Modernization Hub

IOCP

Input/Output Configuration Program
Enhanced Definition

Utility used to define I/O configuration for mainframe systems, generating IOCDS (I/O Configuration Data Set) that describes hardware configuration to the operating system.

Key Characteristics

    • Hardware configuration definition
    • IOCDS generation
    • Configuration validation
    • Multiple configuration support
    • Documentation generation
  • IOCP Statements:
    • ID: Configuration identification
    • RESOURCE: Processor definition
    • CHPID: Channel path identification
    • CNTLUNIT: Control unit definition
    • IODEVICE: Device definition
    • IOPATH: Path connections
  • Configuration Process:
    1. Define processors and channels 2. Define control units 3. Define devices 4. Specify connectivity 5. Validate configuration 6. Generate IOCDS 7. Activate configuration

Use Cases

    • Initial system configuration
    • Adding new devices
    • Modifying I/O paths
    • Disaster recovery setup
    • System upgrades

Related Concepts

Related to: HCD, IOCDS, Channel, Device

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