Best driver for qlogic 2200 fc?

Best driver for qlogic 2200 fc?

[Mario Giammarco]

Hello,
I have a lsi logic fusion mpt controller which is well supported under linux 
kernel.

Unfortunately it gives me slow performance (sequential read of 30mb/sec on a 
seagate 318452fc that can do 60mb/sec sequential read).

I would like to try qlogic 2200 hba, but I need a driver for linux that:

1) compiles statically on the kernel
2) works with scsi hard disks and as tcp/ip (fc0)

Can you give me some suggestions?

Thanks in advance.

-- 
Mario Giammarco

Re: Best driver for qlogic 2200 fc?

[Mario Giammarco]

Il lun, 2003-11-17 alle 17:06, Craig Tierney ha scritto:

> > Unfortunately it gives me slow performance (sequential read of 30mb/sec on a 
> > seagate 318452fc that can do 60mb/sec sequential read).
> > 
> 
> What is your write performance?  Have you tried
> to tune /proc/sys/vm/{min,max}-readahead?

I have tuned readahead and not it goes 50 mb.
I am shocked, why I need to tune it?
Usually I do an hdparm -t -T to see if hard disk is good
(and eventually hdparm again to tune ide interface)
Without tuning I can reach sequential read of more than 60 mb using raid0.
I do not understand why the OS cannot use the full speed of this FC drive.

OTOH side I discovered that (in a raid1 array ) the two seagate write speed is very low: 10mb/s, why?