Hi,
I really don't recommend using LVM on shared storage (iscsi, fc etc.) without using CLVM. My cluster was up for 90 days, during that I've created many new kvm virtual machines, after live migrating one machine that was created recently it crashed, I've restarted it and I got different virtual machine booting up, after moving my virtual machine back to original host it booted ok so I guess that there has been some differences in how host sees lvm metadata. I've made backup of all my virtual machines, shut down iscsi, setup clvm and set my iscsi volume group to be clustered, 3 virtual machines were lost because after restarting iscsi lvm volumes they where using was empty (no partitions or bad partition table). If anyone is using LVM on top of shared storage please backup everything and setup clvm.
I really don't recommend using LVM on shared storage (iscsi, fc etc.) without using CLVM. My cluster was up for 90 days, during that I've created many new kvm virtual machines, after live migrating one machine that was created recently it crashed, I've restarted it and I got different virtual machine booting up, after moving my virtual machine back to original host it booted ok so I guess that there has been some differences in how host sees lvm metadata. I've made backup of all my virtual machines, shut down iscsi, setup clvm and set my iscsi volume group to be clustered, 3 virtual machines were lost because after restarting iscsi lvm volumes they where using was empty (no partitions or bad partition table). If anyone is using LVM on top of shared storage please backup everything and setup clvm.