[Beowulf] iptaled

Chris Samuel csamuel at vpac.org
Thu Sep 29 22:03:24 PDT 2005

On Fri, 30 Sep 2005 12:53 pm, Glen Gardner wrote:

> Exposing compute nodes and even I/O servers to the outside is common in
> grids. The idea is that many remote small systems can be linked via an
> external network to form a supercomputer.  The big problem is the
> latency in cross country links. Security can be handled well enough.

Umm, we're not doing this for our grid, in fact in some cases even the head 
nodes of the clusters are not guaranteed to be visible to the outside world - 
so we're having to create gateway systems (using Xen) running Globus 2 & 4 
(and LCG) that qsub jobs onto those nodes remotely.

The only reason I can see for this is MPICH-G2, which does require public IP 
addresses, but nobody is using that here.  Our main focus at the moment is to 
simplify access to existing cluster applications.

We're not trying to build grid applications that span clusters because 
firewall administrators here get twitchy enough about opening up even the 
port ranges that Globus uses, plus there's the fact that address space seems 
to be guarded fairly closely here.

> Setups like this are common , really.

Not in Australia. :-)

 Christopher Samuel - (03)9925 4751 - VPAC Deputy Systems Manager
 Victorian Partnership for Advanced Computing http://www.vpac.org/
 Bldg 91, 110 Victoria Street, Carlton South, VIC 3053, Australia

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