Raspbian Jessie uses systemd and most system startup processes seem to be run from .service files. There are still a lot of SysV init entries. I gather from reading various articles that Debian 8 has support for both systems.
Can anyone explain which SysV init entries are still supported and which not? How does systemd call init entries? Does it ignore if corresponding .service is running?
I have found a partial answer in man systemd.service
"If a service is requested under a certain name but no unit configuration file is found, systemd looks for a SysV init script by the same name (with the .service suffix removed) and dynamically creates a service unit from that script."