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boot disks

I have three ultra 60's all with dual external scsi harddrive bays, I removed all the internal drives.

Two of the come up on the install to
/dev/dsk/c0t1d0
/dev/dsk/c0t2d0

the other one has
/dev/dsk/c1t1d0
/dev/dsk/c1t2d0

Which one is right, and how do I correct it for the others?

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CMILLER
Asked:
CMILLER
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1 Solution
 
jlevieCommented:
Technically the odd one is the most correct. An Ultra 60 has two SCSI controllers. One is used for internal drives (c0) and the other (c1) is for externals. What I don't understand is why two show c0 for the external drives, it should show the drives as being on c1. How does the results of a 'probe-scsi-all' at the prom prompt compare?
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CMILLERAuthor Commented:
they are the same

/pci@1f,4000/scsi@3,1
target 1
unit 0
unit 1

Something I just noticed is that the two in question do not have a internal cdrom drive,
I have external cdroms on them

the one that has the c1t1d0 has a internal cdrom drive

would that make a difference?
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jlevieCommented:
> Something I just noticed is that the two in question do not have a internal cdrom drive

That explains it. On those machines there's nothing on the internal SCSI bus, so it probes as inactive and the external bus becomes controller 0 (c0). Having these two different configs aren't necessarily a problem. The only time it would matter is if you swapped a disk from a machine without a CDROM to the one that has one, or added an internal CDROM.

If you really need all three in the same config you could:

1) Move the internal CDROM to external
2) Move the external CDROMS to internal

Personally, I prefer (2) since that allows an internal disk to be plugged in at some point in the future without screwing up the controller assignments.
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CMILLERAuthor Commented:
Thanks
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