StorageTek Host Software Component 6 User Manual

1st ed., 6/30/04 - 312579601

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

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. 

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

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. 

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.