CentOS - Jul 2011 - Upgrade from CentOS 5.x to 6.0

Great news about CentOS 6.0 being available, and I figured I'd ask the most
obvious question, what can I expect when upgrading from CentOS 5.6 to 6.0?
 I have not had to go from one major version of CentOS to another so this is
new territory for me.  Is the processes just like an install except there's
an "Upgrade" option?  Does an upgrade do a "yum update" of
everything
installed?  Most of my systems use EPEL and some the IUS repos...is there a
way during the upgrade to just upgrade system components and leave things
like PHP, httpd and MySQL alone for now?  Any suggestions on monitoring the
upgrade progress via syslog or some other method so I can see exactly what
is being done during the upgrade?

Thanks
- Trey
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Trey Dockendorf wrote:
> Great news about CentOS 6.0 being available, and I figured I'd ask the 
> most obvious question, what can I expect when upgrading from CentOS 5.6 
> to 6.0?  I have not had to go from one major version of CentOS to 
> another so this is new territory for me.  Is the processes just like an 
> install except there's an "Upgrade" option?  Does an upgrade
do a "yum
> update" of everything installed?  Most of my systems use EPEL and some
> the IUS repos...is there a way during the upgrade to just upgrade system 
> components and leave things like PHP, httpd and MySQL alone for now? 
>  Any suggestions on monitoring the upgrade progress via syslog or some 
> other method so I can see exactly what is being done during the upgrade?
> 
> Thanks
> - Trey
Direct upgrade is NOT supported. You are advised to backup your old 
system, save all relevant parameters and personal data and do a clean 
install.

I think CentOS 6.0 by default uses etx4 partitions that are better then 
old ext3, so I would advise total reformat of root partition (*after* 
backup) and fresh install on newly formated partition.

Ljubomir