I'm no expert, but we discovered when we used EXT that we could not use SMS DSS
(ADRDSSU) to backup the file, because apparently DSS uses EXCP I/O (or
something), and EXT does not support EXCP. Or something like that.
--
Frank Swarbrick
Applications Architect - Mainframe Applications Development
FirstBank Data Corporation - Lakewood, CO USA
P: 303-235-1403
On 4/20/2011 at 4:43 AM, in message <201104201843362657...@163.com>, ibmnew
<ibm...@163.com> wrote:
> 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".
>>>
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