Re: Bad fibre channel performance: need howto

[Fabien Salvi <fabien@cri74.org>]

Mario Giammarco a écrit:
> Hello,
> I asked a similar question last week.
> I discovered that my hard disk which can do 60mb/sec sequential read,
> under linux/lsilogic40909 fibre hba gives only 30mb/sec, 45 if I tweak a
> lot readahead (why  I need to?).
> 
> I have searched a lot in internet and it seems that:
> 
> 1) fibrechannel howto was in sistina home page but now disappeared
> 2) fibrechannel specific mailing list for linux disappeared (archives
> to)
> 
> Where can I search for help? 
> Here it not seems appropriate to me. 
> 
> I have to find my bottleneck, please help with sending me docs.
> 

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. Therefore, there are some basic 
informations about protocol that could have some interest.

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 ?


-- 
Fabien SALVI

-
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