[Beowulf] using two separate networks for different data streams
deadline at clustermonkey.net
Thu Jan 26 16:35:22 EST 2006
Obviously two network interfaces are needed per node for this
to work. Most motherboards now come with two Ethernet interfaces so this
has become a more standard way of doing things.
The way it is done is as follows. You setup two networks.
For example, your /etc/hosts file looks something like:
#compute network 192.168.0
#admin network 192.168.1
Where node1-compute and node1-admin are the same physical node, etc.
When you mount NFS in the /etc/fstab you do it over the *-admin network.
When you run an MPI job your node list is made of *-compute
It is often easier to use a cluster distribution to do this. Doing it by hand
can be tedious and error prone)
If you take a look at:
you can see how we did it using warewulf (quite easy).
> I've looked around, in the list and google and didn't find anything
> elucidating enough on this so mabe someone could englight me or point me
> where to look.
> I've seen architectures with two network switchs, one is used for I/O
> (writing, reading, so on) and another for message passing (MPI). how is
> this achieved? I get the idea, from one place, where the applications
> running must be aware of this but I was thinking that for this to work it
> must be transparent to the application. How can this be achieved?
> Any thought will be appreciated.
> best regards,
> Ricardo Reis
> "Non Serviam"
> n.p.: http://radio.ist.utl.pt
> n.r.: http://atumtenorio.blogspot.com
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