I got 4 Sabrent 2TB QLC nvme drives (PCIE 4) and want to use them to run my VMs off of them. I used to have 6x SSDs with raidz (ZFS) and am getting rid of those. Would a "Raid 10" (https://calvin.me/create-zfs-raid-10-array-napp) be best in zfs or a simple raidz? I know with software raid 5 in windows, performance would slow down because of the CPU. I want speed and redundancy.

34 minutes ago, TheSkaz said:

I know with software raid 5 in windows

I'm not 100% certain, but I don't think Windows will have a clue that its "boot disk" is located on a RAID array of any sort since it's running in a VM. To Windows, I believe the source location will simply look like "a disk". It's unRAID/hardware that will detail with all the RAID details.

2 minutes ago, FreeMan said:

I'm not 100% certain, but I don't think Windows will have a clue that its "boot disk" is located on a RAID array of any sort since it's running in a VM. To Windows, I believe the source location will simply look like "a disk". It's unRAID/hardware that will detail with all the RAID details.

I was referencing old knowledge from motherboard "software raid" setups. I know the VM doesn't care.  I was curious of the best setup within Unraid.

Wont the VMs be bottlenecked by the virtio scsi driver? QEMU needs a stable working nvme emulator driver for VM guests so we dont have to passthrough nvme drives to gain maximum performance.