W dniu 24.10.2025 o 17:45, Colin Paice pisze:
I'm about to set up some new ZFS data sets
Is there any guidance on the best way of doing it?
- My DEFINE cluster has LINEAR - but I see there is a ZFS option. Does it
really make a difference?
- My template JCL has "-compat" in it. Is this recommended ?
Are there any performance options I should be enabling?
1. You have to allocate/create VSAM dataset.
2. The dataset is LINEAR aka LDS. For yeaaaars it was LINEAR. However at
the time of z/OS 2.1 (or so) new parameter was created - you can use ZFS
instead of LINEAR. You can but you still may use LINEAR as well.
3. Difference? For non-SMS managed ZFS datasets you will get Extended
Addressability. Yes, non extended format ZFS can be EA.
4. Formatting. ZFS or LINEAR - you still have to format it.
5. Features? Like compress or encrypt.
6. -compat - it is *the only* option so you don't have to specify it. At
the beginning of ZFS it was possible to create ZFS dataset with multiple
filesystems inside, independent, mounted separately. Something like
multiple tables in DB2 tablespace. But it is no longer supported.
HTH
Regards
--
Radoslaw Skorupka
Lodz, Poland
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