Dear Greg,

Thank you very much for thte suggestions.

> You're going to be hard-pressed to have device naming be consistent.  
> I
> believe the kernel under CentOS 6 probes devices depth-first rather 
> than
> the older breadth-first method.  You can force this back by adding 
> the
> kernel boot option "pci=bfsort", and maybe that will help.

I have tried both pci=bfsort, pci=nobfsort and pci=nosort both on the 
install side (in /tftpboot/...) and by modifying grub.conf on the 
localboot side (on a client). Unfortunately, it doesnt seem to do any 
difference in the existing ordering.

> I've personally had SAN devices show up as sda before, which led me 
> to
> remove all unnecessary modules from the SystemImager boot kernel.
> Sometimes those virtual devices are virtually attached via USB.  If 
> so,
> you could remove USB support.

Hmm.. Really, I should think that I would _need_ that support (on 
install time)
in order to make the virtual device be detected and configured as sda, 
rather
than _not_ having support. Also, the only keyboard available on the 
nodes is a
virtual one on the USB-line, also connected through the iLO interface.
In the present case, it seems that the virtual CD _is_ detected on 
install time,
but it happens late, so sg0=sda is already assigned to the HDD.

> You could also alter your master script to
> detect if the virtual drive is sda and automatically format sdb 
> instead,
> but eliminating unnecessary devices is probably the better solution.

I am now trying this solution. As all the nodes are really identical, I 
can
hardcode the change rather than detecting it. But it feels like a 
clumsy hack.

Obviously, I must be careful not to make disk edits to the image, as 
the
disk should be sdb when the node boots (but sda while it installs). And
there is a small matter of getting grub (systemconfigurator) to do the 
right
thing as well...

> -Greg



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