








	*SMF Tools*

SMF Type 41 Record

This table shows the record layout for type 41 SMF records
(DIV Objects and VLF Statistics).

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

Purpose: Record type 41 provides resource usage information regarding data-in-virtual (DIV) objects and VLF statistics. This record is written when a DIV object is accessed, and when the object is unaccessed.

Note: ACCESS and UNACCESS is similar to OPEN and CLOSE. This record is also written to record VLF statistics.

Record type 41 has the following subtypes; each contains a common section with header and product information portions, and a subtype section unique for each record. The subtypes are:

Subtype 1 — ACCESS record. The ACCESS data section is written when a DIV object is accessed.
Subtype 2 — UNACCESS record. The counts for the I/O Activity Section are accumulated by data-in-virtual while the object is in use and are reported at the time of the UNACCESS request. The subtype 2 record is written whenever a data-in-virtual object is unaccessed.
Subtype 3 — collects virtual lookaside facility (VLF) statistics. It is written every 15 minutes. The data is repeated for each VLF class defined in the COFVLFxx parmlib member.

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SMF Type 41 Record -- DIV Objects and VLF Statistics
Offset (Dec.)	Offset (Hex)	Name	Length	Format	Description
0	0	SMF41LEN	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” on page 13-1 for a detailed description.
2	2	SMF41SEG	2	binary	Segment descriptor (see record length field).
4	4	SMF41FLG	1	binary	System indicator: Bit Meaning When Set 0 Subsystem identification follows system identification 1 Subtypes used 2 Reserved 3-6 Version indicators* 7 Reserved.*See “Standard SMF Record Header” on page 13-1 for a detailed description.
5	5	SMF41RTY	1	binary	Record type 41 (X'29').
6	6	SMF41TME	4	binary	Time since midnight, in hundredths of a second, when the record was written.
10	A	SMF41DTE	4	packed	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.
14	E	SMF41SID	4	EBCDIC	System identification (from the SID parameter).
18	12	SMF41SSI	4	EBCDIC	Subsystem identification (EBCDIC blanks).
22	16	SMF41STY	2	binary	Record subtype Value Meaning 1 ACCESS 2 UNACCESS 3 VLF statistics.
24	18	SMF41TRP	2	binary	Number of triplets. A triplet is a set of offset/length/number values that defines a section of the record.
26	1A	SMF41xxx	2	--	Reserved.
28	1C	SMF41OPD	4	binary	Offset to product section.
32	20	SMF41LPD	2	binary	Length of product section.
34	22	SMF41NPD	2	binary	Number of product sections.
36	24	SMF41OD1	4	binary	Offset of object ACCESS data section.
40	28	SMF41LD1	2	binary	Length of object ACCESS data section.
42	2A	SMF41ND1	2	binary	Number of object ACCESS data sections.
44	2C	SMF41OD2	4	binary	Offset of object UNACCESS data section.
48	30	SMF41LD2	2	binary	Length of object UNACCESS data section.
50	32	SMF41ND2	2	binary	Number of object UNACCESS data sections.
52	34	SMF41OD3	4	binary	Offset of I/O activity section.
56	38	SMF41LD3	2	binary	Length of I/O activity section.
58	3A	SMF41ND3	2	binary	Number of I/O activity sections.
60	3C	SMF41OD4	4	binary	Offset to the VLF statistics section.
64	40	SMF41LD4	2	binary	Length of the VLF statistics section.
66	42	SMF41ND4	2	binary	Number of VLF statistics sections.
Product Section(Offset from beginning of record: SMF41OPD)
0	0	SMF41PL	8	EBCDIC	Product level.
8	2	SMF41PN	16	EBCDIC	Product name (‘DATA-IN-VIRTUAL’).
Object ACCESS Data Section This section is present for record subtypes 1 and 2 only.(Offset from beginning of record: SMF41OD1)
0	0	SMF41DDA	8	EBCDIC	Object data definition name (ddname).
8	8	SMF41AZA	4	binary	Object size, in units of blocks, when accessed.
12	C	SMF41ATA	4	binary	Time since midnight, in seconds, when the object was accessed.
16	10	SMF41TYA	1	binary	Object type Code Meaning 1 DA.
17	11	SMF41AMA	1	binary	ACCESS mode Code Meaning 1 Read 2 Update.
18	12	SMF41JBN	8	EBCDIC	Job name (initiator or started task).
Object UNACCESS Data Section This section is present for record subtype 2 only.(Offset from beginning of record: SMF41OD2)
0	0	SMF41UZU	4	binary	Object size, in units of blocks, when unaccessed.
4	4	SMF41UTU	4	binary	Time since midnight, in seconds, when the object was unaccessed.
Object I/O Activity Section This section is present for record subtype 2 only(Offset from beginning of record: SMF41OD3)
0	0	SMF41BRD	4	binary	Total reads, including re-reads (number of blocks read from object).
4	4	SMF41BWR	4	binary	Total writes (number of blocks written to object).
8	8	SMF41BRR	4	binary	Total re-reads (number of blocks re-read from object).
12	C	SMF41NC	4	binary	Total I/O calls for reads.
16	10	SMF41OUC	4	binary	Total I/O calls for writes.
VLF Statistics Section This section is present for record subtype 3 only.(Offset from beginning of record: SMF41OD4)
0	0	SMF41CLS	8	EBCDIC	Class name.
8	8	SMF41MVT	4	binary	MAXVIRT specified, in 4K blocks. MAXVIRT is a VLF parameter specified in the COFVLFxx parmlib member.
12	C	SMF41USD	4	binary	Amount of virtual storage currently being used, in 4K blocks.
16	10	SMF41SRC	4	binary	Number of times the cache was searched in this interval.
20	14	SMF41FND	4	binary	Number of objects found in the cache in this interval.
24	18	SMF41ADD	4	binary	Number of objects added to the cache in this interval.
28	1C	SMF41DEL	4	binary	Number of objects deleted from the cache in this interval.
32	20	SMF41TRM	4	binary	Number of objects trimmed from the cache in this interval.
36	24	SMF41LRG	4	binary	Largest object attempted to put in the cache.

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

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SMF Type 41 Record

This table shows the record layout for type 41 SMF records (DIV Objects and VLF Statistics).

It's easy to report on SMF 41 data!

This table shows the record layout for type 41 SMF records
(DIV Objects and VLF Statistics).