CVAF Ctrace events

The following CVAF events are traced. The heading names such as 'Write DSCB to VTOC' are the names used by IPCS to describe each record.

Write DSCB to VTOC
Recorded when CVAF writes a DSCB to the VTOC. Trace data includes the VOLSER and DSCB. Recorded by module ICVDSD01 and ICVDSD02. Restriction: CVAF does not write format-0 and format-4 DSCBs. Therefore, no trace record is created for them.
Write VIR to VTOC index
Recorded when a VTOC index record (VIR) is written to the VTOC index. Trace data includes the VOLSER and Dataset Name and 1 or more VTOC information records (VIRs). Recorded by module ICVCMI00
Add Index
Recorded when a data set name and a CCHHR pointer are added to the VTOC index. Trace data includes the VOLSER and DSNAME. Recorded by module ICVIXA00
Delete Index
Recorded when a data set name is deleted from the VTOC index. Trace data includes the VOLSER and DSNAME. Recorded by module ICVIXD00
Allocate Space from VPSM
Recorded when space on the volume is allocated from the volume pack space map (VPSM). If the space request fails, the trace record is not written. Trace data includes the VOLSER and the Extent Descriptor Table (recorded in a second trace record). Recorded by module ICVDMS01
Release Space from VPSM
Recorded when space on the volume is released from the volume pack space map (VPSM). Trace data includes the VOLSER and the Extent Descriptor Table (recorded in a second trace record). Recorded by module ICVDMS01
Allocate VTOC Index Space
Recorded when a VTOC index record is allocated and marked in the VTOC index map (VIXM) as available for allocation. Trace data includes the VOLSER and CCHHR. Recorded by module ICVDMS02
Release VTOC Index Space
Recorded when a VTOC index record is released and marked in the VIXM as unavailable for subsequent allocation. Trace data includes the VOLSER and CCHHR. Recorded by module ICVDMS02
Allocate VTOC Space
Recorded when a format-0 DSCB is allocated; the VTOC map of DSCBs (VMDS) is updated to indicate that the DSCB is allocated. Trace data includes the VOLSER and CCHHR. Recorded by module ICVDMS02
Release VTOC Space
Recorded when a DSCB (all formats) is released and marked in the VMDS as unallocated. Trace data includes the VOLSER and CCHHR. Recorded by module ICVDMS02
CVAF Entry
Recorded on entry to CVAF module ICVCMM00. Trace data includes the CVAF parameter list (CVPL). Recorded by module ICVMM00.
CVAF Exit
Recorded on exit from CVAF module ICVCMM00. Trace data includes the CVAF parameter list (CVPL). Recorded by module ICVCMM00.
Read or Write multiple DSCBs
Recorded when CVAF reads or writes multiple DSCBs to the VTOC. Trace data includes the VOLSER and DSCB and 1 or more DSCB processed by this CVAF request. Recorded by module ICVDSD02.