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SMF Type 19 Record

This table shows the record layout for type 19 SMF records
(Direct Access Volume).

List of other SMF record layouts available.
List of sample SMF reports.

Purpose: Record type 19 is written:
1. For each online device associated with a specific IPL time frame,
2. For each online device associated with a processed HALT EOD or SWITCH SMF command, and
3. When a direct access volume that is defined by DD statement is demounted.

This record contains:

  • The volume serial number
  • The volume table of contents (VTOC) address
  • The owner identification
  • The unit type
  • The number of unused alternate tracks
  • The number of unallocated cylinders and tracks
  • The number of cylinders and tracks in the largest free extent
  • The number of unallocated extents.

It contains the device number and module identification for devices having movable plugs.

Notes:
1. Record type 19 is not produced for DOS volumes used under the operating system.
2. In order to determine the latest status of a shared file, the CPU clocks must be synchronized.

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SMF Type 19 Record -- Direct Access Volume
Offset
(Dec.)
Offset
(Hex)
NameLengthFormatDescription
00SMF19LEN2binary
Record length. This field and the next field (total of four bytes) form the RDW (record descriptor word). See “Standard SMF Record Header” on page 13-1 for a detailed description.
22SMF19SEG2binary
Segment descriptor (see record length field).
44SMF19FLG1binary
System indicator: Bit Meaning When Set 0-2 Reserved 3-6 Version indicators* 7 Reserved.*See “Standard SMF Record Header” on page 13-1 for a detailed description.
55SMF19RTY1binary
Record type 19 (X'13').
66SMF19TME4binary
Time since midnight, in hundredths of a second, when the record was moved into the SMF buffer.
10ASMF19DTE4packed
Date when the record was moved into the SMF buffer, in the form 0cyydddF. See “Standard SMF Record Header” on page 13-1 for a detailed description.
14ESMF19SID4EBCDIC
System identification (from the SID parameter).
1812SMF19RV12--
Reserved.
2014SMF19VOL6EBCDIC
Volume serial number.
261ASMF19OID10EBCDIC
Owner identification from the VTOC.
3624SMF19DEV4binary
Device type.
4028SMF19VTC5binary
Volume table of contents (VTOC) address (format of CCHHR).
452DSMF19VTI1binary
Volume table of contents (VTOC) indicator Bit Meaning When Set 0 Format 5 data set control blocks (DSCB) missing or erroneous 1-2 Reserved 3 VTOC does not begin on record 1 4 Accurate Format 5 and 6 data set control blocks (DSCB); bit 0 set to zero 5 Possible VTOC or VTOC index error 6 VTOC error has been fixed; bit 5 set to zero 7 Indexed VTOC.
462ESMF19NDS2binary
Number of data set control blocks (DSCB) calculated as: number of DSCBs per track times number of tracks in VTOC.
4830SMF19DSR2binary
Number of data set control blocks (DSCB) — format 0 DSCBs, that is, number of available DSCBs.
5032SMF19NAT2binary
Number of unused alternate tracks.
5234SMF19SPC2binary
Number of unallocated cylinders. 54 36 2 binary Number of unallocated tracks.
5638SMF19LEX2binary
Number of cylinders in the largest unallocated extent. 58 3A 2 binary Number of tracks in the largest unallocated extent.
603CSMF19NUE2binary
Number of unallocated extents.
623ESMF19RV22--
Reserved.
6440SMF19CUU2binary
Device Number.
6642SMF19IND2binary
Module identification or drive number indicating physical identity of devices having moveable address plugs. This field is taken from bits 2-7 of sense byte 4 for these devices. (See the component descriptions of these devices for the meaning of sense byte 4.)

The table above is based on the description provided by IBM in its "MVS Systems Management Facilities (SMF)" manual.

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