Re: [libvirt-users] for a guest accessing host "full disk", how to prevent host vgscan

Hi All. I have a dell system with a H700 raid. Within the hardware RAID config I've created a "virtual disk" which I have assigned to one of my guests. On the host the device is "/dev/sdb", on the guest it's "/dev/vdb". This works fine. Within the guest, we have created lvm PV on /dev/vdb (using the whole disk - no partitions) and created a volume group. The guest's hostname is "argo" and the vg is called "vg_argo_bkup". When I reboot the host, it does a vgscan and finds the volume group and activates it in the _host_, which I need to prevent (I think??). I have successfully done this by filtering "/dev/sdb" in /etc/lvm/lvm.conf (which does NOT work as advertised BTW), but referencing the extremely volatile SCSI "sd*" names seems a terrible way to do this. If I fiddle around in the HW raid config, the /dev/sd? may change. I plan on creating about 10 more VM's spread over a number of machines over the next weeks with a very similar setup, and the admin overhead seems like it'll be onerous and error-prone. I'd love to be able to filter the volume groups by VG name instead of pv device node. The host's hostname is "narnia" and I'd love to say, 'vgscan --include-regex "vg_narnia.*"' or something similar, if you get my drift. Does anyone have a best practice for this? I'm sure iSCSI enthusiasts must have the exact same issue all the time.