>>>>> "Zdenek" == Zdenek Kabelac <zkabelac@redhat.com> writes: Zdenek> Dne 26.11.2015 v 11:29 Tony Arnold napsal(a): >> 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! Zdenek> 4.1 & 4.2 kernel has broken RAID Zdenek> DO NOT USE (at least with lvm2 - but since the flaw there is md driver Zdenek> I assume mdadm is affected as well) Zdenek> Switch to 4.3 please. Was this fixed in 4.2.6 by any chance? That's what I'm currently running... _______________________________________________ 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/
