARWIN.
The more devices you have connected to SCSI and the longer your
cables are, the more it becomes important to have the cables prop-
erly terminated.
Terminator Connected
to the End of the SCSI Chain
Ultra DISKUltra DISK
ID #1ID #2
-3OO-300:00:00:08
-20-29-36-44-20-29-36-44I-6-9-12-15-6-9-12-15
System Routing Project VersionEditLocateDECINC
ABCDEF
VOLUME12345678GHIJKLMNOEXIT123
456
RTZRWDFFDSTOPPLAYRCDPRSTUVWXYPHONESPUNCHREHEARSEUSER 1USER 278QZ9
STO/LOC0.GOTO
DARWIN is ID #7
DARWIN model 4001 - Internal Drive = ID #0
SCSI Problems
In diagnosing SCSI problems the first rule is: Don't panic, experi-
ment! If you have several SCSI devices hooked up, first check the
SCSI ID numbers for conflicts, then try disconnecting one of the
devices and maybe change the order of the units on the line. There
are quite a number of different SCSI drives on the market each with
slightly different electrical characteristics. The following checklist
may help you find the solution to your unique SCSI setup.
1. Make sure the drive is mounted. Mount the drives using the
Mount Drive utility (System, Disk).
2. Check the SCSI ID numbers. No two numbers on the bus can
be the same.
3. Are the ends of the SCSI bus terminated?
4. Read the documentation again. Learn all you can about your
peripheral devices. The answer to your problem may be right in
front of you.
5. Play with the order in which devices are powered up. Nor-
& Exception to the Big Bang
mally the OBig Bang� method works best (turn everything on at
Method: Power up the SCSI DAT
drive FIRST and wait a second beforeonce), but another order may work better in your unique sys-
powering up DARWIN.tem. Experiment!
6. Always suspect the cable when something doesn't work on
the SCSI bus. Remember: The shorter the cables are, the better.
7. Simplify the situation. Disconnect one or more drives until you
get the system to work.
8. If all else fails, call us. We're here if you need us. 408-438-1921
Telephone support hours are 9:00 to 5:00 PST, Monday - Friday.
9 - Reference Section97 |
ACEC
