We run the free Proxmox at work and you can update the free version from one major release to another, but if you have a cluster, live migration doesn't always work between major releases (causing downtime during upgrades...grrr) and sometimes even between minor releasesChirpychirps77 wrote: ↑2018/01/13 17:05:44...but if not paying (for Proxmox) cannot update to next major release, have to rebuild clean for that).
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For example, while you can live migrate between 4.X and 5.X nodes in a cluster, you *can't* between 3.X and 4.X. I recently started warm upgrades from 4.X to 5.X and it's worked pretty well so far.
The only really bad experience I had with Proxmox was trying to use GlusterFS. The early Proxmox releases had horrendously buggy/old GlusterFS versions that just spectacularly collapsed regularly. When it opened 1 million files in 20 minutes - yes, running out of any spare file handles for the entire system - we abandoned it and just used iSCSI to SANs that were mirrored via drbd instead.