Hi. I am about to reconfigure a Cluster from Active/Passive to Active/Active. The Current setup contains two SQL Instances. And it is now required to run each instance on a separte server in the cluster. Howerver, I would like to configure the cluster so that if a node fails, then the one remaining node can still run both SQL Instances. The Server nodes are Microsoft Server 2003, running SQL Server 2000 SP4. Windows Server 2003 SP1 could be installed prior to cluster reconfiguration if advisable. The current setup of Active/Passive Clustering is as follows. Cluster Group :- Cluster IP Address Resource Cluster Name Resource Quorum Disk Resource SQL Instance 1 Group :- Dedicated Disk Reources SQL IP Resource SQL Network Name Resource SQL Server Resource SQL Agent Resource SQL FullText Indexing Resource SQL Instance 2 Group :- Dedicated Disk Reources SQL IP Resource SQL Network Name Resource SQL Server Resource SQL Agent Resource SQL FullText Indexing Resource All disk resources are on a SAN server. The Cluster configuration I want to achieve is Active/Active. Each server in the cluster servicing its own SQL Instance. Eg. Node 1 controls SQL Instance 1 Node 2 controls SQL Instance 2 I would also like to achieve a configuration that enable a single node to run both instances if the other node fails. Are there any definitive instructions for converting Active/Passive to Active/Active clustering. Also, there is the question of memory allocation to enable failover. E.g. 20% memory of each server goes to the System. 40% memory is predifined as SQL Instance memory. Therefore if a nodes fails and the SQL Instance is started up on the remaining node there is 40% memory available to run in. If anyone has any applicable information or guidlines I would be very gratefull. Thankyou to anyone who responds.