CERC Performance Question

[Florent Gilain]

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 ?

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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