Yes, it is PARTIALLY documented.
The token is one of IBM secrets I want to explain.
However to correct:
4000 Generic token - good old compression
6x00 Tailored token
6001 zEDC token - this is zEDC!
8000 Rejection token - compression disabled, likely because of lack
of effects.
So, 6001 is the eye-catcher.
Fine print disclaimer: this is knowledge valid for z14. However z15
changed EDC hardware, so maybe token has changed as well. Did I say it
is undocumented?
--
Radoslaw Skorupka
(looking for new job)
Lodz, Poland
W dniu 11.04.2021 o 23:37, Mike Hochee pisze:
Interesting!
Thank you!
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of Farley, Peter x23353
Sent: Sunday, April 11, 2021 5:22 PM
To: [email protected]
Subject: Re: How to tell if zEDC is active for an LPAR or DASD pool
Caution! This message was sent from outside your organization.
We're currently on z13's. We were advised by IBM sources to look for this in a
LISTCAT ALL of a sequential file to tell if it was zEDC compressed or not:
ACT-DIC-TOKEN----X'600100000004000000000000000000000000000000000000000000000000000000000000'
We were told that the "60" at the start of that value is the sign that zEDC was
used.
Peter
-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of
Mike Hochee
Sent: Saturday, April 10, 2021 10:08 PM
To: [email protected]
Subject: Re: How to tell if zEDC is active for an LPAR or DASD pool
I know how to check with LISTCAT whether a file WAS compressed via zEDC, but I
would like to know how to tell whether or not it WILL be used when creating a
new file in a given DASD pool.
It depends on whether you are running on a z15 or not, and if not, the values
in effect for the DEFMINREQSIZE and INFMINREQSIZE. Check out IQPPRMxx in the
Inititialization and Tuning Reference.
HTH,
Mike
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf
Of Radoslaw Skorupka
Sent: Saturday, April 10, 2021 8:34 PM
To: [email protected]
Subject: Re: How to tell if zEDC is active for an LPAR or DASD pool
Caution! This message was sent from outside your organization.
W dniu 10.04.2021 o 19:48, Farley, Peter x23353 pisze:
Just a question of curiosity: Is it possible to tell if zEDC compression is
active for an LPAR or for a particular DASD pool? Perhaps an ISMF screen?
I know how to check with LISTCAT whether a file WAS compressed via zEDC, but I
would like to know how to tell whether or not it WILL be used when creating a
new file in a given DASD pool.
IMHO it is matter of Data Class and ACS.
I don't consider ADRDSSU dump files which can be compressed or copies of
existing compressed datasets.
HTH
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