On Thu, Dec 9, 2010 at 6:00 AM, Michael Janapin
<[email protected]> wrote:
> I am experiencing a very weird behavior on my Ubuntu 10.04 box (with ext4 as
> fs of my /).
> I have several large iso files (3GB or more) and whenever I md5sum them, it
> turns out different everytime. !?
> I also experienced that when I copy/move a large file, it turns out with a
> different md5sum in its new location.
> Also when I scp/wget/ftp those files over the network, the md5 changes again.
>
> This only happens with large files. The smaller ones have no problem.
> Could it be with my file system? Or could it be something else?
Mhac, check the RAM first. I've also had this problem with reiserfs a
long time ago. IIRC, it was due to bad RAM.
This page
http://superuser.com/questions/206526/memory-cache-losing-sync-with-disk
describes how someone with the same problem as you're having nailed it down.
Apparently not all memory problems can be detected by memtest86+.
Also, according to
http://linux.m2osw.com/memory-test-on-live-system
http://www.cyberciti.biz/tips/howto-linux-server-memory-check.html
dd and md5sum can be used to test for defective RAM.
HTH
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