M Running the oVTCS CDS Database Server

The oVTCS CDS database server component proxy enables a client oVTCS running on the VSM console server to act as a local z/OS VTCS so that it can access the z/OS-resident CDS database.

The oVTCS client must have its own "host slot" within the CDS to send and receive broadcast messages, hold locks, and so forth. This requirement imposes the following limitations on executing the oVTCS CDS database server:

  • The oVTCS CDS database server cannot execute on a z/OS host that has VTCS executing or that may have VTCS executing. The HSC subsystem must be started with the NOVTCS startup parameter specified in the EXEC statement.

  • The oVTCS CDS database server is restricted to communicating with a single oVTCS client; there is a 1-to-1 relationship between client and server. For example, if there are two oVTCS appliances, they each require their own HSC host. As a result, there are two instances of HSC each executing their own oVTCS CDS database server as shown in Figure M-1:

    Figure M-1 Relationship Between oVTCS Client and oVTCS CDS DB Server

    Surrounding text describes Figure M-1 .

    The "Server Host ID" boxes in Figure M-1 represent the server on which the DBSERVer command is issued (see "DBSERVer command" in the ELS Command, Control Statement, and Utility Reference). It is also the host that supplies the proxy host ID for the oVTCS client CDS. Thus, oVTCS1 is host ID MVSA and oVTCS2 is host ID MVSB. Note that MVSA and MVSB may share the same CDS, but they must have separate host IDs.

  • The oVTCS CDS database server requires HSC database services be active. Therefore, the oVTCS CDS database server cannot be started before the HSC has reached BASE service level.

  • You can include the DBSERVer START command in the HSC startup parameter file, or you can issue it as an HSC operator command. It is not a UUI/XAPI enabled command.

  • The oVTCS CDS database server requires its own TCP/IP port assignment for its socket listener. The port number is specified on the DBSERVer START command. If you execute the SMC HTTP server on the same host as the oVTCS CDS database server, you must specify different port numbers.

  • If requested by Oracle StorageTek Software support, use GTF and the TRace VTcs command to enable tracing of the oVTCS CDS database server on z/OS.