Q: What method is used for VCSA HA heartbeating (to validate that the primary VC is really not available)?
A:
There is a TCP hearbeat that happens every second between the nodes (initiated from the Active node). We monitor the active node via that heartbeat and ping. A failover is triggered when there are 3 lost heartbeats followed by 5 failed pings. Therefore, the node (or network) would need to be down for at least 8 seconds for a failover to be triggered.
The heartbeating technology that we use is based off of FDM (which is what vSphere HA uses) so it is a mature methodology that should work quite well.
A:
There is a TCP hearbeat that happens every second between the nodes (initiated from the Active node). We monitor the active node via that heartbeat and ping. A failover is triggered when there are 3 lost heartbeats followed by 5 failed pings. Therefore, the node (or network) would need to be down for at least 8 seconds for a failover to be triggered.
The heartbeating technology that we use is based off of FDM (which is what vSphere HA uses) so it is a mature methodology that should work quite well.
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