On 02/07/2013 03:05 PM, Jeremy Coles wrote:
> Dear All,
>
> I would like to understand whether any GridPP sites have a strong need to move their WNs to SL6 and what would the sysadmins on this list consider as a reasonable timeline on which to migrate their WNs to SL6?
>
Hi Jeremy,
We (Liv) don't "need" to move yet. There are some technical issues
surrounding the migration, and we might need to do a bit of
research.
Can a cluster be mixed sl5 and sl6 and run the same jobs, i.e.
is it a big bang or an incremental migration?
If it's an incremental migration, we can put (say) 4 x WNs on SL6
and see how it goes. It's dead easy, and no risk.
But if it's a big bang migration, we need more coordination.
If we want to be able to rollback, we will need separation, via
some scheme (spare CEs, two batch head nodes, two queues,
scheduling rules or whatever). We'd make the transition to
the new SL6 setup, and gradually retire one set while bringing the
other on line. But this will need some careful thinking through
to dodge the constraints!
Does anyone already have a good plan in their back pocket? Can I see
it, please?
Steve
> Many thanks,
> Jeremy
--
Steve Jones [log in to unmask]
System Administrator office: 220
High Energy Physics Division tel (int): 42334
Oliver Lodge Laboratory tel (ext): +44 (0)151 794 2334
University of Liverpool http://www.liv.ac.uk/physics/hep/
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