A vSAN Witness has connectivity to a vSAN cluster with supported maximum latency of 500 milliseconds round-trip time (RTT). Which vSAN cluster type is the vSAN Witness a member of?
A. vSAN stretched cluster with 4 nodes in each site
B. vSAN 2-node direct connected cluster
C. 4-node vSAN cluster using erasure coding
D. 16-node vSAN cluster with nested fault domains
anyone pass 5V0-21.19 according to this dump? is it good enough?
I have passed today – but it was ~40% of new questions
Definitely B
https://cormachogan.com/2015/09/11/a-closer-look-at-the-vsan-witness-appliance/
https://blogs.vmware.com/virtualblocks/2015/09/11/vmware-virtual-san-robo-edition/
https://storagehub.vmware.com/t/vmware-vsan/vsan-2-node-guide/networking-and-latency-requirements-4/
The answer is NOT C or D because these answers describe typical clusters, which have a <= 5ms latency requirement.
https://kb.vmware.com/s/article/2149511
The answer is NOT A for a couple of reasons. Firstly, the witness cannot be part of the stretch cluster. The cluster contains only the nodes accessing/contributing to storage. Secondly, the latency has to be 200 ms or less round trip.
https://storagehub.vmware.com/t/vmware-vsan/vsan-stretched-cluster-guide/networking-and-latency-requirements-5/:
“The latency to the witness is dependent on the number of objects in the cluster. VMware recommends that on vSAN Stretched Cluster configurations up to 10+10+1, a latency of less than or equal to 200 milliseconds is acceptable, although if possible, a latency of less than or equal to 100 milliseconds is preferred. For configurations that are greater than 10+10+1, VMware requires a latency of less than or equal to 100 milliseconds.”
B
r two node ROBO configurations, there is a 5ms RTT between data sites and a 500ms RTT between the data sites and the witness.