Hi Nikola, are the virtualisation hosts based on equal hardware (especially cpu)?
What are the qemu parameters for the disks? Do you use virtio drivers and caching options? My default is -drive format=rbd,file=rbd:kvm/awv66_c:id=kvm,media=disk,if=virtio,discard=on,cache=writethrough where kvm is the storage pool awv66_c the virtual disk. And when you convert die virtual disc with qemu-convert offline all is fine? Regards Steffen >>> Nikola Ciprich <nikola.cipr...@linuxbox.cz> schrieb am Dienstag, 19. Januar 2016 um 07:58: > So I've done another test and unfortunately I can confirm that > this kind of migration leads to data corruption - I've run > chkdisk prior to migration, everything went without errors, > then tried it after migration and it reported corrupted filesystem > indexes again - I needed to reboot the machine and have it fixed.. > (windows 2012 R2 again) > > any ideas? > > BR > > nik > > > On Wed, Jan 13, 2016 at 01:30:28PM +0100, Nikola Ciprich wrote: >> Hello Steffen, >> >> thanks for your reply.. >> >> > 1. Did you test a migration to non-rbd storage succesfully without this >> > bad behavior after migration? >> nope, I was onbly testing migration to RBD, but it seemed to be OK. I only >> have this one windows VM which seemed to be damaged, but I'm not sure if >> it was caused by migration or not.. but it seems to be strange coincidence, >> so I'm rather paranoid here.. >> >> >> > >> > 2. Did you install and run another vm on your rbd storage? Does this vm > perform normally? >> yes, there are other machines working on this storage without issues.. >> also I've migrated other vms using this procedure without issues >> >> so I'm still uncertain now, whether it's safe or not.. >> >> BR >> >> nik >> >> >> >> >> >> > >> > Regards >> > >> > Steffen >> > >> > >> > >>> Nikola Ciprich <nikola.cipr...@linuxbox.cz> schrieb am Mittwoch, 13. >> > >>> Januar >> > 2016 um 08:29: >> > > Hello qemu users, >> > > >> > > I'd like to ask about nonshared migration.. >> > > >> > > I have a server with virtual machines running on raw block devices.. >> > > I'd like to migrate those to ceph / RBD storage without downtime. >> > > >> > > I've tested following procedure (I'm using qemu-kvm + libvirt based >> > > management) >> > > >> > > 1) create RBD devices of the same size >> > > 2) create new XML domain definition file with storage changed to new RBD >> > > devices (vm-new.xml) >> > > 3) migrate vm using libvirt: >> > > migrate --verbose --xml /tmp/vm-new.xml --copy-storage-all --live >> > > vmlbx50 >> > > qemu+tcp://lbxphav1a/system >> > > >> > > this seemed to do the trick, I've tested it for both linux and windows >> > > machines. >> > > >> > > however, one windows 2k12 machine slowed down badly after migration, and >> > > after reboot, >> > > chkdisk showed lots of corrupted filesystem indexes (i'm not windows >> > > guru, > >> > > so >> > > hopefully I'm not confusing this much). After fixing those, everything >> > > started >> > > working OK again, but I'm now concerned whether this procedure is really >> > > safe.. >> > > >> > > is there enybody who could confirm or comment on this? >> > > I'm using qemu-2.2.1 and libvirt 1.2.6 on source machine, >> > > qemu-2.3.0 and libvirt 1.2.15 on target box.. >> > > >> > > thanks a lot in advance! >> > > >> > > BR >> > > >> > > nik >> > > >> > > -- >> > > ------------------------------------- >> > > Ing. Nikola CIPRICH >> > > LinuxBox.cz, s.r.o. >> > > 28.rijna 168, 709 00 Ostrava >> > > >> > > tel.: +420 591 166 214 >> > > fax: +420 596 621 273 >> > > mobil: +420 777 093 799 >> > > www.linuxbox.cz >> > > >> > > mobil servis: +420 737 238 656 >> > > email servis: ser...@linuxbox.cz >> > > ------------------------------------- >> > >> > >> > -- >> > Klinik-Service Neubrandenburg GmbH >> > Allendestr. 30, 17036 Neubrandenburg >> > Amtsgericht Neubrandenburg, HRB 2457 >> > Geschaeftsfuehrerin: Gudrun Kappich >> > >> > >> >> -- >> ------------------------------------- >> Ing. Nikola CIPRICH >> LinuxBox.cz, s.r.o. >> 28.rijna 168, 709 00 Ostrava >> >> tel.: +420 591 166 214 >> fax: +420 596 621 273 >> mobil: +420 777 093 799 >> www.linuxbox.cz >> >> mobil servis: +420 737 238 656 >> email servis: ser...@linuxbox.cz >> ------------------------------------- > > > > -- > ------------------------------------- > Ing. Nikola CIPRICH > LinuxBox.cz, s.r.o. > 28.rijna 168, 709 00 Ostrava > > tel.: +420 591 166 214 > fax: +420 596 621 273 > mobil: +420 777 093 799 > www.linuxbox.cz > > mobil servis: +420 737 238 656 > email servis: ser...@linuxbox.cz > ------------------------------------- -- Klinik-Service Neubrandenburg GmbH Allendestr. 30, 17036 Neubrandenburg Amtsgericht Neubrandenburg, HRB 2457 Geschaeftsfuehrerin: Gudrun Kappich
