IBM OS/390 User Manual
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Reduce the size of a stand-alone dump. You can reduce the size of a
stand-alone dump as you transfer it from tape to a direct access storage
device (DASD) for IPCS processing.
stand-alone dump as you transfer it from tape to a direct access storage
device (DASD) for IPCS processing.
31.3.2 Traces
There are a number of traces available in the OS/390 environment:
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OS/390 System Trace. A low overhead trace that uses a System 390
architected instruction. The trace provides a summary of system processing
and is normally running continuously. This trace is present in all dumps.
architected instruction. The trace provides a summary of system processing
and is normally running continuously. This trace is present in all dumps.
•
Master Trace. Provides a log of the most recently issued console messages
at the time of a dump. This trace is formatted by IPCS when analyzing a
SDUMP or stand-alone dump.
at the time of a dump. This trace is formatted by IPCS when analyzing a
SDUMP or stand-alone dump.
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Component Trace. Shows processing within single OS/390 components and
almost always used under the guidance of the IBM support center.
almost always used under the guidance of the IBM support center.
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Generalized Trace Facility (GTF). OS/390 provides GTF to record trace data
to DASD, tape or in storage. Many OS/390 components and subsystems write
trace records to GTF with the most common being VTAM. GTF needs to be
started in order for the trace records to be recorded. In addition the system
programmer can issue SLIP commands to write trace records to GTF. GTF
trace records can be formatted by IPCS, in addition VTAM trace records that
are written to GTF can be formatted by ACFTAP.
to DASD, tape or in storage. Many OS/390 components and subsystems write
trace records to GTF with the most common being VTAM. GTF needs to be
started in order for the trace records to be recorded. In addition the system
programmer can issue SLIP commands to write trace records to GTF. GTF
trace records can be formatted by IPCS, in addition VTAM trace records that
are written to GTF can be formatted by ACFTAP.
31.3.3 Analyzing Traces
Using IPCS you can format the entries of any trace in a dump or trace data set.
You can also do the following with GTF and component trace records:
You can also do the following with GTF and component trace records:
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Selectively format records without deleting the unformatted data from the
buffer or dump.
buffer or dump.
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Find the system and time stamp for each record.
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Mix formatted GTF and component trace records without combining the
unformatted data.
unformatted data.
•
Reduce the number of records in a trace data set.
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Extract trace buffers from dumps.
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Combine GTF or component trace records into a single data set from
multiple trace data sets.
multiple trace data sets.
31.3.4 Using IPCS
IPCS is a TSO command and is normally invoked while a system programmer is
logged on to TSO, however in some cases it may be preferable to execute IPCS
as a job through a batch invocation of TSO. Since the IPCS command must be
executed before ISPF is invoked, there would normally be a separate logon
procedure for users of IPCS.
logged on to TSO, however in some cases it may be preferable to execute IPCS
as a job through a batch invocation of TSO. Since the IPCS command must be
executed before ISPF is invoked, there would normally be a separate logon
procedure for users of IPCS.
An IPCS dump directory needs to be allocated for each IPCS user. Each dump
directory can manage multiple dump data sets.
directory can manage multiple dump data sets.
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VSE to OS/390 Migration Workbook