Example: You have 2 web servers running together behind a load balancer. If both web servers are running on the same physical host and the physical were to fail, you will incur some downtime until our HA technology restarts your servers on another physical server. If the web servers were segregated, both wouldn't have gone down, only one; thereby, your system would not have incurred any downtime.
1. Click Tools > Segregate Virtual Server
2. Choose the virtual server you want to separate this virtual server from and click Segregate Virtual Server