Time Taken for a Service Group Failover

The time it takes to fail over a service group when a resource faults equals

• the time it takes to detect the resource fault
• the time it takes to offline the service group on source system
• the time it takes for the VCS policy module to select target system
• the time it takes to bring the service group online on target system

The time it takes to fail over a service group when a system faults equals

• the time it takes to detect system fault
• the time it takes to offline the service group on source system
• the time it takes for the VCS policy module to select target system
• the time it takes to bring the service group online on target system

The time it takes the VCS policy module to determine the target system is negligible in comparison to the other factors.

If you have a firm group dependency and the child group faults, VCS offlines all immediate and non-immediate parent groups before bringing the child group online on the target system. Therefore, the time it takes a parent group to be brought online also depends on the time it takes the child group to be brought online.