We are not using shared ZFS (or HFS for that matter). We merged three 
plexes into 1 a couple of years ago (for charging reasons), and we only share 
the minimum dasd to allow the plex to work (Couple/logger etc). All systems in 
the plex are in the same MII-plex, but have their own MAS, RACF d/b, SMS 
environment, Unix environment. We cannot use shared ZFS, as all systems 
need to have access to any datasetst that are shared and this is not how our 
dasd is setup. We are actively working toward a single RACF d/b, single JES 
environment but slowly!

The common MII environment means that we occaisionally get some false 
contention for same named datasets but is manageable. 

We never saw contention with HFS - I need to check the propogation of 
SYSZDSN in MII, but now we are seeing contention with ZFS - I assume a 
Vsam major name is getting propogated for ZFS when (perhaps) SYSZDSN was 
not - -need to check tomorrow.

That said, I can put a system name in the automount policy, but if a batch 
job runs on a different system it will store data into different datasets and 
therefore potentially not have the latest data.

e.g. job ABC runs with USER=DEF on system A and the automount causes ZFS 
file UNIX.SYSA.DEF to be mounted. If the job saves data in this ZFS and later 
runs on system B (which will mount UNIX.SYSB.DEF), it will not have the latest 
version of the data.

Andrew

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