Brian, Multiple Oracle Clusterware are not allowed on single machine. Clusterware software has to be >= the latest version of database/asm instances its managing. Though you can manage older databaese/asm instance with later version of Oracle clusterware. Regards, Vishal Gupta http://www.vishalgupta.com ________________________________ From: oracle-l-bounce@xxxxxxxxxxxxx on behalf of Brian Sent: Mon 16/11/2009 16:08 To: oracle-l@xxxxxxxxxxxxx Subject: 10g and 11g clusterware on same nodes Hi all, Has anyone ever deployed both 10g and 11g clusterware on the same nodes using a different Linux owner/account for each? The clusterware would share the same interconnect but use different VIPs on the same bonded NICs. The clusterware would not manage nor use the same shared storage. Thanks, Brian