Michael, Orion has a loadbalancer for the web-tier, and this has failure detection, and is http session aware. If your application is deployed on several island's, your web-tier is virutally immortal. Likewise, entity beans and slsb ejb's deployed in the same vm's will be replicated.
For beans which are deployed on remote machines, the Orion ormi has a built-in failover capability. If you provide a list of ormi servers in your rmi.xml file, Orion will try each one, in turn, if one is unavailable. So entity and slsb's have complete fail-over. However, most who use orion use ejb's in the same container as the web teir. Ormi can also be clustered using multi-casting. Oc4j has sfsb fail-over, as I have seen this demonstrated at Oracle Open World by Larry himself. I am still checking if this will work in 1.5.4. Key bit is the replication tag in the orion-ejb-jar.xml. Apparently, it only works for the default state. Oracle describes three different methods, vm shutdown replication, end of call replication and a homegrown method call replication. The EndOfCall replication attribute just blows up nicely, so it looks like they have broken this for orion 1.5.4. Still investigating, though. regards, the elephantwalker www.elephantwalker.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Michael Crozier Sent: Thursday, March 21, 2002 2:07 PM To: Orion-Interest Subject: EJB failover/replication? Hello, I'm starting to evaluate Orion as a application server for a project and I'm trying to figure out if/how Orion supports EJB failover. Oracle/AS appears to, but I can't tell if thats a feature that they added on top of Orion. If EJB failover/replication is supported, could somebody point me to any documentation? Thanks, Michael
