Types of system dumps

The following table describes the various types of dumps. If a dump is known by more than one name, the table also mentions the alternate name.

For a sample of the kind of information in the formatted portion of a typical SVC dump, see Abend keyword.

Dump Data Set Type Print By Caused By
SYSABEND Defined by JCL (SYSOUT=A) Formatted Normally SYSOUT=A An abend condition (and only taken if the step contains a SYSABEND DD statement).
SYSUDUMP Defined by JCL (SYSOUT=A) Formatted Normally SYSOUT=A An abend condition (and only taken if the step contains a SYSUDUMP DD statement).
SYSMDUMP Defined by JCL (DSN=xxx) Machine readable Normally read through IPCS An abend condition (and only taken if the step contains a SYSMDUMP DD statement).
STANDALONE Defined by installation (tape or disk) Machine readable Printed and formatted through IPCS Operator doing an IPL of the standalone dump program.
DYNAMIC (SVC Dump or SDUMP) SYS1.DUMPxx Machine readable Printed and formatted through IPCS Operator entering DUMP command.
FRR (SVC Dump or SDUMP) SYS1.DUMPxx Machine readable Printed and formatted through IPCS DFSMS ESTAE exit or functional recovery routine detecting an error. (For example, an ABEND071 "PSW restart key depressed" causes an FRR to take a dump.)
Note:
  1. For a complete description of the IPCS dump formatter, see z/OS MVS IPCS User's Guidez/OS MVS IPCS User's Guide.
  2. The IPCS SUMDUMP option provides a useful summary of failure-related information from SYS1.DUMPxx data sets.
  3. For detailed information about diagnosing dumps, see z/OS MVS Diagnosis: Tools and Service Aids.