








	*SMF Tools*

SMF Type 99 Record - Subtype 4

This table shows the record layout for type 99 SMF records
(System Resource Manager (SRM) Decisions).

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

Purpose: This record type is written by the SRM component. The records contain:

Performance data for each service class period
Trace codes representing the SRM actions
The data which SRM used to decide which actions to take
The controls SRM is using to manage work.

In addition, subtypes 1 and 9 will be written by the SRM component when running in compatibility mode.

Record 99 has the following subtypes:

Subtype 1 Contains system level data, the trace of SRM actions, and data about resource groups. The SRM actions are recorded in trace codes. All trace codes are described in z/OS MVS Programming: Workload Management Services. A subtype 1 record is written every policy interval.

Subtype 2 Contains data for service classes. A subtype 2 record is written every policy interval for each service class if any period in the service class had recent activity.

Subtype 3 Contains service class period plot data. A subtype 3 record is written every policy interval for each service class if any period in the service class had recent activity and plot data.

Subtype 4 Contains information about a device cluster. A device cluster is a set of service classes that compete to use the same non-paging DASD devices. A subtype 4 record is written every policy interval for each device cluster in the system.

Subtype 5 Contains data about monitored address spaces. A subtype 5 record is written each policy interval for each swapped in monitored address space.

Subtype 6 Contains summary information about each service class period, including the resource control settings for the next policy interval. A subtype 6 record is written each policy interval.

Subtype 7 Contains summary information for the Enterprise Storage Server (ESS) with Parallel Access Volume (PAV) feature. A subtype 7 record is written every third policy interval.

Subtype 8 Contains summary information for LPAR CPU management. A subtype 8 record is written each policy interval, when in LPAR mode.

Subtype 9 Contains summary information for dynamic channel path management. A subtype 9 record is written each policy interval.

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SMF Type 99 Record -- System Resource Manager (SRM) Decisions
Offset (Dec.)	Offset (Hex)	Name	Length	Format	Description
0	0	SMF99S4_ LEN	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	SMF99S4_ SEG	2	binary	Segment descriptor (see record length field).
4	4	SMF99S4_ FLG	1	binary	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.
5	5	SMF99S4_ RTY	1	binary	Record type 99
6	6	SMF99S4_ TME	4	binary	Time since midnight, in hundredths of a second, that the record was moved into the SMF buffer.
10	0A	SMF99S4_ DTE	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	0E	SMF99S4_ SID	4	EBCDIC	System identification (from the SID parameter).
18	12	SMF99S4_ SSID	4	EBCDIC	Sub system identification
22	16	SMF99S4_ TID	2	binary	Record subtype (must be at offset X'16' x).
24	18	SMF99S4_ SDEF_ LEN	4	binary	Length of the self definition section.
Self-Defining Section(Offset from beginning of record: 28)
0	0	SMF99S4_ POF	4	binary	Offset to the product section from the beginning of the record (including RDW).
4	4	SMF99S4_ PLN	2	binary	Length of the product section.
6	6	SMF99S4_ PON	2	binary	Number of the product section.
8	8	SMF99S4_ DOF	4	binary	Offset to data section from beginning of the record (including RDW).
12	C	SMF99S4_ DLN	2	binary	Length of the data section.
14	E	SMF99S4_ DON	2	binary	Number of the data section.
SMF 99 Product Information(Offset from beginning of record: SMF99S4_POF)
0	0	SMF99S4_ VN2	2	binary	Record sub-version. Use to identify changes to the record in the service stream.
2	2	SMF99S4_ RVN	2	binary	Record version number.
4	4	SMF99S4_ PNM	8	EBCDIC	Product name - SRM
12	C	SMF99S4_ SLV	8	EBCDIC	System level from which record was cut (Copied from CVTPRODN).
20	14	SMF99S4_ SNM	8	EBCDIC	System name from which record was cut (Copied from CVTSNAME)
28	1C	SMF99S4_ PFLG	1	binary	Record Flags: Bit Meaning When Set 0 Only a subset of the available data was written to avoid that this record gets larger than 32 KByte 1 Only a subset of the available data is written to this record. The rest follows in subsequent records. This record contains a reassembly area. 2–7 Reserved.
29	1D	--	3	EBCDIC	Reserved.
Subtype 4 - Self Defining Section(Offset from beginning of record: SMF99S4_DOF)
0	0	SMF994DEVCLID	4	binary	Identifier of the device cluster. Used to associate a device cluster with the periods in a device cluster through the device cluster identifier field in the subtype 2 record (SMF99_PDEVCL).
4	4	SMF994IOPTOF	4	binary	Offset to the I/O priority table information from the beginning of the record (including RDW).
8	8	SMF994IOPTLN	2	binary	Length of the I/O priority information.
10	A	SMF994IOPTON	2	binary	Number of priority table sections.
12	C	SMF994IOPLTOF	4	binary	Offset to the I/O plot section from the beginning of the record (including RDW).
16	10	SMF994IOPLTLN	2	binary	Length of the I/O plot section.
18	12	SMF994IOPLTON	2	binary	Number of I/O plot sections.
Subtype 4 - Device Cluster Priority Table Section(Offset from beginning of record: SMF994IOPTOF)
0	0	SMF99_ IPTPRTY	2	binary	I/O priority.
2	2	SMF99_ IPTNP	2	binary	New I/O priority (zero if not changed)
4	4	SMF99_ IPTIMDP	4	binary	Initial maximum percentage of time that work at priority could demand I/O, initial value before any priority moves. Percentage scaled by 10.
8	8	SMF99_ IPTPMDP	4	binary	The projected maximum percentage of I/O time demanded at priority.
12	C	SMF99_ IPTW2UR	4	binary	The ratio of I/O wait to I/O using time scaled by 16.
16	10	SMF99_ IPTIMAXD	4	binary	The initial cumulative maximum demand percentage scaled by 10.
20	14	SMF99_ IPTWMAXD	4	binary	The projected cumulative maximum demand percentage scaled by 10.
Subtype 4 - I/O Plot Information Section(Offset from beginning of record: SMF994IOPLTOF)
0	0	SMF99_ IO_ PLOT_ BW	4	binary	Bucket width.
4	4	SMF99_ IO_ PLOT_ LSTX	4	binary	Last plotted x bucket.
8	8	--	4	binary	Reserved.
12	C	SMF99_ IO_ PLOT_ POINTS_ OF	4	binary	Offset of the point entries.
16	10	SMF99_ IO_ PLOT_ POINTS_ ON	2	binary	Number of point entries.
18	12	SMF99_ IO_ PLOT_ POINTS_ LN	2	binary	Length of a point entry.

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 99 Record - Subtype 4

This table shows the record layout for type 99 SMF records (System Resource Manager (SRM) Decisions).

It's easy to report on SMF 99 data!

This table shows the record layout for type 99 SMF records
(System Resource Manager (SRM) Decisions).