This section contains the common SMF record headers fields and the triplet fields (offset/length/number), if applicable, that locate the other sections on the record.
| Offsets | Name | Length | Format | Description | |
|---|---|---|---|---|---|
| 0 | 0 | SMF19LEN | 2 | binary | Record length. This field and the next field (total of four bytes) form the RDW (record descriptor word). See Standard SMF record header for a detailed description. |
| 2 | 2 | SMF19SEG | 2 | binary | Segment descriptor (see record length field). |
| 4 | 4 | SMF19FLG | 1 | binary | System indicator:
*See Standard SMF record header for a detailed description. |
| 5 | 5 | SMF19RTY | 1 | binary | Record type 19 (X'13'). |
| 6 | 6 | SMF19TME | 4 | binary | Time since midnight, in hundredths of a second, when the record was moved into the SMF buffer. |
| 10 | A | SMF19DTE | 4 | packed | Date when the record was moved into the SMF buffer, in the form 0cyydddF. See Standard SMF record header for a detailed description. |
| 14 | E | SMF19SID | 4 | EBCDIC | System identification (from the SID parameter). |
| 18 | 12 | SMF19RV1 | 2 | Reserved. | |
| 20 | 14 | SMF19VOL | 6 | EBCDIC | Volume serial number. |
| 26 | 1A | SMF19OID | 10 | EBCDIC | Owner identification from the VTOC. |
| 36 | 24 | SMF19DEV | 4 | binary | Device type. |
| 40 | 28 | SMF19VTC | 5 | binary | Volume table of contents (VTOC) address (format of CCHHR). |
| 45 | 2D | SMF19VTI | 1 | binary | Volume table of contents (VTOC) indicator
|
| The next 8 two byte fields describe free space statistics for the entire volume. When the value for a free space statistic exceeds the field size of two bytes, that field is set to all X'FFFF's. When this occurs, use the relocated values in SMF19EVF and SMF19TMF. | |||||
| 46 | 2E | SMF19NDS | 2 | binary | Number of data set control blocks (DSCB) calculated as: number of DSCBs per track times number of tracks in VTOC. |
| 48 | 30 | SMF19DSR | 2 | binary | Number of data set control blocks (DSCB) — format 0 DSCBs, that is, number of available DSCBs. |
| 50 | 32 | SMF19NAT | 2 | binary | Number of unused alternate tracks. |
| 52 | 34 | SMF19SPC | 2 | binary | Number of unallocated cylinders. |
| 54 | 36 | 2 | binary | Number of unallocated tracks. | |
| 56 | 38 | SMF19LEX | 2 | binary | Number of cylinders in the largest unallocated extent. |
| 58 | 3A | 2 | binary | Number of tracks in the largest unallocated extent. | |
| 60 | 3C | SMF19NUE | 2 | binary | Number of unallocated extents. |
| 62 | 3E | SMF19FL1 | 1 | binary | SMF flags 1.
|
| 63 | 3F | SMF19FL2 | 1 | binary | Reserved. |
| 64 | 40 | SMF19CUU | 2 | binary | Device Number. |
| 66 | 42 | SMF19IND | 2 | binary | 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.) |
| Beginning of expanded SMF statistics | |||||
| 68 | 44 | SMF19RV3 | 4 | EBCDIC | Reserved. |
| 72 | 48 | SMF19SDS | 4 | binary | Number of DSCBs. |
| 76 | 4C | SMF19SL0 | 4 | binary | Number of format 0 DSCBs. |
| 80 | 50 | SMF19RV4 | 4 | EBCDIC | Reserved. |
| SMF19EVF: free space statistics from the entire volume. For volumes with cylinder-managed space (SMF19CYM='1'), these statistics represent space from both the track- and cylinder-managed space on the volume. See SMF19TMF for statistics from the track-managed space on the volume. | |||||
| 84 | 54 | SMF19EVF | 20 | EBCDIC | Total vol free space. |
| 84 | 54 | SMF19SUC | 4 | binary | Number of free cylinders. |
| 88 | 58 | SMF19SUT | 4 | binary | Number of addl free tracks. |
| 92 | 5C | SMF19SNC | 4 | binary | Number of free cylinders in largest free extent. |
| 96 | 60 | SMF19SNT | 4 | binary | Number of addl free tracks in largest free extent. |
| 100 | 64 | SMF19SNE | 4 | binary | Number of free extents. |
| SMF19TMF: free space statistics from track-managed space on a volume for a volume with cylinder-managed space (SMF19CYM='1'). For volumes with no cylinder-managed space (SMF19CYM='0'), these statistics are equivalent to the total volume statistics described above. | |||||
| 104 | 68 | SMF19TMF | 20 | EBCDIC | Track-managed free space. |
| 104 | 68 | SMF19BUC | 4 | binary | Number of free cylinders. |
| 108 | 6C | SMF19BUT | 4 | binary | Number of addl free tracks. |
| 112 | 70 | SMF19BNC | 4 | binary | Number of free cylinders in largest free extent |
| 116 | 74 | SMF19BNT | 4 | binary | Number of addl free tracks in largest free extent. |
| 120 | 78 | SMF19BNE | 4 | binary | Number of free extents. |
| Volume size information | |||||
| 124 | 7C | SMF19VLI | 8 | EBCDIC | Volume size infomation |
| 124 | 7C | SMF19TRK | 4 | binary | Total number of tracks on the volume |
| 128 | 80 | SMF19TRM | 4 | binary | Total number of tracks in the track-managed space when SMF19CYM = '1'. Set to the value of SMF19TRK otherwise. When SMF19CYM ='1' this value is also the first track address where cylinder-managed space begins. |
| End of expanded SMF statistics | |||||