IEACMD00 (IBM-supplied commands)

IEACMD00 contains IBM-supplied commands, as follows:

A CHNGDUMP command to add trace table, LSQA and XES information to SVC dumps.
A SET command (SET SLIP=00) to indicate that the system is to use the IEASLP00 parmlib member to issue IBM-supplied SLIP commands.
A SET command (SET DAE=00) to indicate that the system is to use the ADYSET00 parmlib member to start DAE processing.
A START command (START LLA, SUB=MSTR) to start the library lookaside (LLA) procedure, which resides in SYS1.PROCLIB. The LLA procedure then starts the library lookaside function.
A START command (START BLSJPRMI, SUB=MSTR) creates IPCS tables which allows SNAP ABDUMP and IPCS to print formatted control blocks in dumps.
A START command (START IFGEDI,SUB=MSTR) enables enhanced data integrity for physical sequential data sets.

An installation that uses the optional COMMNDxx parmlib member should check for commands in COMMNDxx that conflict with commands in IEACMD00, and resolve any conflicts. It is also recommended that an installation place its commands in the COMMNDxx member, leaving the IEACMD00 member for IBM-supplied commands only.

Place all SLIP commands in IEASLPxx.

Note:

The order in which task-creating commands appear in IEACMD00 does NOT guarantee the order in which they are executed. Thus, IEACMD00 should not be used for commands that must be executed in a specific order. Commands are issued in the order that they appear in IEACMD00, but they are executed as follows:
- Immediate commands, such as DISPLAY T, are executed sequentially as they are issued from IEACMD00.
- Execution of task-creating commands, such as DISPLAY A, are deferred until system initialization is complete. Then, factors such as multitasking, multiprocessing, and competition for resources influence the order in which these commands are executed.
  Thus, IEACMD00 should not be used to issue task-creating commands that must be executed in a specific order, because the execution order of these commands can vary.
The SET SLIP=00 command causes the IBM-supplied IEASLP00 parmlib member to execute. As a result, the SLIP commands specified in IEASLP00 are in effect at IPL-time. These commands suppress dumps that are considered to be unnecessary. For more information about IEASLP00, see IEASLPxx (SLIP commands).
To activate an IEASLPxx member instead of the IBM-supplied member (IEASLP00), change the SET SLIP=00 command to SET SLIP=xx (where xx is the two character suffix of the alternate IEASLPxx member to be used).
The SET DAE=00 command causes the ADYSET00 parmlib member to execute. As a result, dump analysis and elimination (DAE) processing as specified in ADYSET00 is in effect.
To prevent the system from activating DAE automatically, change ADYSET00 to contain DAE=STOP.

For more information about DAE and its parmlib members, see ADYSETxx (dump suppression).
For descriptions of the CHNGDUMP, SET, START, and SLIP commands, see z/OS MVS System Commands.