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