Host Failover Groups
A failover group is a collection of host systems that share storage for virtual systems, and so can act as backups for each other if one goes down. This allows a virtual system to be automatically re-started on another host with the same virtual disks or filesystem in the event of a hardware failure.

Each failover group is for a specific virtualization type (like OpenVZ or Xen), and must contain at least two host systems that support that virtualization method. For failovers to actually work, all virtual systems must share the directories containing their filesystems or disk images, either via NFS, Cluster LVM or iSCSI.

When a failover group is set to automatic mode, Cloudmin will detect host systems that have failed and move virtual systems off them to new hosts in the group, where possible. This will only happen after a period of downtime that you can configure on a per-group basis.

Virtual systems can also be forcible failed off a down host using the Force Failover item on the left menu, or the failover-system API command.