On a 2-node Cluster (back2back) with 3 HDD's each, which has it's vSAN Datastore filled to 73%, the "vSAN Capacity Utilization, disk space" Alert is already in a warning state. If i'm not mistaken, that threshold "Warning" used to be 80% in 6.x
Is this a bug? Why start complaining at 73% ? It's a 2 node after all.
Yeah I read that about an hour after I posted my post 🙂 Both 6.7 and 7.0 say 30%.
Them 30% is a bit "conservative" eh? Customers always complain about needing to buy so much % more storage than the usable capacity that they need and vSAN throws salt in that would by requiring so much "overhead" (as that's how customers tend to interpret it).
On a normal cluster, this makes sense as there needs to be space on other nodes for rebuilds in case of "node-death". On 2-Nodes however, there is no place to go so those 30% and "What if the most consumed host fails" Alert are rather pointless. I'd say get rid of the latter alert on 2-node and up the free space threshold to 85% or so...