Hi Radek,
- Run ICKDSF to take the VTOC out of Indexed Format (BUILDOS)
- ZAP the VTOC  (i.e. FORMAT4.DSCB) to change the DSNAME to something innocuous.
- Compress via IEBCOPY
- ZAP the DSNAME to SYS1.LINKLIB
- Run ICKDSF to put the VTOC into Indexed Format (BUILDIX)

I've done this, but, not recently.

Here is an article where someone else came up with the same idea:
Deleting a File That Is “In Use” | Steve Baugh - The CICS Guy (wordpress.com) <https://thecicsguy.wordpress.com/2009/06/19/deleting-a-file-that-is-in-use/>

Regards,
David

On 2024-01-19 07:27, Radoslaw Skorupka wrote:
I want to compress some system datasets like SYS1.LINKLIB, but *not* real "live", rather offline copies.
DSS ends with RC8, because of failed serialization.
SETPROG LNKLST,UNALLOCATE will not solve all the enqueues, because some datasets are serialized by other entities like TSO users.

And I also want to CONSOLIDATE some datasets as well.


Any clue?


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