z/OS V1R8 DFSMS Technical Update - IBM Redbooks

In Figure 3-21 we show the JCL to extract the SMF records and run the program.
Note: This JCL assumes that an extract is being taken from the active SMF data set, which
is then passed to the SMFT42TG program. The JCL could be changed to make a
permanent extract of the SMF data, or to read of an already created SMF data extract.
//MHLRES1L JOB (999,POK),MSGLEVEL=1,NOTIFY=MHLRES1
// EXEC PGM=IFASMFDP
//SYSPRINT DD SYSOUT=*
//DUMPIN DD DISP=SHR,DSN=SYS1.SC64.MAN2
//*DUMPIN DD DISP=SHR,DSN=SMFDATA.ALLRECS.G3196V00
//OUTDD DD DSN=&SMFT85,
// SPACE=(CYL,(10,5)),
// RECFM=VB,LRECL=32760,
// DISP=(,PASS,DELETE),
// UNIT=SYSDA
//SYSIN DD *
INDD(DUMPIN,OPTIONS(DUMP))
OUTDD(OUTDD,TYPE(42(16)))
/*
// EXEC PGM=SMF42TG
//STEPLIB DD DISP=SHR,DSN=MHLRES1.SMF42TG.LOAD
//SYSUDUMP DD SYSOUT=A
//SMFIN DD DISP=SHR,DCB=BFTEK=A,
// DSN=&SMFT85
//PRINT DD SYSOUT=A,RECFM=UA
Figure 3-21 JCL to extract SMF records and run program SMF42TG
Note: As a result of the problems described by APAR OA17704 (see “OA17704” on
page 456) there may be abnormal displays in the output. The fact that a record is not
correctly built in the SMF records is usually indicated by the cycle time records being zero
or abnormally large.
There are four sets of records contained in the SMF records type 42 subtype 16, two sections
relating to below the 2 GB bar and two relating to above the 2 GB bar. Hence, a large amount
of output could be produced. Samples of each type of output are presented from a run of the
program. The ability to use buffers above the 2 GB bar was made available with z/OS V1R7,
but the SMF data about activity was not available until z/OS V1R8.
Program SMF42TG output uses headings for the output that are taken from the SMF records
that it was obtained from. To assist with interpretation of the output, we provide extracts from
parts of the SMF mapping macro IGWSMF. In order to distinguish between the SMF record
type 42 subtype 16 fields from below and above the 16 GB bar, those relating to below the
2 GB bar are prefixed SMF42, and those relating to above the 2 GB bar are prefixed SMF2A
(2A is hexidecimal for 42).
The records (in each group) consist of SYSPLEX-wide data and Data set/MVS system
summary data.
Chapter 3. DFSMSdfp V1R8 enhancements 31