Updating SAP ABAP Systems on UNIX and Linux: SAP MaxDB

Checking the Central Services Requirements for ABAP

Context

You have to meet the following requirements before you update your system:

  • The message server has to run at the SAP Central Services instance (SCS, ASCS) or on the host with the primary application server instance.

    During the update, the Software Update Manager uses Remote Function Call (RFC) to call function modules and temporarily schedules ABAP report programs for background processing.

    For this reason, the message server has to still be running, especially after the additional application server instances are stopped. You can only guarantee this if the message server is located at the SAP Central Services instance on the same host as the primary application server instance.

SAP systems installed in the standard way meet the specified Central Services requirements for ABAP.

If you are not running a distributed or high availability system, or you are not sure whether you have a standard installation, you can use the following procedure to check the Central Services requirements.

Procedure

  1. Call transaction RZ10.
  2. Choose Start of the navigation pathGoto Next navigation step Profile values Next navigation step Of a serverEnd of the navigation path.
  3. Choose the server (host) where the primary application server instance is running.

    The profile parameters for this server are displayed with their values.

  4. Check the profile parameter rdisp/mshost.

    This parameter contains the host name where the message server is running. It has to run on the central instance or on the same host as the primary application server instance. This makes sure that the message server is active during downtime, because only the primary application server instance runs during downtime, while the additional application server instances are stopped.

  5. If you have made changes to the standard SAP system, check the profile parameter rdisp/wp_no_vb. This parameter displays the number of update processes for the primary application server instance. The number should be greater than 0.