Basic XIM processing principles

XIM is initiated by BMC products to manage copies of various types of utilities.

Copies of these various types of utilities are processed on one or more MVS images, as shown in the following figure. A copy of the utility is known as a unit of work (UOW). Each BMC product determines the extent of a UOW. For example, a UOW can be the reorganization of a subset of an IMS database or the unload of a DB2 table space partition.

XIM executes as a separate MVS job or started task. You must start XIM on each image where products use XIM as a distribution point for UOWs. XIM uses the services of the IBM cross-system coupling facility (XCF) to locate and connect to other instances of itself within your MVS sysplex. By default, XIM distributes UOWs across all known XIM images in an XIM group.

The installation process for XIM constructs the started task procedure and the initiator procedure in the HLQ.JCL data set (HLQ is the high-level qualifier that you choose when installing XIM). The default name of the XIM started task procedure is XIMBMC. The default name of the XIM initiator procedure is either the name you entered on the screen as the value for the INIT_PROC option or the default of XIMI. You must copy these two procedures into a procedure library recognized by your JES subsystem. For more information, see Installing-and-configuring-XIM.