We want to implement high availability (via hardware clustering) for our SAP Production Database server.
The server is Sun-Solaris with Oracle database.
The server is shared: ECC5.0 ERP Database and SRM4.0 Database
The central instance for ERP and SRM each run on a separate Windows server. We would like to move the CI's to the Database server, to further reduce single point of failure and reduce problems of heterogenous landscape.
ERP and SRM have been live for over a year.
Documentation appears to indicate that clustering must set up as a step during the SAP installation. Is there any way to configure Sun clustering without reinstalling SAP, or do we have no choice?
In consideration of other high availability options, we are toying with the concept of "Oracle Hot Standby". Can anyone comment if this would be a viable alternative to hardware clustering? With limited resources, we are looking for the best option, cost-wise and time-wise.