SIOx entry for Start I/O
- 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.
See z/OS® Communications Server: SNA Data Areas Volume 1 for a description of the NCB fields.
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.