make 2 direfent system folders but you'll have to patch the l2.ini file in order to make it run.
I made 2 customs here (this is for ct1 anyway)
INSTRUCTIONS
* create 2 new system folders and rename them to:
system1
system2
* edit your hosts files adding this 2 lines
127.0.0.1 lineageserver1
127.0.0.1 lineageserver2
NOTE that the IP 127.0.0.1 is only an example you need to replace those for your server's IPs
Now you are done start from any of the 2 (in fact you can have 3 now using the unedited system one) servers.
Files:
remember to delete the (system1) or (system2) word from the name