since RHEL 7, xfs is the new default filesystem. The problem is, that only ext4 is officially tested and supported. We ran into huge problems while trying to install NPS (more precisely the IBM Cognos BI part of the installation) and it seems that the xfs filesystem we use could be the problem (we need to reinstall our Linux server, so the case is currently still)
No matter if it is the reason or not, I think it would be a good idea if Microfocus could take a further look into this topic, doing their tests and maybe change some code which could cause problems. I am pretty sure that more and more people will be upgrading to Redhat 7 and could run into similar problems.