vSphere 7.0 supports vMotion of a VM hosting a node of a WSFC.
Pre-requisites for vMotion support:
- vMotion is supported only for a cluster of virtual machines across physical hosts (CAB).
- The vMotion network must be a 10Gbps Ethernet link. 1Gbps Ethernet link for vMotion of WSFC virtual machines is not supported.
- vMotion is supported for Windows Server 2008 SP2 and above releases. Windows Server 2003 is not supported.
- The WSFC cluster heartbeat time-out must be modified at least to the values listed below:
- (get-cluster -name <cluster-name>).SameSubnetThreshold = 10
- (get-cluster -name <cluster-name>).CrossSubnetThreshold = 20
- (get-cluster -name <cluster-name>).RouteHistoryLength = 40
- The virtual hardware version for the WSFC virtual machine must be version 11 and later.
Modifying the WSFC heartbeat time-out:
WSFC nodes use the network to send heartbeat packets to other nodes of the cluster. If a node does not receive a response from another node for a specified period of time, the cluster removes the node from cluster membership. By default, a guest cluster node is considered down if it does not respond within 5 seconds in Windows 2008 R2, 2012, 2012 R2. Other nodes that are members of the cluster will take over any clustered roles that were running on the removed node.
An WSFC virtual machine can stall for a few seconds during vMotion. If the stall time exceeds the heartbeat time-out interval, then the guest cluster considers the node down and this can lead to unnecessary failover. To allow leeway and make the guest cluster more tolerant, the heartbeat time-out interval needs to be modified to allow at least 10 missed heartbeats. The property that controls the number of allowed heart misses is SameSubnetThreshold. You will need to modify this from its default value to at least 10. From any one of the participating WSFC cluster nodes run the following command:
(get-cluster -name <cluster-name>).SameSubnetThreshold = 10