Hi Patrick,
In order to stop/start the servers on Unix machines you will need to run sapcontrol command.
1. connect to with your MDM user (such as qxxadm).
2. go to mds exe folder where you can find the sapcontrol.
3. run the command: # sapcontrol -nr <server id> -function Start.
for example: # sapcontrol -nr 00 -function Start
for stopping the server just change Start to Stop (# sapcontrol -nr 00 -function Stop).
Also, you check if the process is still running or stopped by running the command: # "ps -ef | grep md"
(or you can be more specific and write the desired server process: mds-r / mdis-r / mdss-r
Hope that helped,
Regards,
Yoni