That said it is always better to use ECC RAM regardless of the filesystem in use, but don’t panic if you don’t have ECC, I don’t have it either. There is a lot of talk about ZFS requiring error correcting (ECC) RAM, this is simply not true, ZFS does not require ECC RAM any more than other filesystems. if you can’t or don’t want to do that, the tips below will help you manage the memory you do have available. Ideally, I would just add enough RAM to cover all of my VM allocations plus about 50% to 55% for ZFS and Proxmox, but I can’t justify that expense right now. I recently migrated my production system over to a fresh install on ZFS with PVE version 6 which was overall a great success, but I had to do some quick research on memory tuning to fend off the infamous OOM (Out Of Memory) killer, and that is what I’ll be sharing with you today. How to increase the amount of RAM available to virtual machines by tuning the virtualization host.
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