[Beowulf] using two separate networks for different data streams

[ctierney at hypermall.net]

Quoting Ricardo Reis <rreis at aero.ist.utl.pt>:

> 
> Hi
> 
>   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?
> 

I have seen this done with systems that have a high performance
network (Myrinet, IB, etc.) and a gigE network for I/O.  If you
just have 2 gigE networks, it still should be easy to achieve.  Just
name the two interfaces differently.  Have the IO systems (NFS or other)
use the IO interface and have the MPI codes use the node names of
the other interface.  

Craig


>   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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