Re: Attachment order of scsibus*

[Brian Buhrow <buhrow%nfbcal.org@localhost>]

	Hello Edgar.  The attachment order on PCI busses is generally driven by the order in which
the devices appear on the various busses.  Historically, as I remember,  PCI slots are iterated
over starting with the slot nearest the power supply in most PC machines and working toward the
far side of the mother board.  
If you build a custom kernel, you can nail the sd indexes to the specific scsibusses they
attach to.  for example: sd0 at scsibus1 target 0.  
Then, the disks that are probed before sd0 will start numbering at sd1.  for example, sd1 at
scsibus0 target 0.
	However, because this can get messy very quickly, especially if you need to boot a
non-custom kernel for some reason, I'd suggest building partitions as wedges and using the
named partitions as identifiers in your /etc/fstab file.  If you're running a version of NetBSD
that doesn't support that, I'd suggest building raidframe  raid sets which automatically hide
all those attachment details once you enable auto-configuration.  Both of those options are
very nice when disks start appearing and disappearing on systems that have been in use for a
while.

Hope that helps.

-Brian