- Entry:
- SIOD, SIOI, SIOL, SIOT, or SIOX
- VIT option:
- CIO
- Event:
- Start I/O
- VIT processing module:
- ISTRACCI
- Control is returned to:
- ISTTSCIO or ISTTSCLC
This trace record is written when a Start I/O SVC is issued.
- SIOD is generated for OSA-Express QDIO
or HiperSockets™ adapters.
- SIOI is generated for communication controllers and local SNA
cluster controllers.
- SIOL is generated for local non-SNA cluster controllers.
- SIOT is generated for a TCP/IP DLC connection.
- SIOX is generated for channel-to-channel-attached hosts and channel-attached IBM® 3172 Interconnect Controllers.
Eventually, an INTx or PCIx entry follows the SIO trace
record. Use the CUA field to correlate the entries.
For record types with suffix D, I, X, or T, the CIO events
are also captured within the NCB (pointed to by NCBCIOMV). The NCB
trace table is mapped by NCBCIOAR.