Cp -R Command - Different number of Bytes in Original dir and copied dir

Question

Hi Experts,
I have copied an Directory (49GB) using *cp -R +<Original file path> <new place>+* command.
When i run du -c | grep total cammand in both original file and the copied filr below are the values,
Original - 50998896
Copied - 50999684
Why it gives different values ??
Do i need to use any other command to copy it ??
Will it be a issue on taking backups ???
Please help me ......

Answer 1

Dude wrote:
It works fine here, see below example:
<pre>
# mkfs.ext4 /dev/sdb3
# mkdir /mnt/sdb3
# mount /dev/sdb3 /mnt/sdb3
# cd /lib64
# tar -cf - . | (cd /mnt/sdb3; tar -xf -; sync)
# du -s /lib64
27072     /lib64
# du -s /mnt/sdb3
27088     /mnt/sdb3
# du -s /mnt/sdb3/lost+found
16     /mnt/sdb3/lost+found
</pre>
Do you have any hidden files on /extra/sdb6? Are you using the same filesystem? You can try the diff command to see what is different, e.g.:
<pre>
# diff /lib64 /mnt/sdb3
Only in /mnt/sdb3: lost+found
</pre>
You can also use the cp copy command, but you will have to add some options to preserve file ownerships, timestamps, links, etc, e.g.:
<pre>
# rm -rf /mnt/sdb3/lib64
# cp -pdr /lib64 /mnt/sdb3
# sync
# du -s /lib64
27072     /lib64
# du -s /mnt/sdb3/lib64
27072     /mnt/sdb3/lib64
</pre>
Edited by: Dude on Dec 3, 2012 2:12 PMThis is what I got, still doing my investigation:
[root@oracle-32 usr]# du -s /mnt/home/oracle/
166996     /mnt/home/oracle/
[root@oracle-32 usr]# du -s /extra/sdb6/home/oracle/
175152     /extra/sdb6/home/oracle/
[root@oracle-32 usr]# diff -r /mnt/home/oracle/ /extra/sdb6/home/oracle/
Only in /mnt/home/oracle/.dropbox: command_socket
Only in /mnt/home/oracle/.dropbox: iface_socket
diff: /mnt/home/oracle/.pulse/5325b55a5d3c35d27a2aecaa00000021-runtime: No such file or directory
diff: /extra/sdb6/home/oracle/.pulse/5325b55a5d3c35d27a2aecaa00000021-runtime: No such file or directory