Hi,
We had a production job that was canceled after 8 hours in the machine,
during month end processing.
Here is what the job was doing :
DUMP DATASET(INCLUDE(HW*.**)
BY((DSORG NE VSAM))
EXCLUDE(HWAT.**,HW%C.**,HW%D.**,HW%I.**,HW%Q.**,
HW%S.**,HW%U.**,HW%V*.**,HW%Z.**,**.TEMP.**,
**.EDWXTRCT.**,**.TEMP%,HWP.HWPEIDCM.EA*.**,
HWF.FEDOFF.**,HWF.HWFFSORT.**,HWF.HWFISORT.**,
HWF.HWFFIDCM.HWFF5*.**,HWF.HWFIIDCM.FTO*,
HWF.HWFI598P.**,HWF.HWFI600P.**,
HWL.HWLV740P.IRSREPT*,HWL.HWLVF%P.IPREOFF*, -
HWL.HWLVF35P.**,HWJ.HWJEIDCM.BKUP.**))
OUTDDNAME(OFFSITE,ONSITE)
TOLERATE(ENQF) OPTIMIZE(4)
CONCURRENT SHARE SPHERE
Summary:
We did receive CA Sysview warning messages for this job as follows :
23:42:30.05 P1 S2279 00000094 GSVX321W (MVSDATA) Threshold JOB
JOBIOR HWGGBK2P PROBLEM V=210.7 W=75.00
P=100.0
00:00:30.08 P1 S2279 00000094 GSVX321W (MVSDATA) Threshold JOB
JOBIOR HWGGBK2P PROBLEM V=249.5 W=75.00
P=100.0
Conclusion :
Would it be reasonably to make the following changes to the control cards :
Suggested changes to avoid a SURGE in REAL/VIRTUAL storage use :
- Remove CONCURRENT
- Change OPTIMIZE to OPTIMIZE(3)
Explanation for :
a) CONCURRENT :
Attention: Performing concurrent copy operations against many large data
sets when there is also heavy update activity (such as reorganizing data sets
or initializing the volume the data sets reside on) can result in a shortage of
storage. The shortage occurs because data is transferred to data-space
storage faster than DFSMSdss can process it.
b) OPTIMIZE specifies the number of tracks to be read at a time, as follows:
If n is 1, DFSMSdss reads one track at a time.
If n is 2, DFSMSdss reads two tracks at a time.
If n is 3, DFSMSdss reads five tracks at a time.
If n is 4, DFSMSdss reads one cylinder at a time.
If OPTIMIZE is not specified, OPTIMIZE (1) is the default. Specifying OPTIMIZE
(2), (3), or (4) reduces the time for a dump. Notice that this keyword uses
more real and virtual storage. It also keeps the channel busy for longer blocks
of time.
Anton Britz
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