StorageTek 6 manual VM CP Debug Commands, SCP SET TRACE Command, SCP Internal Trace Table

VM (CP) Debug Commands

The following CP commands are useful in diagnosing problems in the system. See appropriate VM documentation for details on syntax and use.

ADSTOP	Single address stop (VM/SP, VM/SP HPO, and VM/ESA 370)
BEGIN	Start execution
CPTRACE	Enable and disable event tracing (VM/XA and VM/ESA)
CPTRAP	Enable and disable event tracing (VM/SP, VM/SP HPO, VM/ESA 370)
DISPLAY	Display registers, PSW, storage
STORE	Alter registers, PSW, storage
TRACE/PER	Multiple break-points
TRAPRED	Format CP trace table (VM/SP, VM/SP HPO, and VM/ESA 370)
TRSAVE	Define locations for saving trace data
TRSOURCE	Define I/O, data, and guest traces (VM/XA and VM/ESA)
VMDUMP	Dump the virtual machine’s storage.

SCP SET TRACE Command

The SET TRACE command allows the operator to enable and disable the control program execution trace feature. It is also known as the TRACE command. In essence, SET TRACE corresponds to the Generalized Trace Facility (GTF) in MVS. Refer to “SCP External Trace Facility” on page 367 for more information about SCP tracing.

This command interacts with the HSC TRace command. The SCP TRACE command must have event USR enabled, and the HSC TRace command must have some component enabled for tracing for there to be any HSC event tracing.

TRACE Command Syntax

For a detailed description of how to use the TRACE command, refer to the HSC Operator’s Guide.

SCP Internal Trace Table

The SCP internal trace table is comprised of two data areas:

•MTTH (Master Trace Table Header), and

•trace table entries.

Events for the system TRACE task (SLKTKT) are not traced internally or externally. The internal trace table does NOT contain ‘USR’ events generated by the GTRACE function.

Chapter 5. Problem Determination, Diagnostics, and Recovery 349

1st ed., 6/30/04 - 312579601