NetWare 4.11 Server Crashed

I have a tree with three NetWare 5.0 servers. It also had a NetWare 4.11 server that was going to be retired. Well the the server died. What do I do now so that NDS, etc isn’t affected by it? In NDSMgmr, it is setup to Read\Write. What steps do I need to take? So far things are still running smooth.