[Beowulf] real hard drive failures
nix at petelancashire.com
Sat Feb 5 10:07:56 PST 2005
The nice thing and about the only nice thing about using
a fan is in this case, the failure of a fan is not going
to kill you. If your mother board has a 3-wire fan 'port'
not used you can have it report failure.
In the past I've built using a 8pin MicroChip a simple
failure detector. I would think with some imagination
you could take a 555 + transistor + pizo buzzer and
create a simple alarm.
Another thing to use but I've not seen as an individual
item is a heat sink. The Sun SPUD brackets come with a
plate that attaches to the bottom of the drive, the plate
has been punched with hmmm .. louvers ?.
-pete "ah the days of so many fans you could not hear yourself talk"
On Tue, 2005-01-25 at 14:26, Mark Hahn wrote:
> > > I'm only partially interested in the thread "Cooling vs HW replacement" but
> > > the problem with drive failures is a real pain for me. So, I thought I'd
> > > share some of my experience.
> > i'd add 1 or 2 cooling fans per ide disk, esp if its 7200rpm or 10,000 rpm
> > disks
> I'm pretty dubious of this: adding two 50Khour moving parts to
> improve the airflow around a 1Mhour moving part which only dissipates
> 10W in the first place? designing the chassis for proper airflow
> with minimum fanage is obviously smarter and probably safer.
> > - if downtime is important, and should be avoidable, than raid
> > is the worst thing, since it's 4x slower to bring back up than
> > a single disk failure
> eh? you have a raid which is not operational while rebuilding?
> > - raid will NOT prevent your downtime, as that raid box
> > will have to be shutdown sooner or later
> > ( shutting down sooner ( asap ) prevents data loss )
> huh? hotspares+hotplug=zero downtime.
> but yes, treating whole servers as your hotspare+hotplug element is
> a nice optimization, since hotplug ethernet is pretty cheap vs
> $50 hotplug caddies for each and every disk ;)
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