SMF layout
The header section for SMF record type 122, subtype 2, holds a standard SMF header followed by fields that reference the data section. Character strings in the header are in EBCDIC and character strings in the DBB data section are in UTF-8.
Header section
See standard header for more information. Most of the information is filled in by the system when the record is written.
| Offsets | Type/Value | Length | Name | Description |
|---|---|---|---|---|
| 0 (x0) | Structure | 24 | SMFHDR | ** Standard SMF header ** |
| 0 (x0) | Structure | 4 | SMFRDW | ** SMF Record descriptor word ** |
| 0 (x0) | Unsigned | 2 | SMFLEN | Record length. This field and the next field (total of 4 bytes) form the record descriptor word (RDW), which is removed when the record is dumped. |
| 2 (x2) | Unsigned | 2 | SMFSEG | Spanned segment descriptor. This field and the previous field (total of 4 bytes) form the record descriptor word (RDW), which is removed when the record is dumped. |
| 4 (x4) | Bitstring | 1 | SMFFLG | SMF header flag byte. |
| .1.. .... | SMSSTV | (x40) Subtypes are being used. | ||
| 5 (x5) | Unsigned | 1 | SMFRTY | Record type: 122 (x7A) |
| 6 (x6) | Unsigned | 4 | SMFTME | Time since midnight, in hundredths of a second, that has elapsed since the record was moved into the SMF buffer (format: HHMMSSth). |
| 10 (xA) | Packed | 4 | SMFDAT | Date when the record was moved into the SMF buffer. In the form of 0cyydddF, where c is 0 for 19xx and 1 for 20xx, yy is the current year (0-99), ddd is the current day (1-366), and F is the sign. |
| 14 (xE) | EBCDIC | 4 | SMFSID | System identification (from the SMF SID parameter). |
| 18 (x12) | EBCDIC | 4 | SMFWID | Subsystem ID. |
| 22 (x16) | Unsigned | 2 | SMFSTP | Record subtype: 2 (x2) |
| 24 (x18) | ||||
| 24 (x18) | Structure | 12 | SMF122t2h_Head | ** SMF type 122 subtype 2 specific header ** |
| 24 (x18) | 4 | -- header description | ||
| 24 (x18) | Unsigned | 2 | SMF122t2h_Cnt | Number of data section triplets. It is set to the number of data section identifier blocks that follow. |
| 26 (x1A) | Unsigned | 2 | ||
| 28 (x1C) | Structure | 8 | -- triplet for data sections | |
| 28 (x1C) | Unsigned | 4 | SMF122t2h_S1Offset | Section offset. The offset, from the start of the record, of this section block. |
| 32 (x20) | Unsigned | 2 | SMF122t2h_S1Len | Section length. It is set to the size of SMF122t1s1_Section. |
| 34 (x22) | Unsigned | 2 | SMF122t2h_S1Cnt | Number of sections (x1) |
Beginning with DBB 3.0.1, the data sections of the DBB SMF record have changed. If you migrate from earlier versions to DBB 3.0.1, you might need to read both versions of the SMF record. If using the DBB SMF APIs as demonstrated in the ReadSMFRecords sample, the APIs will handle both SMF record formats. For those reading the records themselves, note that the old format has only 1 triplet and the new format has multiple triplets. The same information is available for both.
For DBB 3.0.0 and earlier, there is only one data section or triplet and its layout is described in the SMF data section layout for DBB 3.0.0 and earlier.
For DBB 3.0.1 and later, there are multiple data sections or triplets and its layout is described in the SMF data sections layout for DBB 3.0.1 and later.