[Nut-upsdev] suggested interface for an MGE Galaxy 6000

Arjen de Korte nut+devel at de-korte.org
Thu Jul 26 14:36:52 UTC 2007

> Hi Arjen,
> Thanks for your note.  I'll watch for Arnaud Quette's comments.
> For my last cluster (U. Wisconsin - Milwaukee) we have one NUT server that
> happily controls more than 800 Linux boxes.  No obvious scaling problems
> there.

Good. Then the only problem could be the FD_SETSIZE limit, which is
limited to 1024 on some systems (or even lower than that). You could try
to redefine it to a higher value though.

> (And yes, we have tested that all the boxes shut down as they
> should.  We have also had a couple of clean shutdowns in the past year
> when power failed or was turned off without warning on campus.)

Nice to hear!

> If we do run into scaling problems, am I correct that we could have more
> than one NUT server (say one for each 500 boxes)?

You could, but that would require setting up dummy UPSes too. I don't
recommend that. Checkout the value of FD_SETSIZE on your system. If it is
larger than the number of clients you want to connect to your server, you
probably have nothing to worry about.

Best regards, Arjen

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