Re: Database design.

[Valdis.Kletnieks () vt edu]

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.  Remember IBM DeathStar drives as
you do it...

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