Introduction › Overview

Overview

CA MII is the component of the CA MIM product that improves resource integrity and helps resolve resource conflicts in multiple-system environments. You can use CA MII to protect data sets, programs, or any other file type resource. CA MII does the following:

• Ensures the integrity of resources stored on direct access storage device (DASD) volumes that are shared by multiple systems or images
• Improves performance by providing an efficient way of serializing access to resources that are stored on shared DASD volumes
• Resolves certain resource conflicts automatically
• Accelerates the resolution of conflicts by issuing notification messages to the parties involved in those conflicts
• Prevents most of the common causes of data set damage, such as data set attribute changes, simultaneous updates, partitioned data set (PDS) directory overlays, and unauthorized updates

CA MII is composed of following three facilities:

• Global Data Integrity Facility (GDIF). This facility:
  • Ensures the integrity of shared resources
  • Provides an efficient method for accessing shared resources
• ENQ Conflict Management Facility (ECMF). This facility:
  • Issues messages to help resolve resource conflicts
  • Automatically resolves certain data set conflicts
• Enhanced Data Set Integrity Facility (EDIF). This facility:
  • Prevents programs from changing the attributes of a data set
  • Prevents simultaneous updates that can occur when tasks on the same system do not request serialization
  • Prevents programs from bypassing z/OS serialization when the wrong disposition is specified in the JCL of a job
  • Prevents unauthorized data set updates
  • Prevents unauthorized data set reads