Enterprise Server Processes

CASCD - Region Console Daemon

CASCD manages region processes and console log messages. There is one of these console daemon process for every region. It is started by the casstart process.

CASCD is the parent of all other processes that run for the lifetime of the region. If it detects they have died, it informs CASMGR and restarts them.

Responsibities:

Starting processes
Monitoring started processes
Informing Server Manager of any process termination
Console Messages

CASMGR - Region Server Manager

CASMGR is started by the CASCD process, and works in conjunction with the Console Daemon to provide process management. There is one server manager process per region, represented by a DCA control block in shared memory.

Responsibilities:

Creates and manages the IPC area (shared memory) based on configuration data from MFDS
Controls the system state of Enterprise Server
Participates in error recovery processing
Handles CICS Interval Control Processing
Monitors region state for timeouts and deadlocks
Dispatches JCL jobs to initiators

CASTRC - Region Trace Control (TRC) [21]

CASTRC writes trace to disk when auxiliary tracing is active and generates HSF data. There is one process per region. It is started by CASCD.

Responsibilities:

Auxiliary trace hardening - to casauxta.rec and casauxtb.rec
Creation of historical statistic information

CASTSC - Region Temporary Storage, Channels and Containers Control (TSC)

CASTSC controls temporary storage, channels, and containers. There is one process per region. It is started by CASCD.

Responsibilities:

CICS Channels and Containers support
Historical Statistics Facility
Auxiliary trace logging
CICS journal control
CICS extra-partition transient data processing
Distribution of system events to interested parties

MFCS - Micro Focus Communication Server

MFCS is the region communication component which handles the communication between clients and the Enterprise Server. There can be one or more communications servers per region depending on capacity needs.

MFCS is started by CASCD and contains the following service listeners:

TN3270
CICS ISC
Web Services

It is represented by a TCTS control block in shared memory.

CASDBC - IMS Database Control

CASDBC is responsible for IMS DB support and is an optional component with one for every region. It is started by CASCD.

CASTMC - IMS Transaction Manager Control

CASTMC is responsible for IMS TM support, and is an optional component with one for every region. It is started by CASCD.