This trace record is the first record in an 8K external
VIT buffer. It determines if the 8K buffer was written to the external
trace file in the proper sequence. It also indicates whether enough
8K buffers were specified on the TRACE start option or the MODIFY
TRACE command by counting the records that were individually GTRACEd.
- Byte (hex)
- Contents
- 00–03
- Record ID: "BUFF"
- 04
- ID is the primary address space ID (ASID). This field is 0 if
the ASID is greater than X'FF'.
- 05
- 0
- 06–07
- Current BFRNUM
value (as specified on TRACE start option or MODIFY TRACE command)
- 08–0B
- Count of VIT records individually GTRACEd because of a lack of
8K buffers
- 0C–0F
- Buffer sequence number
- 10–17
- Time stamp of first VIT record in the buffer
- 18–1B
- 0
- 1C–1F
- RPH address