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ZFS is great, but to take advantage of it's positives you need the right drives, consumer drives get eaten alive as @scrubbles@poptalk.scrubbles.tech mentioned and your IO delay will be unbearable. I use Intel enterprise SSDs and have no issues.
No idea why you're getting downvoted, it's absolutely correct and it's called out in the official proxmox docs and forums. Proxmox logs and journals directly to the zfs array regularly, to the point of drive destroying amounts of writes.
I'm not intending to run Proxmox on it. I have that running on an SSD, or maybe it's an NVME, I forget. This will just be for data storage mainly of photos that one VM will manage and NFS share out to other machines.
Ah I'll clarify that I set mine up next to the system drive in proxmox, through the proxmox zfs helper program. There was probably something in there that set up settings in a weird way
Yes I'm specifically referring to your ZFS pool containing your VMs/LXCs. Enterprise SSDs for that. Get them on ebay. Just do a search on the Proxmox forums for enterprise vs consumer SSD to see the problem with consumer hardware for ZFS. For Proxmox itself you want something like an NVME with DRAM, specifically underprovisioned for an unused space buffer for the drive controller to use for wear leveling.