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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