High Availability Systems based on a Microsoft Hyper-V Cluster increases the availability of applications running on Virtual Servers.
If a Server host malfunctions, the Virtual Servers are migrated to another Server platform without service interruption, the failover / migration is transparent to users.
Planned failover and migration between Server platforms greatly simplifies operating system maintenance / patching and hardware upgrades, these admin tasks can be carried out without user downtime.
If your business requires its core servers to be operate continuously for an extended period of time without downtime then you need to consider a “High Availability / Failover Cluster”