Also the following is a related question.
Because we are going to do a data center maintenance for a lot of servers, we help networks group to shut down servers.
We have some of the servers have dependency, for example , we need to shut down web server first, then application server, then SQL server. when bringing it back, the opposite order.
But for some applications they only have web server, or sql server, how do we know they have a dependency.
If we start web server first, then SQl server, is it going to be a problem to connect after that?