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The Question is: I have two ethernet cards configured on a dual 8400 cluster and I'm trying to determine the load on the two cards. I would like to ensure that cluster communication is restricted to one card and all other external communication uses the other card. I started by running show cluster/continuous and added classes connections and credits. This display indicates two transports that I would like to know more about: SCA$TRANSPORT & VMS$VAXcluster. I presume VMS$VAXcluster is the cluster communication but I can't find anything about SCA$TRANSPORT. Can you tell me more about these or point me in the right direction? Thanks, The Answer is : Traditional Ethernet likely lacks sufficient bandwidth for this particular configuration. The use of Fast Ethernet or (better) Gigabit Ethernet would be prefered, probably also with multihost SCSI buses and/or Fibre Channel controller(s) present. An OpenVMS Cluster will detect and use all available appropriate paths. As a general rule, an OpenVMS Cluster configuration can and should use all buses until proven otherwise. If you wish to disable a particular bus, see SYS$EXAMPLES:LAVC$STOP_BUS.*. VMS$VAXcluster is the Cluster SYSAP for the connection manager, for the distributed portion of the lock manager, and similar. SCA$TRANSPORT is the SYSAP associated with the interprocess communications (IPC) transport. Things like JOB_CONTROL and the QUEUE_MANAGER, and the DDTM distributed transaction manager use IPC. Starting with V7.2, you can potentially see multiple SCA$TRANSPORT SYSAPs operating on a node.
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