Multiple WL instances on same machine with multiple clusters

Hi,
          I am wondering if it is possible to run two separate instances of WL on a
          single machine, with each instance belonging to a separate cluster? The
          machines are not multi-homed, so each instance must listen on a separate
          port.
          Our current architecture looks like this:
          4 web servers running NSAPI WL plug-in
          3 app. server boxes running WL 5.1 SP2
          I would like to start multiple instances of WL on each app. server to better
          utilize the hardware, and would like each instance to be part of a separate
          cluster.
          My questions are:
          1. Do I have to have a separate multicast address for each cluster, or can
          I use the same address since the clusters are on different ports?
          2. In the NSAPI plug-in, you simple specify a list of all the servers for a
          cluster. Are there any issues with having the machine/port names in this
          list belonging to different clusters?
          Thanks,
          Bob

Comments inline.
          Cheers - Wei
          www4.weblogic.com <[email protected]> wrote in message
          news:[email protected]...
          > Hi,
          >
          > I am wondering if it is possible to run two separate instances of WL on a
          > single machine, with each instance belonging to a separate cluster? The
          > machines are not multi-homed, so each instance must listen on a separate
          > port.
          Yes, you can. FYI, in addition, each cluster use different multicast
          address.
          >
          > Our current architecture looks like this:
          >
          > 4 web servers running NSAPI WL plug-in
          > 3 app. server boxes running WL 5.1 SP2
          >
          > I would like to start multiple instances of WL on each app. server to
          better
          > utilize the hardware, and would like each instance to be part of a
          separate
          > cluster.
          >
          > My questions are:
          >
          > 1. Do I have to have a separate multicast address for each cluster, or
          can
          > I use the same address since the clusters are on different ports?
          Different multicast addresses.
          >
          > 2. In the NSAPI plug-in, you simple specify a list of all the servers for
          a
          > cluster. Are there any issues with having the machine/port names in this
          > list belonging to different clusters?
          In-memory replication will not work.
          >
          > Thanks,
          > Bob
          >
          >
          >

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