@marcel_jomasoft OVM Manager confused a lot of people. IIRC it required LDoms to use a an NFS mounted vdisk to function.
People would get OVM Sparc, and then want OVM Manager. Until they realised they needed a separate Oracle Linux setup.
I only ever dealt with one client actually using it.
OpsCenter should have really done the task, but it (IME) was over engineered for small configs and was a PITA to setup. It's handing of zones was attrocious IMO. And getting anything fixed was impossible.