: I'm not sure which solution works best: having multiple Solr instances : running on the same server, each one for a different website OR having just : one Solr instance running and having each one of the sites share the same : "index"? They're different sites by the way.
if you've got completely independent data sets, and no need to ever involve data from both sets in a single request, then i relaly can't think of many compelling reasons to put both data sets in a single index. you might also be interested in this thread on some tradeoffs of running multiple solr instances in a single servlet container vs seperate servlet containers on the same machine... http://www.nabble.com/Multiple-indexes-tf2929357.html#a8223941 -Hoss
