You should evaluate the SMS and non-SMS breakpoint values to limit
the over allocation of small data sets in the cylinder-managed space
on backup, ML1, and ML2 extended address volumes. Depending on the
breakpoint value, over allocation might still occur for large data
sets, however, the percent of over allocation is small in comparison
to the total disk space request. Small data sets should be allocated
in track-managed space and large data sets allocated in cylinder-managed
space to limit over allocation. For more information, see the topic
about extended address volumes in z/OS DFSMS Using Data Sets.
EAVs configured as L0 volumes should not be used as a repository
for small data sets. Doing so will negatively impact performance.