Gibney, David Allen,Jr wrote:

>   I have a small shop, 4 monoplex LPARs, no GRS. Very careful sharing of a 
> limited set of disks including the system resident (IPL) volume, a Mod-27. Up 
> until now, I have made separate (R/O) copies of the ROOT and other system 
> ZFS/HFS(s) for each LPARs.
>   This new Unix filesystem with FONTS is not small and I am wondering if it 
> is  safe to have only one (R/O) copy of it (probably on the IPL volume), 
> shared by two or more LPARs?

That's possible (sharing of IPL volser) as long all those LPARS are on the same 
z/OS level.

>   My SMP/E points to an entirely separate target Mod 27 and set of OMVS 
> files. These are cloned after maintenance to alternating IPL and maintenance 
> level OMVS files.

What is your catalog setup? Do you have separate master catalogs and their own 
set of user catalogs? Or are you sharing your catalogs?

I believe it is safe to share a Read Only OMVS dataset, unless you have 
something to prevent sharing of such OMVS datasets, for example having a folder 
which is written to. 

Of course, moving from z/OS v1.13 to 2.1 requires two different IPL volsers 
during rolling upgrades.

Groete / Greetings
Elardus Engelbrecht

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