[Beowulf] Re: Cooling vs HW replacement
Robert G. Brown
rgb at phy.duke.edu
Fri Jan 21 12:10:31 PST 2005
On Fri, 21 Jan 2005, David Mathog wrote:
> > 2. higher reliability - typically 1.2-1.4M hours, and usually
> > specified under higher load. this is a very fuzzy area, since
> > commodity disks often quote 1Mhr under "lower" load.
> Exactly. It's very, very hard to figure out just how much reliability
> one is trading for the lower price. Anecdotally, for heavy disk
> usage, it's apparently a lot. Anecdotally, for low disk usuage,
> ATA disks aren't all that reliable either.
Has anyone observed that a megahour is 114 years? Has anyone observed
that this is so ludicrous a figure as to be totally meaningless? Show
me a single disk on the planet that will run, under load, for a mere two
decades and I'll bow down before it and start sacrificing chickens.
Humans don't live a megahour MTBF. Disks damn sure don't.
Robert G. Brown http://www.phy.duke.edu/~rgb/
Duke University Dept. of Physics, Box 90305
Durham, N.C. 27708-0305
Phone: 1-919-660-2567 Fax: 919-660-2525 email:rgb at phy.duke.edu
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