Hi
@paddy
You can run TrueNAS CORE or SCALE as a VM, but with some caveats on the configuration required. Check out our more detailed blog post on this subject:
TrueNAS is a powerful storage virtualization software solution that helps businesses virtualize data. Get started today with TrueNAS.
www.truenas.com
CORE is based on FreeBSD, and SCALE is based on Linux. Both are installable ISOs.