Re: RAID Reliability Calculations
- From: "Joel Garry" <joelgarry@xxxxxxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 7 Jan 2005 10:19:52 -0800
chris@xxxxxxxxxxxxxxxxxxxxx wrote:
> 10 TB of data, 72 GB drives with 1,400,000 hrs MTTF
First, thanks for doing this, I think such exercises are useful and
informative.
But just a small MTTF rant:
I think the manufacturers' MTTF figures are statistically abused. I
think they throw out some failures that happen, and have unrealistic
physical testing environments compared to the real world.
By the calculations, I should maybe have seen one multiple disk failure
in my career, yet I sometimes see several per year.
If anyone can shed some light on these notions, feel free.
Joel Garry
http://www.garry.to
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