backup space issue after migration to 6.0.2

[maumar]

I have following issue by the time i migrated from 5.0.18 to 6.0.2.
The /opt/zimbra/backup is an nfs mount.
This a CentOS release 5.3 (Final), 2.6.18-128.el5

root@zimbra ~ ]# df -h
Filesystem         Dimens. Usati Disp. Uso% Montato su
/dev/sda2             4,8G  2,2G  2,4G  49% /
/dev/sdb1             126G  100G   21G  84% /opt
/dev/sda1              99M   12M   83M  12% /boot
tmpfs                 1,5G     0  1,5G   0% /dev/shm
192.168.x.x:/opt     276G  191G   72G  73% /opt/zimbra/backup


ls -lat /opt/zimbra/backup/sessions/
totale 52
drwxr-x--- 13 zimbra zimbra 4096  6 gen 01:09 .
drwxr-x---  6 zimbra zimbra 4096  6 gen 01:09 incr-20100106.000008.356
drwxr-xr-x  5 zimbra zimbra 4096  6 gen 00:09 ..
drwxr-x---  6 zimbra zimbra 4096  5 gen 01:09 incr-20100105.000009.055
drwxr-x---  6 zimbra zimbra 4096  4 gen 01:08 incr-20100104.000009.033
drwxr-x---  6 zimbra zimbra 4096  3 gen 01:08 incr-20100103.000009.053
drwxr-x---  6 zimbra zimbra 4096  2 gen 06:06 full-20100102.000007.799
drwxr-x---  6 zimbra zimbra 4096  1 gen 01:07 incr-20100101.000008.356
drwxr-x---  6 zimbra zimbra 4096 31 dic 01:06 incr-20091231.000007.888
drwxr-x---  6 zimbra zimbra 4096 30 dic 01:06 incr-20091230.000007.133
drwxr-x---  6 zimbra zimbra 4096 29 dic 01:06 incr-20091229.000008.390
drwxr-x---  6 zimbra zimbra 4096 28 dic 01:05 incr-20091228.000009.470
drwxr-x---  6 zimbra zimbra 4096 27 dic 05:39 full-20091227.000008.592

 du -s -h /opt/zimbra/store/
94G     /opt/zimbra/store/

Store does take 94 G, backup is 191G, with 2 full backup.

Each full backup takes the same space, hard linking seems not working at all so.

As far as I can remember, with 5.0.18 I have never ever had such issues. Am I wrong?
What I am missing?

[Klug]

Read the release notes.

And search the forum, there are several threads about this.