The mappings will time out (eventually), but of course each one will got through the time out.

What you can do depends on how the server has crashed. In some circumstances you will get responses to ping connectivity checks, so that may not determine if the server is up.

A simple solution for you to mimimise the time that it takes is to check @ERROR after your first mapping to the dodgy server. If the first mapping fails skip the other mappings to the same server, and send an alert via mail, mesg or event log to let you know there is a problem.