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Status Future consideration
Workspace WebSphere Liberty
Created by Guest
Created on Sep 23, 2021

Liberty on z/OS - Reduce the size of the SMF 120 subtype 11 User Data section when there is only 1

Today the SMF 120 subtype 11 record is approximately 630 bytes. When a customer or program product writes to the User Data section then the record grows in size by 4.5x as the User Data section has a fixed length of 2048 bytes regardless of how much data is actually written to it.

This allows someone processing the SMF 120 subtype 11 record to process the User Data sections in the record as SM120BAJ will be 2048 and SM120BAK will contain the number of sections.

However, when there is only 1 User Data section (SM120BAK=1 - which is most of the time), this approach can be improved by setting SM120BAJ to be the exact length of the User Data written to the record and not padding the data with nulls up to 2048 bytes.

Idea Priority Medium
Why is it useful?

As Liberty writes an SMF 120 subtype 11 record for every request it processes, this will massively reduce the amount of null data being written to the SMF datasets or log streams when the User Data section is being used.

Who would benefit from this IDEA? Liberty for z/OS customers