Hi all,
We are currently an exclusively z/OS site with multiple LPARs sharing a
single IOCDS and DASD farm. We are about to install z/VM in a new LPAR and I'm
worried about both OSs sharing the same DASD farm. They will not be sharing at
the volume level.
I've read through the install doc and it all seems fine, you tell the install
process 6 or 9 unit adresses and it goes and loads stuff onto them and then you
IPL. There is no mention of modifying other volumes, however there are include
and exclude unit address lists that you can specify to define what z/VM will
try to look at, which presumably you can't get at until after the basic install
and IPL. Also z/VM can issue sense commands to determine what devices are out
there.
The reason I'm worried is that in a previous life, over 30 years ago, my
previous company attempted to do the same between an VM system and a DOS/VSE
system. This was a long time ago on a real machine in pre LPAR days.
When they brought up VM for the first time it objected to the VSE VTOCs it
found and rewrote them as OS VTOCs and we lost the whole DASD farm. Management
were not best pleased. I wasn't directly involved at that time so I'm not 100%
sure of my facts here and perhaps the guys who did this did something wrong,
however my worry still remains.
My question is - Do we have to isolate z/VM from the z/OS volumes or will z/VM
play nice and leave stuff alone?
I just want to double check that VM will only touch the 6 volumes it is given
at install time.
Regards, Ron MacRae.
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