gtpo1mhj | Operations |
The stand-alone dump (SADUMP) utility is an offline utility that can be IPLed from tape. It is used to dump main storage when a normal online dump cannot be processed because of a system hang condition.
The SADUMP utility is assembled into an object library during the system initialization program (SIP). Then, it is loaded to a nonlabeled tape using IEBGENER. See TPF System Generation for more information about SIP.
When the tape is IPLed, the dump is written after the SADUMP program, so the tape can be reused for subsequent dumps without reloading the SADUMP object code.
The following is a sample of the JCL that you need to load the SADUMP utility to tape:
//SADLOAD EXEC PGM=IEBGENER,REGION=58K //SYSPRINT DD SYSOUT=A //SYSIN DD DUMMY //SYSUT1 DD DSN=*OBJECT.LIBRARY*(SADUMP40),DISP=SHR //SYSUT2 DD DSN=DUMP.TAPE,UNIT=TAPE,DISP=(NEW,KEEP),LABEL=(,NL), // VOL=SER=XXXXXX,DCB=(RECFM=FB,LRECL=80,BLKSIZE=80)
If there is a system hang condition, follow these procedures:
Even if you do not enter STORE STATUS, the dump is still performed. However, the control registers, current PSW, CPU Timer, and TOD clock comparator values are not captured. The general purpose registers are always captured.
All communication with the operator is through the current PSW.
When the dump ends successfully, the SADUMP tape is rewound and unloaded and the TPF system is placed in a disabled wait state with the following PSW:
If the memory size exceeds the capacity of the SADUMP tape, the first tape is unloaded and the TPF system is placed in an enabled wait state (no PSW displays on the operator control panel) until you mount a second tape on the same tape device. The second tape can be any scratch tape. When the second tape is readied, the dump continues to normal end-of-job status.
If you are in doubt about the status of the dump, stop the processor and display the current PSW. The following PSW indicates that the dump is waiting for a second tape:
X'020A00000000FEED'
If the dump finds an irrecoverable error, the SADUMP tape stops without rewinding or unloading.
The TPF system is placed in a disabled wait state and displays a PSW that contains error information in the following format:
X'000A0000'xxxxyyyy
where:
The TPF system is placed in a disabled wait state and displays a PSW that contains error information in the following format:
X'000A0000'xxxxxxx
where: