On 24 Aug 2005 02:08:46 -0700, orgone said something similar to:
: I recently rsync'd around 2.8TB between a RHE server (jfs fs) and a
: Netapps system. Did a 'du -sk' against each to verify the transfers:
:
: 2894932960 sources total, KB
: 2751664496 destination total, KB
:
: That's a 140GB discrepancy. Subsequent verbose rsyncs have turned up
: nothing that was not originally transferred.

What are the native block sizes of the two filesystems? If you've got
a large enough number of files and directories there, a smaller block size
on the destination could account for the discrepancy in terms of less unused
space at the end of the last block of each file.

Another thing that I've seen cause discrepancies like this on occasion is
when the source directories once had many more files in them then they
currently do. Once more blocks have been allocated to a directory, they
don't get deallocated when the number of files drops.