Problem

-- How to start the Gateway when system reached 100% of disk space used and Gateway refuses to stop or start?

* Find the Gateway processes (ps -eaf | grep <gateway_user>) and kill them manually. Look out for zombie processes as well.
* (Unix/Linux only) Find the Gateway IPC queues (ipcs -a | grep <gateway_user>) and remove them with ipcrm.
* Then clear some disk space, and restart Gateway.