I am setting up a Linux server (probably will be NixOS) where my VM disk files will be stored on top of an NTFS partition. (Yes I know NTFS sucks but it has to be this way.)
I am asking which guest filesystem will have the best performance for a very mixed workload. If I had access to the extra features of BTRFS or ZFS I would use them but I have no idea how CoW interacts with NTFS; that is why I am asking here.
Also I would like some NTFS performance tuning pointers.
I don't understand. Why would you store VM disks on NTFS? This isn't a viable solution and you need to rethink your design. Also for guest filesystems I would go with ext4 as it has lower overhead while still being reasonably modern.
It seems that way but it performs better than zfs on top of zfs. The only os I ran into that with was opnsense when I was playing with a virtualized firewall.
That's what I said. Cow on top of cow is bad. Pretty sure ext4 isn't on option on opnsense. UFS or zfs. Which is the only reason I mentioned it at all when presented with that choice.