Not sure how this is relevent. But since you ask; no, I don't believe in clusters for Proxmox
HA is IMHO grossly overrated and in many setups it causes more downtime because of added complexity than it actually saves uptime.
Especially considering how rock solid a good server with ZFS mirrors and redundant PSU runs.
Even for single nodes, software has always be a way higher risk factor than hardware for me. To be honest, in all these decades running servers, I never had a single downtime because of hardware. I had once a PSU failing, once DELL VRTX CMC, 3 APC batteries and maybe 10 disks failing, not a single failure that actually caused downtime (besides the two times fiber line cutting from construction and once power outage for 3 hours, but these would have happened with a cluster too).
