SCACP

 
   The SCA Control Program (SCACP) utility is designed to monitor
   and manage cluster communications. It is derived from the
   Systems Communications Architecture (SCA), which defines the
   communications mechanisms that allow nodes in an OpenVMS Cluster
   system to cooperate.

   SCA does the following:

   o  Governs the sharing of data between resources at the nodes

   o  Binds together System Applications (SYSAPs) that run on
      different Alpha and VAX computers

   Historically, LAN cluster port information has been available
   only in the System Dump Analyzer (SDA) utility and by using
   the Availability Manager management tool. The ability to
   start and stop PEdriver on a LAN device was provided by
   SYS$EXAMPLES:SYS$LAVC_START_BUS.EXE and SYS$LAVC_STOP_BUS.EXE.
   No way existed to prioritize use of LAN devices or individual
   channels.

   SCACP provides an alternative method of collecting cluster
   management data and exercising management control over cluster
   communications. OpenVMS Version 7.3 introduced SCACP's ability to
   manage SCA use of LAN paths. Beginning with OpenVMS Version 7.3-
   1, you can use SCACP to manage all OpenVMS Cluster interconnects.

   Starting with OpenVMS Version 8.4, OpenVMS is enhanced to use IP
   (Internet Protocol) for cluster communications. OpenVMS cluster
   over IP (also referred to as IP Cluster Interconnect) is the
   ability to use IP stacks for cluster communications. PEdriver
   which implements the cluster communication protocol uses UDP
   (User datagram protocol).

   Format

     RUN SYS$SYSTEM:SCACP

   To invoke SCACP, enter the following command at the DCL prompt:

   $ RUN SYS$SYSTEM:SCACP

   SCACP displays the following prompt, at which you can enter SCACP
   commands using the standard rules of DCL syntax:

   SCACP>

   To exit SCACP and return to the DCL command level, enter the EXIT
   command at the SCACP> prompt or press Ctrl/Z.