Could you please explain exact user scenarios and user stories here. Is
this just a hypothetical use-case / testing or some real scenarios that
you have in mind.

In Ubuntu and Debian, in general we do not activate existing volume
groups and volumes, because the idea is that in general one installs
things afresh and doesn't reuse/resize existing things. Especially not
LVM groups. We even opportunistically wipe lvm metadata off the drives
before guided full disk install.

There is no current support in e.g. debian and ubuntu, to reuse lvm
groups and volumes per se.

There are a couple things we could do, but to get this right we'd want
to know why or how you are envisioning this to be used. In general, no
users share a volume group across multiple installs. So in various
scenarios, where one does and doesn't have existing volume groups, when
would you want to activate them and not, and why. And if we do activate
an existing volume group, how do you see it booting and where would the
zipl installation go? Do you expect it to install with guided partition?
and how? Please elaborate motivation behind activating existing volume
group from base principals.

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https://bugs.launchpad.net/bugs/1570580

Title:
  Existing Logical Volumes on multipathed SCSI disks are not
  automatically activated during installation

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