As we cant do clustering/HA from confluence 5.6 (without Datasource License), i would like to know whether are there any options apart from DataSource license for clustering of confluence or atleast Tomcat load balancing (can we have two tomcats servers pointing to one Confluence instance).
No. You need Data Centre to do that.
You'll corrupt your Confluence database if you try to run two installations against it without Data Centre (Actually, you won't - the second one you start will shut itself down before there's any damage. But if you hacked that protection out, you will corrupt it)
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