Personally I'd just use srvctl - probably makes it much easier to "relocate" instances. In fact 11gR2 will do this for you automatically. For those who haven't had a chance to look closely yet, RAC has some major new features. One of them (policy-based cluster mgmt) will automatically re-allocate a node between two cluster DBs by shutting down and starting up instances - driven by response times - and of course within limits that you set. Look for "server pools" in the docs. Pretty interesting-looking new feature; I think it's one of the most significant of the release. :) -Jeremy LS Cheng wrote: > Hi all > > > We are running a 4 nodes RAC on Sun Solaris 10, each node with 16 > quadcore CPU and 512GB memory. There are 12 database in this Cluster. > > We have observed that some instances are running with low activity and > some needs more horsepower when batch processes kick in. Basically in > some nodes we are wasting resources which can be used for other instances. > > The way we have configured the databases are setting same SGA in all > nodes so in those idle instances memory is wasted. > > We are considering reorganize the memory distributions and > databases/instances distribution. For example for database APP1 just > configure two active instances and two passive, for the heavy OLTP > system all 4 nodes etc. > > I have been considering disabling the instance startup for the passive > nodes. What is the the better method, reconfigure the database in two > nodes only by using dbca or disabling the instance startup? (srvctl > disable instance) > > > > > TIA > > -- > LSC > -- Jeremy Schneider Chicago, IL http://www.ardentperf.com -- //www.freelists.org/webpage/oracle-l