Might you have a LISTCAT ALL for these two files? I't would be good
to get more detailed information on the compression. Rather looks
like zEDC did not get used on both of these.
At 03:40 PM 7/22/2021, PINION, RICHARD W. wrote:
z13 created dataset LISTC & DCB,
STATISTICS
USER-DATA-SIZE----------------------------27761896449
COMP-USER-DATA-SIZE------------------------2689053885
SIZES-VALID--------(YES)
Management class . . : MC1GEND Allocated cylinders : 3,170
Storage class . . . : STANDARD Allocated extents . : 1
Volume serial . . . : TL0018
Device type . . . . : 3390
Data class . . . . . : COMP
Organization . . . : PS Current Utilization
Record format . . . : VB Used cylinders . . : 3,170
Record length . . . : 23552 Used extents . . . : 1
Block size . . . . : 23556
1st extent cylinders: 3170
Secondary cylinders : 250 Dates
Data set name type : EXTENDED Creation date . . . : 2021/07/01
Referenced date . . : 2021/07/22
Expiration date . . : ***None***
SMS Compressible . : YES
Extended Attributes NO
z15 created dataset LISTC & DCB
STATISTICS
USER-DATA-SIZE----------------------------27761896449
COMP-USER-DATA-SIZE------------------------3629379499
SIZES-VALID--------(YES)
Management class . . : MC1GEND Allocated cylinders : 4,279
Storage class . . . : STANDARD Allocated extents . : 11
Volume serial . . . : PL0024 +
Device type . . . . : 3390
Data class . . . . . : COMP
Organization . . . : PS Current Utilization
Record format . . . : VB Used cylinders . . : 4,279
Record length . . . : 23552 Used extents . . . : 11
Block size . . . . : 23556
1st extent cylinders: 150
Secondary cylinders : 99 Dates
Data set name type : EXTENDED Creation date . . . : 2021/07/22
Referenced date . . : 2021/07/22
Expiration date . . : ***None***
SMS Compressible . : YES
Extended
Attributes NO
-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On
Behalf Of Chuck Kreiter
Sent: Thursday, July 22, 2021 4:34 PM
To: [email protected]
Subject: Re: zEDC compression on z13 and z15
[External Email. Exercise caution when clicking links or opening attachments.]
We went from z14 to z15's and didn't notice any difference in compression.
I would be curious to see listcat of both showing the user data size
and the comp data size as well as the dataset DCB attributes.
-----Original Message-----
From: IBM Mainframe Discussion List
[mailto:[email protected]] On Behalf Of PINION, RICHARD W.
Sent: Thursday, July 22, 2021 3:55 PM
To: [email protected]
Subject: zEDC compression on z13 and z15
We migrated from a z13 to a z15 this past weekend. We are running
z/OS 2.2, z/OS 2.2 on the z13, and the same z/OS 2.2 on the
z15. z15 maintenance was applied to z/OS 2.2, and activated a
couple of months ago. We are using the same SMS configuration on
the z15 as the z13, and that includes the zEDC compression Data Class.
I restored a dataset that was created on the z13 using zEDC
compression, and needed to make a copy of the dataset on the z15. I
was surprised to see an almost 20,000 track difference between the
z13 created dataset, and the z15 created dataset. I used the same
SMS Data Class to make the z15 version of the dataset.
Enter "/" to select action Tracks %Used
------------------------------------------------------------------------
Z13.CREATED.DATA.SET 47550 99
Z15.CREATED.DATA.SET 64555 100
SMS allocation messages for the z15 created dataset follows.
IGD17070I DATA SET Z15.CREATED.DATA.SET
ALLOCATED SUCCESSFULLY WITH 1 STRIPE(S).
IGD17160I DATA SET Z15.CREATED.DATA.SET
IS ELIGIBLE FOR COMPRESSION
IGD101I SMS ALLOCATED TO DDNAME (SYSUT2 )
DSN (Z15.CREATED.DATA.SET)
STORCLAS (STANDARD) MGMTCLAS (DE180DAY) DATACLAS (COMP)
VOL SER NOS= TL0018
I have not looked into the TCB/SRB I/O numbers of the
z13 creating job to compare against the z15 job.
Anyone have an idea as to why such a dramatic difference?
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