2010/1/19 Rick Thomas <rbtho...@pobox.com>: > > On Jan 18, 2010, at 12:20 PM, Leonardo Canducci wrote: > >> I'm using rsync -aHS to backup some stuff (mostly jpgs and docs from >> my home) to an external usb hard drive (same ext3 fs). >> After a backup I ran du -s to get a fast check on size and found >> source and target to be slightly different. >> Even using du -cb or du-cbk size doesn't match. So what's wrong?! >> >> I've noticed some dir size doesn't match: >> l...@zazzero:~$ ls -ld /media/toshiba-docs/foto/d50/ >> drwxr-xr-x 43 leo leo 4096 6 gen 11:17 /media/toshiba-docs/foto/d50/ >> l...@zazzero:~$ ls -ld /share/foto/d50/ >> drwxr-xr-x 43 leo leo 69632 6 gen 11:17 /share/foto/d50/ >> >> I'd like the size of the backup to be exactly the same and check sync >> result with du. >> >> BTW, is there some better fast check I could do to test rsync behavior? >> >> Thanks! >> -- >> Leonardo Canducci > > Probably you have directories that have grown and shrunk on the source > filesystem. They will still have the space allocated (just the actual > directory -- not the files in it) for the file-name entries that were > deleted. When you transfer them to the target (in this case the USB hard > drive), the directories are rebuilt from scratch, so they don't have space > allocated for the deleted file-names.
That's it! > > If you want to use file sizes as a check on the operation of rsync (not the > best check, but it will catch some kinds of errors) you could do something > like this > > ( cd source ; find . -type f -print0 | sort -z | xargs ls -s ) > > /tmp/source-stuff > ( cd target ; find . -type f -print0 | sort -z | xargs ls -s ) > > /tmp/target-stuff > diff /tmp/target-stuff /tmp/source-stuff > > you can use something like "md5sum" in place of "ls -s" if you want a more > industrial strength check... how does that compare to rsync -cn? Is it faster? safer? Thanks! -- Leonardo Canducci -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
