I had a question last week around HA’s datastore heartbeating, the question was if datastore heartbeating still worked if you only have 1 datastore in your environment. I can understand where the question comes from as HA throws this error that you need to have 2 datastores at a minimum for HA datastore heartbeating to function correctly. I want to point out that even though HA says that 2 datastores is the minimum, even when only one datastore is available it will be used for heartbeat purposes. Yes this error will be there on your cluster, and yes you can suppress it using “das.ignoreInsufficientHbDatastore“. I figured others might be hitting the same error and have the same question so why not document it?!
We just ran into this recently as well and it initially caused some confusion but concluded the same you’ve posted. I’ve submitted a ‘feature’ request via the VMware website, in reality it’s more like a bug report, to either fix the wording in vCenter to state 2 is recommended or get rid of the warning entirely as I suspect more and more people will run into. With larger and larger datastores being used, it isn’t that uncommon to run into clusters with a single datastore in some environments.