[linux-lvm] how to "ignore" a volume group created elsehwere on a shared device

["Brian J. Murrell" <brian@interlinx.bc.ca>]

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I have two machines connected to a shared storage device that I am
trying to use LVM2 with.

On one machine, /dev/sda1 is the same device (i.e. LUN on the shared
storage device) as /dev/sda2 on the other machine and vice versa.  To be
pedantically clear, machine one writes into /dev/sda1 and machine two
can see what was written by machine one in it's /dev/sda2.

The problem is that on machine one, if I add /dev/sda1 as a PV and then
create a VG on it, "automagically" machine two sees this same VG and a
PV in /dev/sda2.

Now while this has some very interesting "failover" benefits going for
it, it's lousing me up right now.

I want to be able to add /dev/sda1 as a PV on machine two and create VG
there of the same name as I used on machine one.  Of course LVM2 gets
upset that the VG exists already.

I have tried adding the device name I don't want to see the PV (and the
VG on it) on to the /etc/lvm/lvm.conf filter and while that prevents a
vgscan from scanning it, it still does not prevent pvdisplay from
listing it and the volume group on it from being visible.

Is there any way to do what I want?

b.


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