[CentOS] Benchmark Disk IO

[przemolicc at poczta.fm]

On Wed, May 05, 2010 at 09:47:19AM -0700, nate wrote:
> Matt Keating wrote:
> > What is the best way to benchmark disk IO?
> >
> > I'm looking to move one of my servers, which is rather IO intense. But
> > not without first benchmarking the current and new disk array, To make
> > sure this isn't a full waste of time.
> 
> You can do a pretty easy calculation based on the #/type of drives
> to determine the approx number of raw IOPS that are available, since
> it's I/O intensive your probably best off with RAID 1+0, which further
> simplifies the calculation, parity based raid can make it really
> complicated.
> 
> 7200 RPM disk = ~90 IOPS
> 10000 RPM disk = ~150-180 IOPS
> 15000 RPM disk = ~230-250 IOPS
> ...

The above numbers are true if we have random (!) IO pattern.
In case of sequential (!) IO even SATA disks can deliver much, much higher numbers.


Regards
Przemyslaw Bak (przemol)
--
http://przemol.blogspot.com/





























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