On Wed, Dec 2, 2020 at 10:27 AM Joy Li <[email protected]> wrote: > > Hi All, > > I'm facing the problem that after adding disks to guest VM, the device target > path changed (My ovirt version is 4.3). For example: > > Before adding a disk: > > virsh # domblklist <vmname> > Target Source > --------------------------------------------------------- > hdc - > vda /dev/mapper/3600a09803830386546244a546d494f53 > vdb /dev/mapper/3600a09803830386546244a546d494f54 > vdc /dev/mapper/3600a09803830386546244a546d494f55 > vdd /dev/mapper/3600a09803830386546244a546d494f56 > vde /dev/mapper/3600a09803830386546244a546d494f57 > vdf /dev/mapper/3600a09803830386546244a546d494f58 > > After adding a disk, and then shutdown and start the VM: > > virsh # domblklist <vmname> > Target Source > --------------------------------------------------------- > hdc - > vda /dev/mapper/3600a09803830386546244a546d494f53 > vdb /dev/mapper/3600a09803830386546244a546d494f54 > vdc /dev/mapper/3600a09803830386546244a546d494f6c > vdd /dev/mapper/3600a09803830386546244a546d494f55 > vde /dev/mapper/3600a09803830386546244a546d494f56 > vdf /dev/mapper/3600a09803830386546244a546d494f57 > vdg /dev/mapper/3600a09803830386546244a546d494f58 > > The devices' multipath doesn't map to the same target path as before, so in > my VM the /dev/vdc doesn't point to the old > /dev/mapper/3600a09803830386546244a546d494f55 anymore. > > Anybody knows how can I make the device path mapping fixed without being > changed after adding or removing disks.
Device nodes are not stable, and oVirt cannot guarantee that you will get the same node in the guest in all runs. You should use /dev/disk/by-id/xxx links to located devices, and blkid to create fstab mounts that do not depend on node names. Regardless, oVirt try to keep devices stable as possible. Do you know how to reproduce this issue reliably? Nir _______________________________________________ Devel mailing list -- [email protected] To unsubscribe send an email to [email protected] Privacy Statement: https://www.ovirt.org/privacy-policy.html oVirt Code of Conduct: https://www.ovirt.org/community/about/community-guidelines/ List Archives: https://lists.ovirt.org/archives/list/[email protected]/message/5EHZXH2URP7WYJZPHW6CBGGD6ZIK2SQA/
