Sometimes when you get to the end of the dock, you want to jump into the water. After getting comfortable (enough) with Proxmox I took the plunge and deleted ESXi 7 from my DL380 Gen9 and moved all of my VMs from the DL360G8 test server. Everything seems to work just fine.
I did not put the change the Smart Array P440ar Controller into IT mode. I left it in HBA mode with one mirror for Proxmox and another mirror for local ISOs. Now, that is a little overkill for the ISOs given they are enterprise SSDs. The other reason why I am not worried about HBA mode is that my VMs are on one of my NASes.
I did leave the (unconverted) ESXi VMs on the NAS and have the ESXi configuration backed up in case I need to revert. I like to have a solid fallback plan…
There is one major last thing I have to sort: I cannot get the bonded 10 GbE connections between the the DL380 and the RS1221+ to be stable. I am pretty sure that this is something with the bonding method I selected. There is no switch between the two – it is just NIC-to-NIC (times two). For now, I will let this sit for awhile.
Overall, I am impressed with Proxmox. VMs seem snappier that under ESXi. There are some quirks: there is no file manager as ESXi (really nice to have), the need to have different storage types for different purposes (head scratch) and the fact if you use LVM for iSCSI you cannot take snapshots (what?!?!).