Comment 8 for bug 1414527

I recently hit this when switching storage drivers - particularly from a single path driver to a multi path driver, and the cause seems to have only been LVM. I had previously specified the prior iSCSI system via /etc/lvm/lvm.conf in global_filters, but I missed added the multipath devices to global_filters. The result was that LVM on the hypervisor was seeing LVM-based guest volumes. After adding the multipath devices to global_filters and cleaning up the mess via dmsetup, the problem seems resolved. So, I don't think this is specifically an os-brick issue unless os-brick can block LVM activation on the host for guest volumes on a case-by-case basis, rather than as a global filter.