Our MSP refuses to consider ProxMox because “we need to support it”… but are happy as clams to throw me outrageous HyperV labor costs.
They’re literally putting me in a position where I either need to fire them because they refuse to use an open source solution and hire people that can read code… or fire them because they want 50,000 to move 15 VMs over to HyperV.
I want an MSP that isn’t scared of things outside of Microsoft.
It's honestly been easy as hell to support and upstream support contracts are available for cheap as chips, like a grand a socket a year or less. An MSP could partner with them to offer enhanced support if they were smart! It's just KVM / Qemu / Ceph on Linux, plenty of 3rd parties can provide support for it... just go spin up a cluster in a trio of VMware machines with nested virtualization turned on and take it for a spin.
Having done this to a number of clusters, it works really well; TLDR you can have it as simple as mounting the remote ESXi as a datastore and just migrating it straight over in the UI. Or automate it if you have 40,000 of them as Tesco does, though tbqh I'm not sure Proxmox is the solution for that scale of workload.
"Although it was written with VMware as the source in mind, most sections should apply to other source hypervisors as well."
https://pve.proxmox.com/wiki/Migrate_to_Proxmox_VE