Hi All,

We have a multi-cluster environment consisting of:  1) a “traditional” HPC 
cluster running on commodity hardware, and 2) a DDN based cluster which is 
mounted to the HPC cluster and also exports to researchers around campus using 
both CNFS and SAMBA / CTDB.  Both of these cluster are currently running GPFS 
4.1.0.8 efix 21.

We are considering doing upgrades in May.  I would like to take the HPC cluster 
to GPFS 4.2.0.x not just because that’s the current version, but to get some of 
the QoS features introduced in 4.2.

However, it may not be possible to take the DDN cluster to GPFS 4.2.  I’ve got 
another inquiry in to them about their plans, but the latest information I have 
is that they only support up thru GPFS 4.1.1.x.

I know that it should be possible to run with the HPC cluster at GPFS 4.2.0.x 
and the DDN cluster at 4.1.1.x … my question is - is anyone actually doing 
that?  Any suggestions / warnings?

I should mention that this question is motivated by the fact that a couple of 
years ago when both clusters were running GPFS 3.5.0.x, we got them out of sync 
on the PTF levels (I think the HPC cluster was at PTF 19 and the DDN cluster at 
PTF 11) and it caused problems.  Because of that, we have tried to keep them in 
sync as much as possible.

Thanks in advance, all…

—
Kevin Buterbaugh - Senior System Administrator
Vanderbilt University - Advanced Computing Center for Research and Education
[email protected]<mailto:[email protected]> - 
(615)875-9633



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