CERC Performance Question

[Sturgis, Grant]

Florent Gilain wrote:
> Hi all,
> 
> I have many PE1850 and 2800 with Perc4 raid card with 2 RAID 1 Hard disk,
> here is what i get :
> 
> [root at apache1 usr]# date; dd if=/dev/zero of=big_file bs=1024 count=5120000;
> date
> mer jui 26 15:33:31 CEST 2006
> 5120000+0 enregistrements lus.
> 5120000+0 enregistrements écrits.
> mer jui 26 15:35:59 CEST 2006
> [root at apache1 usr]# date; dd of=/dev/zero if=big_file bs=1024 count=5120000;
> date
> mer jui 26 15:36:41 CEST 2006
> 5120000+0 enregistrements lus.
> 5120000+0 enregistrements écrits.
> mer jui 26 15:38:31 CEST 2006
> 
> This seems very bad performances no ?

not really, doesn't look too bad to me.  Try this:

time mv /one/path/big_file /another/path/big_file


> 
> Florent 
> 
> -----Message d'origine-----
> De : linux-poweredge-bounces at dell.com
> [mailto:linux-poweredge-bounces at dell.com] De la part de Tino Schwarze
> Envoyé : mercredi 26 juillet 2006 15:25
> À : linux-poweredge at dell.com
> Objet : Re: CERC Performance Question
> 
> On Tue, Jul 25, 2006 at 02:51:55PM +0000, ross levins wrote:
> 
>>To remove any issues with NFS and/or network why dont' you just try your 
>>test by writing/reading locally for read and write test
>>dd if=/dev/zero of=big_file bs=1024 count=5120000
>>dd of=/dev/zero if=big_file bs=1024 count=5120000
>>
>>I have seen read/writes upto 80 to 90MB/second with this controller which 
>>also is too slow and in general this controller performs poorly.
>>thanks
> 
> 
> BTW: dd_rescue provides nice avg/current throughput numbers.
> 
> Bye,
> 
> Tino.
> 
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