On Thu, Nov 8, 2018 at 2:41 PM <hunter86_bg@yahoo.com> wrote:
Hello Community,
Do you have any idea if SBD fencing mechanism will be implemented in the nearest future? It will be nice to be able to resset a host just like corosync/pacemaker cluster implementation.
We have more powerful and reliable mechanism, using host power management. When power management is not available or fail, we have similar mechanism using sanlock, which like sanlock is using the host watchdog and communicating with other hosts via shared storage. You can add a storage lease to HA VM. If the VM loose access to storage on a host, the system will start the VM on another host safely, even if the original host is not accessible or lost power. Leases are also used to recover storage jobs (like copying volumes) when the host performing the copy became non-responsive. We can fence the storage job and start it safely on another host, without waiting for the original host to become available again. Can you explain what are the advantages of SBD fencing? More info: - https://ovirt.org/develop/release-management/features/storage/vm-leases/ - https://www.youtube.com/watch?v=WLnU_YsHWtU - https://ahadas.github.io/slides/high_availability_with_no_split_brains.pdf - https://www.youtube.com/watch?v=Gh2eB06IE2A Nir