Disk Based replication and automated site takeover solution

[aix tiger]

Guys
 
I was in a situation to find out an automated site recovery solution for red hat enterprise Linux and simply disappointed with the fact that for any unknown reaosn , Red Hat Linux dont have any known solution for disk based replication on TCPIP.
 
On the other hand , Suse Enterprise Linux is still using DRBD/HA combination to give such kind of solution known as Suse Enterprise Linux high availaibility extension 
 
Now my question is that how i can build similar solution for red hat ( especially on IBM POWER)....I know on intel , we can do using SRM from Vmware , but this capability is coming from VMWARE not from red hat itself?
 
Can GFS be used for this purpose ? any ideas?
 
Any webslink, experience and doc are highly appreciable!!

Regards