Brian, I reran the tests with PL and READ_COMMITTED isolation level. anonymous wrote : | | | jboss:service=Naming | jboss:service=TransactionManager | | org.jboss.cache.JBossTransactionManagerLookup | | PESSIMISTIC | READ_COMMITTED | REPL_SYNC | The result is definitely better and at par with what I was getting with OL. However, problem with scalability with {4,5} node cluster still exists. I get almost linear scalability in {1,2,3} node cluster but load handled in {4,5} node cluster is more or less same as that of a 2-node cluster. I have not tested with more than 5 node cluster to see if pattern continues. Also, I am not sure based on this test if I should relax the isolation level from REPEATABLE_READ to READ_COMMITTED. Currently, RR is default isolation level in portal. Thoughts on this? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4165421#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...