> > Hope this is not too much off-topic. I have a client who wants to setup a
> > high-availability linux server network. It's an ISP, so we're talking
> > mail/web/ftp/dns/etc. I would like to have 2 identical boxes, with
> > identical harddisks partitioned the same way, and to have the main box
> > constantly synchronize it's filesystem with the standby box, so that when
> > it fails, the standby just does an IP takeover, and has all the recent data
> > in place. I would really like to do this on the lowest possible level,
> > something like 'write this block to head x, cylinder y', instead of doing
> > cp over nfs every 5 minutes or so. Is there anything available that would
> > do something like that? If not, how easy would adding this to the kernel
> > be? Can it be done it all? My idea was to have the standby box run a
> > custom init binary, that would just sync the disks and wait for the other
> > box to die. When it dies, it runs the real init, everything comes up, and
> > the box takes over.
>
> raid1 over localdisk and nbd-mounted disk from other host is the
> answer.
I really like this idea. One question though - will this still work if both
machines run hardware raid?
-- Regards, Modemch
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