ABCs of z/OS System Programming Volume 3 - IBM Redbooks

► Capacity planning: Capacity planning for DFSMShsm-managed data (inactive data
management) includes the collection of both DASD and tape capacity planning.
– DASD Capacity Planning: DCOLLECT provides information and statistics for volumes
managed by DFSMShsm (ML0 and ML1).
– Tape Capacity Planning: DCOLLECT provides statistics for tapes managed by
DFSMShsm.
► SMS configuration information: DCOLLECT provides information about the SMS
configurations. The information can be from either an active control data set (ACDS) or a
source control data set (SCDS), or the active configuration.
Data is gathered from the VTOC, VVDS, and DFSMShsm control data set for both managed
and non-managed storage. ISMF provides the option to build the JCL necessary to execute
DCOLLECT.
DCOLLECT example
With the sample JCL shown in Figure 4-25 you can gather information about all volumes
belonging to storage group STGGP001.
//COLLECT2 JOB ...
//STEP1 EXEC PGM=IDCAMS
//SYSPRINT DD SYSOUT=A
//OUTDS DD DSN=USER.DCOLLECT.OUTPUT,
// STORCLAS=LARGE,
// DSORG=PS,
// DCB=(RECFM=VB,LRECL=644,BLKSIZE=0),
// SPACE=(1,(100,100)),AVGREC=K,
// DISP=(NEW,CATLG,KEEP)
//SYSIN DD *
DCOLLECT -
OFILE(OUTDS) -
STORAGEGROUP(STGGP001) -
NODATAINFO
/*
Figure 4-25 DCOLLECT job to collect information about all volumes in on storage group
Many clients run DCOLLECT on a time-driven basis triggered by automation. In such a
scenario, the peak hours should be avoided due to the heavy access rate caused by
DCOLLECT in VTOC and catalogs.
136 ABCs of z/OS System Programming Volume 3