[sclug] disk transfer rates (was) Newbie, partitioning 120Gb HDD - recommendations?

Matt matt at bodgit-n-scarper.com
Wed Jan 19 12:13:31 UTC 2005

* Tom Dawes-Gamble <tmdg at tmdg.co.uk> [2005-01-19 12:03:39]:
> On Wed, 2005-01-19 at 10:09 +0000, Dickon Hood wrote:
> > On Wed, Jan 19, 2005 at 07:52:42 +0000, Tom Dawes-Gamble wrote:
> > 
> > [...]
> > 
> > : So I've knocked together a very rough benchmark. How long so it take to
> > : read a gigabyte from the disk.  I did each test several times and these
> > : are typical results.
> > 
> > Try hdparm -T and -t; they're more accurate than any number of runs of dd,
> > as it bypasses the OS caches.
> More accurate for what?
> Personally I like using dd to measure I/O.  It's a nice userland
> programme.  Almost all the stuff I do is run in userland.  If the OS
> caches data and reads ahead such that I don't notice any difference or
> the difference is reduced.  Then I say "Well done!  Thank you".

bonnie is meant to be a fairly well-regarded disk benchmark, I'm
also suspicious of hdparm as a valid benchmark.

"I never deal with the common man. The common man has no spirituality.
The common man thinks that Ganesha is Dennis the Menace's dog."
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