Thanks for this input. I'll do a RAM check tomorrow. :-) On Dec 9, 2010, at 1:13 PM, Sherwin Daganato wrote:
> 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 > _________________________________________________ > Philippine Linux Users' Group (PLUG) Mailing List > http://lists.linux.org.ph/mailman/listinfo/plug > Searchable Archives: http://archives.free.net.ph _________________________________________________ Philippine Linux Users' Group (PLUG) Mailing List http://lists.linux.org.ph/mailman/listinfo/plug Searchable Archives: http://archives.free.net.ph
