Re: ext3 journal on software raid (was Re: PROBLEM: Kernel 2.6.10 crashing repeatedly and hard)

[ptb@lab.it.uc3m.es (Peter T. Breuer)]

maarten <maarten@ultratux.net> wrote:
> On Tuesday 04 January 2005 17:21, Peter T. Breuer wrote:
> > Maarten <maarten@ultratux.net> wrote:
> 
> 
> > > Nope, not 10 years, not 20 years, not even 40 years.  See this Seagate
> > > sheet below where they go on record with a whopping 1200.000 hours MTBF. 
> > > That translates to 137 years.
> >
> > I believe that too.  They REALLY have kept the monkeys well away.
> > They're only a factor of ten out from what I think it is, so I certainly
> > believe them.  And they probably discarded the ones that failed burn-in
> > too.
> >
> > > Now can you please state here and now that you
> > > actually believe that figure ?
> >
> > Of course. Why wouldn't I? They are stating something like 1% lossage
> > per year under perfect ideal conditions, no dust, no power spikes, no
> > a/c overloads, etc. I'd easily belueve that.
> 
> No spindle will take 137 years of abuse at the incredibly high speed of 10000 
> rpm and not show enough wear so that the heads will either collide with the 

Nor does anyone say it will! That's the mtbf, that's all. It's a
parameter in a statistical distribrution. The inverse of the
probability of failure per unit time.

Peter