@MrNaz I recommend reading the XO blog; updates are published monthly.
NBD was introduced in the 5.76 release and the ability to enable in the Xen Orchestra UI was introduced in 5.79
https://xen-orchestra.com/blog/xen-orchestra-5-76/
https://xen-orchestra.com/blog/xen-orchestra-5-79/
Also enhancements were released in 5.81
https://xen-orchestra.com/blog/xen-orchestra-5-81/
@sb2014 In the 5.85 release of XO there were updates to the Netbox plugin that now requires three objects in the UUID field.
https://xen-orchestra.com/blog/xen-orchestra-5-85/
Here are the ones you need:
Virtualization > cluster
Virtualization > virtual machine
Virtualization > interface
@Denson You can mount from the CD in Xen Orchestra on the Console tab or install from the EPEL repo. (I always install from EPEL)
EPEL install:
dnf install https://dl.fedoraproject.org/pub/epel/epel-release-latest-9.noarch.rpm -y
Tool install:
dnf install xe-guest-utilities-latest -y
Be sure to enable and start after installing: systemctl enable --now xe-linux-distribution