If I try to install the greyhole plugin via webinterface, it fails with the following error message:
According to OMV Extras homepage, the erasmus-greyhole repo is listed as stable.
I also tried to use unionfilesystems, but there I can not add a new share for the created drive pool.
If I want to pick a drive, I get the following error message:
Host: ESXi 6 Update 2