The note is about ISO storage domain - this is a special storage
domain that can be created
only on NFS, and can hold only ISO images. To add ISO images to this
special storage domain,
you had to use a special iso uploader program, or add manually to the
right place in the storage
domain directory, and make sure the permissions are correct. This
storage domain type was
deprecated several version ago,
Might I suggest that you folks revisit the issue of what to do with the
"guest tools iso". Since supposedly they are,
"provided by the oVirt-guest-tools-iso package installed as a dependency
to the oVirt Engine. This ISO file is located in
/usr/share/oVirt-guest-tools-iso/oVirt-tools-setup.iso on the system
on which the oVirt Engine is installed."
https://www.ovirt.org/documentation/vmm-guide/chap-Installing_Windows_Vir...
(the package is no longer an automatic dependancy either. at least for hosted-engine)