Dear
DSNTYPE=LARGE: The data sets are large format sequential data sets
DSNTYPE=EXT:no track limitation
Q1:What's the differences between DSNTYPE=EXT and DSNTYPE=LARGE for large PS?
Q2:Could DSNTYPE=EXT replace DSNTYPE=LARGE ?
Q3:Ours shop is z/OS 1.11, Every PS should now benefits from EF,Could I assign
every PS to use EF including small and large PS?
Q4 Is there any disadvantage for EF?
Thanks a lot!
Best Regards,
Jason Cai
64k TRACK limitation, striping, maximum number of extents per volumes
(16 vs 123), compression.
The above are "visible" differences.
Peter mentioned assembler macros. (Thank you for the clarification!)
Depending on your z/OS release EF-PS can reside in EAS ("big" part of
EAV), but AFAIK in 1.12 non-EF PS is also allowed for it.
There are also differences on very low-level operations, which are
usually invisible and unavailable for "regular application user".
--
Radoslaw Skorupka
Lodz, Poland
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