John, On 24/11/15 16:49, John Stoffel wrote: > Can I make a suggestion to you? Instead of trying to do the mirroring > in LVM, build yourself an MD mirror, then layer LVM ontop of that > instead. You get nice seperation. > > You can also take that /dev/sdb3, make it into an MD RAID1 array with > just one device, add it into the VG, then move the LVs onto the new > device. Once that's done, you remove the sda3 from the VG, then add > it into the MD device. Something like this... > >> mdadm --create /dev/md1 --level=1 --raid-devices=2 /dev/sdb3 missing >> cat /proc/mdstat >> pvcreate -v /dev/md1 >> vgextend -v vg0 /dev/md1 >> pvmove -v sda3 >> vgreduce -v vg0 sda3 >> mdadm --add /dev/md0 /dev/sda3 >> cat /proc/mdstat > > And you will now be mirrored, etc. Thanks for your suggestion which I have now implemented. The pvmove took a few hours (1.5TB to move!) and then also some more hours while the mirror set synchronised. But it's all done and I now have my volumes mirrored. I'm still curious though why the LVM based RAID1 didn't work. I'll just have to stay curious! Thanks once again. Regards, Tony. -- Tony Arnold, IT Security Analyst, University of Manchester. T: +44 (0) 161 275 6093, F: +44 (0) 705 344 3082, M: +44 (0) 773 330 0039, E: tony.arnold@manchester.ac.uk _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
