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There's only one way to find out. Let SABnzbd download the same NZB once to the single drive and once to the RAID, without any post-processing . Then compare the files on the byte level. If there are differences, then  it's something in the OS, Python or SABnzbd. If the files are identical, bit man...

Hi, Sorry for the late reply, sometimes have to do other stuff... ;D Off course the unrar reports the crc errors. But it only reports crc errors when I download to the raid array. If I download THE SAME nzb file to the single harddrive, no crc errors occur and most of the time no repair has been nec...

Most testing is done on Python 2.6.x where X is the latest supported by Ubuntu and ActiveState (for Windows). That's the one installed in my distro.... As an extra test you could try to run a large par2 repair followed by an urar, from the command line, without SABnzbd. par2 and unrar are notorious...

OK. Thanks for all your replies.
On the seaparte disk it works now, but I don't like the idea of possibly having an unstable raid-array (nerver noticed it though......)
I will try to change python-versions tonight, to see if THAT brings anything. Which version of python do you recommend?

shypike wrote:
I wouldn't know where to begin looking for such an issue.

I hear you.... I will try and check my logfile tonight, to see if I can find any indication. Maybe this thread helps?

http://forums.sabnzbd.org/index.php?topic=4150.0

RAID systems are handled 100% by the operating system. It's not like applications need to do something special to support them. I'd sooner doubt the OS and/or the disk array. Yeah, that was off course my first impression too.  I did very many extensive disk tests with the raid array, and it passed ...

Well, after days of research I can add a new cause of crc errors! For some reason either sabnzbd or python can't deal properly with raid 5 arrays on Linux. I tried at least 10 different downloads and all failed because of crc errors. Then I downloaded the same  again on a Windows system, wihout erro...