I'm running a variant of that. SM dual-head jbod with 2 linux servers. One is minimal config as secondary. Haven't had a failure yet, just switching to secondary when primary needs a reboot due to OS update.
Dunno about bhyve, but proxmox does the VMDKs as zvols. Maybe that sucks, performance-wise? Although 2 minutes sounds like a lot. Is this done at the CLI? I haven't used proxmox for quite awhile, but I'm wondering if they are not doing zfs snapshots, but something else?
I don't think I was clear, sorry. What I've noticed in the past: if the master AP reboots, wifi is offline until failover to the other one. That's where the message about reconfiguring comes in. It kinda surprised me that there is that long of an outage.
I have 2 units in my house - one on the ground floor, and one in the finished basement. Whenever I've done an update before, there is an outage of several minutes, even though only one AP is offline/rebooting. I vaguely recall seeing a message about updating the configuration or whatever (e.g...