Before using this component trace
This topic assumes you have read:
IOS component trace is described by the following attributes:
- Trace buffers reside in common ESQA Subpool 248. Size is controlled by the TRACE CT operator command. As the buffers become full they are copied to a private IOS data space. For information on specifying an IOS data space size, see OPTIONS parameter.
- Minimal and unexpected event tracing is activated during IOS NIP processing.
- Component trace buffers externalized through:
- DUMP or SLIP operator command when the IOS address space is requested to be dumped.
- SVC dumps issued by IOS, dynamic device reconfiguration (DDR), or execute channel program (EXCP) component recovery.
- MVS™ component trace (CTRACE) external writer
- Trace options revert to minimal event and exception tracing when the operator turns the trace off.
The following summarizes information for requesting a SYSIOS component trace for IOS:
| Information | For SYSIOS: |
|---|---|
| Parmlib member | CTnIOSxx specified in the IECIOSxx member through the CTRACE(CTnIOSxx) statement. Default member: None |
| Default tracing | Yes, activated during IOS NIP processing. |
| Trace request OPTIONS parameter | In CTnIOSxx or REPLY for TRACE command |
| Buffer |
|
| Trace records location | Common ESQA subpool 248 and SYSIOS private IOS data space and
trace data set. By DUMP or SLIP command when the IOS address space is requested to be dumped. In the REPLY for the DUMP command, specify the IOS address space to be dumped. By SLIP command. By the component during SVC dumps issued by IOS, DDR, or EXCP component recovery. |
| Trace formatting by IPCS | CTRACE COMP(SYSIOS) |
| Trace format OPTIONS parameter | No |
The areas of IOS traced as part of minimal and unexpected event
tracing include:
- Dynamic Configuration Changes
- Parallel Access Volume (PAV) Processing
- Dynamic Channel Path Management (DCM) Processing
- Unconditional Reserve (U/R) Recovery Processing
- Channel Subsystem Call (CHSC) Processing
- Channel Report Word (CRW) Processing
- Missing Interrupt Handler (MIH) Recovery Processing
- Control Unit Initiated Reconfiguration (C.U.I.R.) Request Processing
- Dynamic Pathing Support (DPS) Validation
- Dynamic Device Reconfiguration (DDR) Processing
- Self-Description Processing
PCIE Initialization and Exceptional
Conditions Processing
Note: Additional areas are traced when OPTIONS are set for IOS component
trace. See OPTIONS parameter.