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Z Abend Investigator installation and administration
Using the Z Abend Investigator HFZS subsystem
Z Abend Investigator uses a subsystem known as HFZS for services that can otherwise not be performed or which might cause incomplete analysis if not started.
Stopping the HFZS subsystem
The HFZS subsystem can be stopped and restarted at any time.

Z Abend Investigator installation and administration
- Preparing to customize Z Abend Investigator
- Customizing the operating environment for Z Abend Investigator
- Using the Z Abend Investigator HFZS subsystem
  Z Abend Investigator uses a subsystem known as HFZS for services that can otherwise not be performed or which might cause incomplete analysis if not started.
  - Sysplex-wide subsystem inter-communication
    Multiple HFZS subsystems in a sysplex interface with one another using the Cross-system Coupling Facility (XCF) to allow efficient sharing of subsystem-managed data, such as the caching of $$INDEX data.
  - Caching of history file $$INDEX data
  - Starting the HFZS subsystem
  - Stopping the HFZS subsystem
    The HFZS subsystem can be stopped and restarted at any time.
- Modifying your ISPF environment
- Customize Z Abend Investigator by using USERMODs
- Customize Z Abend Investigator by using an HFZOPTLM configuration-options module
- Setting up history files
  Z Abend Investigator requires at least one PDS or PDSE data set to be allocated as a fault history file.
- Setting and changing default options for the site
- Providing compiler listings or Z Abend Investigator side files
- Customizing the CICS environment
- Customizing the DB2 environment
- Customizing the IMS environment
- Customizing the Z Abend Investigator Japanese feature
- Verifying Z Abend Investigator customization
- Managing history files (HFZUTIL utility)
  The HFZUTIL batch utility can be used to perform history file management functions, such as listing and deleting history file fault entries.
- Providing application-specific explanations and descriptions
- Maintaining Z Abend Investigator
- Disabling Z Abend Investigator
- Customizing Z Abend Investigator by using user exits

Stopping the HFZS subsystem

The HFZS subsystem can be stopped and restarted at any time.

When the HFZS subsystem is inactive (stopped), all Z Abend Investigator processes continue to run, except for some DB2® catalog data access. There is also an increase in CPU and I/O usage, compared to having the HFZS subsystem running with PARM='UPDINDEX'.

Attention: Never use the CANCEL command to stop the HFZS subsystem.

To permit normal termination, use a MODIFY command to stop the HFZS subsystem by, for example: F name,STOP or P name

where name is the appropriate identifier for the MODIFY command, depending on how the HFZS subsystem was started.

If either the HFZS subsystem is not active, or if an incorrect identifier was used on the MODIFY command, MVS™ issues the message:

IEE341I XYZ               NOT ACTIVE

If the HFZS subsystem is already active when another attempt to start it is performed, the following message is issued to the operator console:

HFZSAMAN The Z Abend Investigator Subsystem is already active in jobname job-id

where jobname is the job or started task name of the currently executing HFZS subsystem and job-id is the JES job or started task ID.