Re: Database design.

[Drsolly <drsollyp () drsolly com>]

On Tue, 6 Jun 2006 Valdis.Kletnieks () vt edu wrote:

> On Tue, 06 Jun 2006 22:24:33 BST, Drsolly said:
>
> > I checked. The mtbf for these drives (according to Maxtor), is 1.2 million 
> > hours = 137 years.
>
> Odd how many people I know who have had disk drives die on them, if they're
> supposed to live that long.
>
> I surplused 10 Dell GX-110s from a research lab on campus a while ago. That's
> a 6-7 year old box, and of the 10 only 5 had a working drive.  And these
> were *not* abused systems - just a normal office environment.  Assuming even
> a MTBF 1/5s of the 1.2M hours of some 25 years, what's the statistical
> probability of half going dead inside 7 years?
>
> > I suggest you redo your calculation with the correct mtbf of 1.2 million 
> > hours.
>
> You're welcome to do the math yourself. 

I did. It means it's feasible to use these drives.

> Remember IBM DeathStar drives as you do it...
 
That's not the only drive type that's had severe problems. 

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