Re: Bad fibre channel performance: need howto

[Fabien Salvi <fabien@cri74.org>]

Mario Giammarco a écrit:
> Il lun, 2003-11-24 alle 11:55, Fabien Salvi ha scritto:
> 
> 
>>Hello Mario,
>>
> 
> 
> 
>>If you want, I can send you an archive of the howto.
>>I've downloaded it a long time ago, before sistina removed it from their 
>>server.
>>
>>But, it's true, it's a bit old
> 
> 
> Yes send it to me please. I like to read all.

Here :
ftp://ftp.cri74.org/incoming/services/3c6caf61efc733e03526edac45852ad1/fibrechannel_howto.tar.bz2

>>About your problem, I am not sure it's really because of FibreChannel.
>>There are a lot of differences between theorical values and real ones.
>>Which tool are you using for the benchmark ?
> 
> 
> I know but usually the "sequential read" is the easiest test to discover
> if there are problems.
> 
> I have used hdparm and sg3 tools to do a quick sequential read test.
> On ide world if hdparm tells me that I have  sequential transfer rate
> lower than shown on web reviews it means that I have to tweak dma, etc.
> and usually after tweaking I get performance promised.
> 
> Here there is little to tweak and I then discovered with a serious test
> (tiobench) that write performance is also worse.
> 
> I suppose there is some problem.
> 
> I am now buying a qlogic2200 to try if it is better.
> Can someone tell me best drivers for qlogic2200?

I use qlogic 2200 FC HBA with the official qlogic driver and it works 
fine. Look at: 
http://www.qlogic.com/support/os_detail.asp?productid=113&osid=26

-- 
Fabien SALVI      Centre de Ressources Informatiques
                   Archamps, France -- http://www.cri74.org
                   PingOO GNU/linux distribution : http://www.pingoo.org

-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html