Tuning scst windows and sw raid5

Hi,

I'm trying to tune Software Raid5, SCST and Windows Initiator to get best
read/write performance.

On debian based system I created raid5 from 3 disks. I added it to scst config
in BLOCK IO mode. Then I made some performance tests with Linux and Windows
initiators. On Linux I used xfs filesystem and ntfs on Windows.

Here are test results:
https://spreadsheets6.google.com/spreadsheet/pub?hl=pl&hl=pl &key=0AghOYEb75PA2dGU1WUdKTl9hNDFDc3ZBdkRQeEFrR3c&output=htm l

What we can see there is that on Linux results are quite consistent. Windows
results are more interesting. It looks like to get better performance NTFS
block size should be bigger than raid chunk size. Why it only matters on
Windows? But even then Windows performance is worse than on Linux.

If in SCST I am using FILEIO mode or instead of RAID5 RAID0 then performance
on both systems is comparable.

Did anyone have same results and Do you have any tips how to improve
performance on Windows?

Software details:
iSCSI target: Debian etch
Windows:
Windows Server R2
test program: BST5 (http://www.nu2.nu/bst/_
Linux:
Debian 6.0
test program: dd

I'm not sure what is the main cause of problem so I'm sending this mail to
SCST maillist and to linux-raid maillist.

Regards,

--
Lukasz Oles
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