Systemd services and resource limits
We made the move to CentOS 7 and I switched out all init.d scripts with systemd services. Yesterday I noticed we started getting errors on our render farm for huge scenes which required loading of thousands of files:
V-Ray warning: Could not load mesh file ...
One hint that this wasn't due to scene misconfiguration was that the initial ~1000 vrmeshes were loaded successfully, and after that no other vrmesh file could be loaded.