[dm-crypt] LUKS linux encrypted file system causing file corruption

Arno Wagner arno at wagner.name
Mon Nov 30 15:16:46 CET 2015

Hi Sumit,

There are several possibilities. After you have made sure
that noting is chanmging the source during the copying,
the remaning possibilitiy is data corruption.

The first thing is to get an idea how many bytes are 

  cmp -b file1 file2 | wc 

does that. Please run this (may take long) and post the 

One of the usual suspects in data corruption is RAM. 
You ma want to run a memory-check overnight, just to 
be sure. See FAQ Item 4.3 and 4.4:



On Mon, Nov 30, 2015 at 10:19:34 CET, Sumit Kumar wrote:
> <http://stackoverflow.com/questions/33993264/luks-linux-encrypted-file-system-causing-file-corruption#>
> I am having a LUKS encrypted Linux file system (dmCrypt). When I copy a
> huge file, around 5 GB of file, from un-encrypted linux file system to LUKS
> encrypted linux file system then the target copied file MD5 changed.
> I am not sure does it corrupting the file as the MD5 changed?
> I am using CentOS 6.5 and working on VMs not on physical machine.
> Any help will be greatly appreciated .
> -- 
> Thanks & Regards
> *Sumit Kumar*

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Arno Wagner,     Dr. sc. techn., Dipl. Inform.,    Email: arno at wagner.name
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