Can I change the LEM hostname from default swi-lem to something else? If yes, how it can be done?
You can change the hostname by logging into the LEM appliance via SSH (instructions here).
You will be presented with this menu:
At the cmc prompt enter appliance:
At this point you can enter the hostname command & follow the on-screen steps from there:
As a note, any agents that are not connected when you change the hostname may need to be re-deployed.