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I tried that, but had two problems:

When migrating a VM from one host to another it would require cloning the LVM volume, rather than just importing the group on the other node and starting the VM up.

I have existing VMware gusts that I'd like to migrate over in bulk. This would be easy enough to do by converting the VMDK files, but using LVM means creating an LVM group for each VM and importing the contents of the VMDK into the LV.

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Hmm, staying with iSCSI. You should create one large LUN that is available on each node. Then it is important to mark the LVM as "shared". This way, PVE knows that all nodes access the same LVM, so copying the disk images is not necessary on a live migration.

With such a setup, PVE will create LVs on the same VG for each disk image. So no handling of multiple VGs or LUNs is necessary.

The multipathing PVE wiki page lines out the whole process: https://pve.proxmox.com/wiki/Multipath

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