We have a Zen 4.0.1 server that has most of the ZEN stuff installed on a
normal NSS volume (called ZEN). We have clustered that server with
another (via iscsi) and created a cluster volume called TZEN. We would
like to upgrade to Zen 6.5 and put it on TZEN. When we start the Zen
install, we add the virtual zen cluster server to the Server Selection
screen and choose the components to install, but when we get to the File
Installation Location screen the volume ZEN is listed and grayed-out so
we can't change it.

I've taken Marcus' suggestions from this earlier thread and deleted the
ZIS object. I've even gone so far as to unload the ZEN volume AND rename
the zenworks directories both off the root of sys and under public.
Yet the problem persists. Help! I'm just about ready to fdisk this
server and start over!