With CSE you can share the Mdisk without problem. CSE guarantee the
integrity.
I work with this for years: four zVM 4.4 into a "VMPlex", no zOS, with a
unique RACF DB (and a unique DIRMAINT with 3 Satellites).
Without CSE I didn't test any shared VM...
Regards, Clovis.
From: Eginhard Jaeger <[email protected]>
To: [email protected]
Date: 28/07/2010 10:55
Subject: Re: Installing RACFVM - Questions
Sent by: The IBM z/VM Operating System <[email protected]>
Is that really true? When checking just now I found that the 'Planning
and Administration' manual also says so, but I'm 99% sure (allowing
1% for memory deterioration) that I shared a 20 cyl. RACF database
between two separate VM XA systems and it worked perfectly well.
While the rest of the packs certainly shouldn't be used for any high
activity stuff I believe we did actually use it (space was still quite
expensive 20 years ago).
So I suspect that the 'full pack' requirement may just come from sharing
DASD with non-VM systems, and that it doesn't really apply to the
RACF data base being shared between multiple VM systems only.
But I never had to share disks for later VM releases and so don't
know for sure ..
Eginhard Jaeger
>From: "Bruce Hayden" <[email protected]>
>
>That will not work. The database must be on full pack minidisks,
>which means the minidisk must start at cylinder 0 and go to the end of
>the volume. (DEVNO minidisks can also be used.) So, your directory
>entries must be:
>
>MDISK 200 3390 0 END VMRACP MWV READ WRITE MULT
>MDISK 300 3390 0 END VMRACB MWV READ WRITE MULT
>
>The devices must be defined in your SYSTEM CONFIG file as shared.
