Actually to z/OS IAM datasets look like physical
sequential. They look to the application like VSAM.
At 02:02 PM 4/16/2024, Jousma, David wrote:
Thanks for that. We do have IAM here, well
open a ticket with BMC asking about support. I
was just doubting since it presents to the OS as a VSAM dataset.
We were hoping to make ZEDC inclusive as in
everyone gets it to reap the space reduction,
and job performance improvements and that the OS
would decide for us if a particular dataset that
has the DATACLAS assigned to it would just ignore, but that wont be the case.
I have the ability to code ZEDC_preferred or
ZEDC-Required. Required will actually fail the
allocation, which I dont want to either, but I
also dont want to use non-accelerated compression either.
So, now as you pointed out, well have to
approach ZEDC as âexclusive and only opt-in
file types that are supported like GDGs for
sure. We may roll the dice on all PS,
exempting temp datasets and ISPF work datasets,
and more as we stumble upon other incompatibilities.
With knowing the technical details, I think IBM
missed the boat here. ZEDC ought to be a
drop-in replacement for compression, period. I
can specify COMPACTION YES for VSAM files but ZEDC wont touch them. Why?
Dave Jousma
Vice President | Director, Technology Engineering
From: IBM Mainframe Discussion List
<IBM-MAIN@LISTSERV.UA.EDU> on behalf of
rpinion865 <0000042a019916dd-dmarc-requ...@listserv.ua.edu>
Date: Tuesday, April 16, 2024 at 2:25â¯PM
To: IBM-MAIN@LISTSERV.UA.EDU <IBM-MAIN@LISTSERV.UA.EDU>
Subject: Re: Anyone exploiting ZEDC?
At my previous life, we were using BMC's IAM
VSAM interface. I think IAM could use zEDC. But
I was told by then IDP support, that IAM's
internal compression was Moe (as in Moe Howard)
better than even zEDC. Regarding coding for PS datasets
At my previous life, we were using BMC's IAM
VSAM interface. I think IAM could use zEDC. But
I was told by then IDP support, that IAM's
internal compression was Moe (as in Moe Howard) better than even zEDC.
Regarding coding for PS datasets opened in/out,
I think DAF will show how a PS dataset is being
opened. We chose to use zEDC compression for
new,catlg,delete GDGs because we were very
confident that no one was going to process that combination as in/out.
And does not the IBM zBNA tool highlight good
candidates? We did not want to clutter up our
SMS ACS DC routines with too many actions to put
certain PS datasets into zEDC compression. But
in the end, we did put certain large PS, not
opened in/out, datasets in the ACS DC routine.
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