[mythtv-users] new rig ... help with specs

[Robin Hill]

On Tue Sep 22, 2009 at 09:34:04AM -0600, Brian Wood wrote:

> On Tuesday 22 September 2009 09:23:27 Chris Stevens wrote:
> > The situation with RAID hard drives is fairly straight-forward: buy the
> > enterprise versions - eg. Seagate 750 ES. These have MTB of around
> > 3,000,000 hours which is over 300 years and are only a bit more
> > expensive.
> >
> > But there is just one primary rule for any HD: KEEP THEM COOL. Drives go
> > very quickly if you let them overheat. You can actually buy any old
> > rubbish so long as you follow this rule.
> 
> I would think so as well, but:
> 
> The Google paper on hard drive reliability seemed to contradict this
> seemingly common sense idea.
> 
> They were unable to show much of a correlation between temperature and
> failure rates.
> 
The thing with the Google paper is that it was all done within
standard data centre operating conditions - when they showed no
correlation between failure and temperature, this is within a very
narrow range of temperatures.

Current thinking is that most data centres are being run at too low a
temperature - with proper airflow planning you should be able to run
them at (or slightly above) normal room temperature.  This doesn't,
however, (as I can personally attest) mean that drives will work quite
happily at 60 degrees (though modern CPUs appear okay at 90 degrees C),
just that there's no need to keep everything below 20.

Cheers,
    Robin
-- 
     ___        
    ( ' }     |       Robin Hill        <myth at robinhill.me.uk>  |
   / / )      | Little Jim says ....                            |
  // !!       |      "He fallen in de water !!"                 |
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