[Nbd] Clustering Questions

["J. Ryan Earl" <heretic@...15...>]

OK, as promised, have some more questions.

I'm looking to build a cluster of diskless machines with failover and
redundancy.  I was wanting to run RAID1 on a network based filesystem.
I was thinking I could possibly run RAID1 over NBD.  Has anyone done
this successfully?

I'm looking for a situation where I have N servers with a harddrive in
them, N > 1, let's call them masters.  Servers without harddrives I'll
call nodes.  Let's say I have 3 masters and 9 nodes.  I'm thinking each
of the master nodes will require their own seperate root filesystem,
with the 9 nodes booting off PXE (Pre-eXecution Environment?) via a
dhcpcd option that mounts the root as an md device across three NBDs.

Does this sound reasonable?  Are there any documents on this out there?

I've searched google and not found a whole lot.  One of the things I
read, and I don't remember where, was that you could swap across NBD.
Is this true?

Thanks,
-ryan