Example

Figure 1 shows an example of VIT records written with MODE=INT and printed in dump output. Six of the eight default trace options (API, CIO, MSG, NRM, PIU, and SSCP) are always active.

Figure 1. Unformatted VIT records in dump output (MODE=INT)

E2C3C8C4 14202810 06308E88 00C17248  8652D180 00000000 C9D5E3D4 00000000  *  SCHD.......h.A..f.J.....INTM....  *
E2D9C2C4 14000000 06308E88 80000000  00000000 00000000 007FF158 00800000  *  SRBD.......h............."1.....  *
E2D9C2E7 14000000 06308E88 00000000  00000000 00EBDE80 00EBDE80 824C4B82  *  SRBX.......h................b<.b  *
C9D9C2C4 14000000 06308E88 80000000  00C17248 007DDB18 007FF158 00800000  *  IRBD.......h.....A...'..."1.....  *
D9C5D8E2 14170000 06308E88 06324810  81C23E1A 00010000 06300DA0 00000000  *  REQS.......h....aB..............  *
C4E2D740 1400A810 06308E88 00C17248  00000000 00000000 C9D5E3D4 06324810  *  DSP ..y....h.A..........INTM....  *
C3C3C900 14588000 06324A20 00000000  8652D13A 00000000 58588000 00000000  *  CCI.......+.....f.J.............  *
D8E4C558 14482410 06308E88 00C17908  824EAA8C 0651C928 E3E2E6E4 06324810  *  QUE........h.A..b+....I.TSWU....  *
C5E7C9E3 14000010 06308E88 00C17248  8652CF74 80000000 C9D5E3D4 06324810  *  EXIT.......h.A..f.......INTM....  *
D9C5D3E2 14170000 06308E88 06324810  81C23E92 00000000 06300DA0 00000000  *  RELS.......h....aB.k............  *
C4E2D740 14582410 06308E88 00C17908  0651C928 0651C928 E3E2E6E4 0631D810  *  DSP .......h.A....I...I.TSWU..Q.  *
D8E4C558 14482810 06308E88 00C17248  86615658 0651C928 C9D5E3D4 0631D810  *  QUE........h.A..f/....I.INTM..Q.  *
C5E7C9E3 14000010 06308E88 00C17908  86615708 80000000 E3E2E6E4 0631D810  *  EXIT.......h.A..f/......TSWU..Q.  *
D9C5D8E2 14170000 06308E88 06324810  81C23E1A 00010000 06300DA0 00000000  *  REQS.......h....aB..............  *
C4E2D740 14582810 06308E88 00C17248  0651C928 0651C928 C9D5E3D4 06324810  *  DSP .......h.A....I...I.INTM....  *
C5E7C9E3 14000010 06308E88 00C17248  8652CF74 80000000 C9D5E3D4 06324810  *  EXIT.......h.A..f.......INTM....  *

The start of the internal trace table is the header. (The header is not included in the this example.) The header contains the following status information:

Byte (hex): Contents
00–03: Eyecatcher (C'VITH')
04–0F: Reserved
10–17: Control area
18–1F: Reserved
20-27: Present wraparound time stamp
28-2F: Last wraparound time stamp
30-37: Address of the most recent entry in the table
38-3F: Address of the last entry in the table

See Extracting VIT information from a dump for the information about how to analyze dumps.