So I know this is a very subjective question and all considerations are valid for their usecases; but, I'm really curious what size LUNs people are carving up in traditional all-flash-array SANs for their datastores? 2TB, 4TB, 8TB, 20TB?!
We've been creating standard sized 4TB LUNs for years now and every time I see one of our vSAN datastores I ask myself if it's time to revisit our non-vSAN LUN sizes.
Fault domain, risk mitigation, recovery times, etc... all good points. Just curious what you're doing?
I think most people started creating larger LUNs the past decade or so. it used to be 512GB, then it became 1TB, and now 4/8/12/16TB is not uncommon. It very much depends on what you feel comfortable with. I think you already mention the key considerations: Fault domain, risk mitigation, recovery times. Plus of course any performance limitations of a single LUN and whether you need to do LUN level snapshots / replication.