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.
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why does it have to be this way?
I would also like to know why it has to be this way. Are you planning to dual boot I need that partition available in Windows?
Is it possible to do something like iscsi?
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.
Within guests these days I just use XFS, UFS, or NTFS depending on the os. The hypervisor can have zfs or ceph.
Ufs seems weird to use outside of flash
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.
Don’t do ZFS on ZFS. It will destroy performance.
I personally go for EXT4 as is solid and light weight. It is also somewhat resistant to power loss
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.
I have no idea how CoW interacts with NTFS
With btrfs you can disable COW for specific files, that might give you a little performance boost.
