ciss(4): speed degradation for Compaq Smart Array [edited]
Andre Guibert de Bruet
andy at siliconlandmark.com
Wed Mar 30 10:06:42 PST 2005
On Wed, 30 Mar 2005, Doug White wrote:
> On Wed, 30 Mar 2005, Andrey Koklin wrote:
>
>> Firstly, I'm thankful to people who had found time to answer my previous
>> messed post privately. Indeed, I hadn't put there key information about
>> my system configuration, as well as the tests themselves say little or
>> nothing on real disk system performance (they used 1K blocks and didn't
>> take into consideration disks geometry).
>
> You've still omitted the array setup, including RAID type and stripe size.
>
> I'd also suggest using a tool like iozone to run your tests instead of dd.
> Unless your workload consists of entirely sequential writes this perf test
> is worthless.
Even bonnie++ (Which benchmarks far more than just the underlying storage
subsystem) would have been a better benchmark.
An excellent series of DOs and DONTs messages were exchanged last year in
January. An overview of the thread can be found at:
http://blog.delphij.net/archives/000047.html
Happy benchmarking! :-)
Andy
| Andre Guibert de Bruet | Enterprise Software Consultant >
| Silicon Landmark, LLC. | http://siliconlandmark.com/ >
More information about the freebsd-current
mailing list