On Wed, 2009-04-29 at 11:21 -0700, John Bushnell wrote:
> Another reason for not having UPS power for an entire cluster is
> cooling. In our server room, if we lose regular power, we lose our
> large AC units as well. So we need to be careful what we keep plugged
> into our emergency power circuits (a relatively tiny amount of
> equipment). Having an entire stack of nodes churning away during a
> power outage would kill us pretty quickly.
The alternative approach is to UPS everything. Which is what we do.
Although we only have a short run-time installed which will bridge us to
the diesel generator.
In the event that the diesel doesn't kick-in the cluster will cleanly
shut itself down and wait for the UPS to tell it everything is back to
normal (or until an admin intervenes, whichever comes first).
Thanks,
Huw
--
Huw Lynes | Advanced Research Computing
HEC Sysadmin | Cardiff University
| Redwood Building,
Tel: +44 (0) 29208 70626 | King Edward VII Avenue, CF10 3NB
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