Ocfs2 users - Mar 2013 - what is ocfs 1.8 new features, not working for old ocfs 1.6 filesystems

Hi, 

i upgraded an OEL5.4 to OEL 5.9, this machine has an OCFS Filesystem with an
OEL6.2 upgraded to OEL6.4.
There i got OCFS1.8 but i don't see any news on 
https://oss.oracle.com/projects/ocfs2/ 
no release notes, what have changed and so on. 
OCFS 1.6 is the last version. 

Also after upgrading the o2cb Cluster was unable to come online. 
So i blocked OEL6 to upgrade ocfs and reinstalled "old" 1.6 RPMs for
OEL5.

so my questions are: 
1. what are the differences of OCFS 1.8 over 1.6? 
2. are there any modifications (additional to activating xattr on OCFS1.6) to
get the cluster with 1.8 running?

best regards 
thomas 



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