X'D1' trace entry
The X'D1' trace entry contains information about buffer invalidations or write errors.
Words 0 and 1 are common to all X’D1’ trace entries. The format of words 2 through 7 depends on the content of the trace entry.
- Word 0
- Byte 1
- Trace entry code X'D1'
- Byte 2
- Not used (no PST number)
- Bytes 3 and 4
- Trace sequence number
- Word 1
- Byte 1
- Sub-route code from the DFSNCB macro
- Bytes 2 and 3
- DMB number or PID for partition
- Byte 4
- DCB number
Words 2 - 7 for a buffer invalidation or write error notification record use the following format:
- Word 2
- RBN/RBA of buffer
- Word 3
- Buffer prefix address
- Word 4
- Byte 1
- SB global serialization trace field:
- X'80'
- Global serialization entered (SBH search started)
- X'40'
- Waiting PST was posted.
- Byte 2
- Not used
- Bytes 3 and 4
- Number of invalidated buffers
- Word 5
- Last invalidated buffer address
- Word 6
- Bytes 1, 2, and 3
- Not used
- Byte 4
- NCBFLAG
- Word 7
- Subsystem ID
Words 2 - 7 for an OSAM data set extent record use the following format:
- Word 2
- DCBHIBLK
- Word 3
- DCBRLBLK
- Word 4
- DCBRBASN
- Word 5
- Volume serial number
- Word 6
- Bytes 1 and 2
- Volume serial number
- Byte 3
- Not used
- Byte 4
- NCBFLAG
- Word 7
- Subsystem ID
Words 2 - 7 for a VSAM data set extent record use the following format:
- Word 2
- VSILVL - VSI level number (current)
- Word 3
- VSIHRBA - Highest relative byte address (current)
- Word 4
- VSILVL - VSI level number (extent)
- Word 5
- VSIHRBA - Highest relative byte address (extent)
- Word 6
- AMP address
- Word 7
- Subsystem ID