I second that. I have some experience with handling large data-sets. Doing a verify after copying larger amounts of data is one of the better ways to identiify problems with RAM, busses and controllers. Regards, Arno On Wed, Dec 02, 2015 at 09:04:10 CET, Ritesh Raj Sarraf wrote: > Did you get a chance to verify what Ralf and Arno asked for ? > > I'd too, be interested to know the findings. In the initial post, you > did not mention what file system you were on ? > > Also, interesting is Ralf's point. Are you copying the file while it is > opened by another process ? > > > Ritesh > > > On Mon, 2015-11-30 at 13:47 +0100, Ralf Ramsauer wrote: > > Hi Sumit, > > > > a change of the checksum implies that the source and destination file > > differ. The reason why it differs is another question. > > Does the checksum also differ if you copy it from unencrypted to > > unencrypted? > > > > First, please check your dmesg log if something suspicious occurs > > during the copy process. A hard drive failure might also explain your > > problem. As you're using VMs, check the dmesg of the hypervisor > > machine which accesses the actual hardware. > > > > Second, ensure that the source file is not changed during the copy > > process and also not afterwards when comparing the checksums. Same > > applies to the destination. You might want to use 'lsof' to check if > > some process is accessing the file. > > > > Just a guess - ...you mentioned VMs and a file of around 5GB... > > Sounds like you're trying to copy a VM image, eh? > > If so, make sure that your virtualization software does not touch the > > file during copy. > > > > Cheers > > Ralf > > > > On 11/30/2015 10:19 AM, Sumit Kumar wrote: > > > 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 > > > > > > > > > _______________________________________________ > > > dm-crypt mailing list > > > dm-crypt@xxxxxxxx > > > http://www.saout.de/mailman/listinfo/dm-crypt > > _______________________________________________ > > dm-crypt mailing list > > dm-crypt@xxxxxxxx > > http://www.saout.de/mailman/listinfo/dm-crypt > -- > Given the large number of mailing lists I follow, I request you to CC > me in replies for quicker response > > _______________________________________________ > dm-crypt mailing list > dm-crypt@xxxxxxxx > http://www.saout.de/mailman/listinfo/dm-crypt -- Arno Wagner, Dr. sc. techn., Dipl. Inform., Email: arno@xxxxxxxxxxx GnuPG: ID: CB5D9718 FP: 12D6 C03B 1B30 33BB 13CF B774 E35C 5FA1 CB5D 9718 ---- A good decision is based on knowledge and not on numbers. -- Plato If it's in the news, don't worry about it. The very definition of "news" is "something that hardly ever happens." -- Bruce Schneier _______________________________________________ dm-crypt mailing list dm-crypt@xxxxxxxx http://www.saout.de/mailman/listinfo/dm-crypt
