I tried two (almost identical) entries in the map dataset for autofs, but if
the first one is not successfull, it doesnt even try the second entry.
I'm am not sure if doing this is possible with the kernel-based autofs
automounter.
What I am sure about that this is possible using the AMD automounter,
which is also a Debian package. Take a look at http://tinyurl.com/2eafe
and in particular section 9.6.1., which is an expansion of the what
I found in http://tinyurl.com/2hvra.
The above deals only with the 'fallback' handling, but it would be
trivial to specify that the fallback is not to mounted with fstype nfs,
but with smb instead.
Alexis