Slow CCISS ( not bug 13127 )

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Hello list
I got a refurbished  HP DL360   server with CCISS controller.
SCSI I/O is really slow with *old* kernels like 2.6.26/27/28.

I have 2 new 147gb disks , controller is set to  raid0 configuration 
hdparm -t /dev/cciss/c0d0 gives me ~27.0 MB/s which is very poor.

I tried  gentoo/ubuntu/debian/centos and all gives the same result.
There is an open bug about regression of newer kernels and this controller 
however I'm  having poor results with old kernels as well.
http://bugzilla.kernel.org/show_bug.cgi?id=13127
I'll appreciate your help.
Thanks.
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