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
