Repro jobs running longer under VAM.

Document ID : KB000113185
Last Modified Date : 05/09/2018
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Introduction:
This problem is caused by a few things that came together in this one job...
 - The allocation amounts were quite small.
 - EOV_VSAM was invoked frequently.
 - A large number of volumes were defined as candidates.
Question:
We have some jobs REPROing large VSAM files that when running under VAM are taking much longer during EOV processing.
Same jobs running where VAM is bypassed run much faster.
Answer:
When Vkgparm PLSOPT24 (Y) was specified, the job runtime was equivalent to when VAM was bypassed.
PLSOPT24
N (default) - Launch EOV_VSAM even if candidate is available.
Y - Prevent launching EOV_VSAM when a candidate volume is available.