In a vSAN Stretched Cluster configuration, when is the non-preferred site determined to be isolated?
A. When the master node is unable to communicate with any non-preferred site nodes
B. When the nodes in the non-preferred site are unable to communicate with the vSAN Witness
C. When the backup node is unable to communicate with the preferred site
D. When the master node is unable to communicate with the backup node
A
The correct answer is B.
Scott is right its A
Not B for this reason:
From the vSAN Stretched Cluster Guide:
“Virtual machines running in both of the main sites of a Stretched Cluster are not impacted by the vSAN Witness Host being partitioned. Virtual machines continue to run at both locations.”
So, the answer is A
Not C for the same reason as not D. C indicates a host issue. More information is required to determine whether or not C is part of a site isolation issue.
Not D for this reason:
From the vSAN Stretch Cluster Guide:
“The vSAN Master Node and the vSAN Backup Node send heartbeats every second. If communication is lost for 5 consecutive heartbeats (5 seconds) between the Master and the Backup due to an issue with the Backup node, the Master chooses a different ESXi host as a Backup on the remote site. This is repeated until all hosts on the remote site are checked. If there is a complete site failure, the Master selects a Backup node from the Preferred Site.”