Troubleshooting DAG database replication

- [Instructor] Database availability groups, or a DAG,…allows multiple servers to have copies…of exchange server 2016 databases for high availability…and auto fail over purposes.…In previous videos we discussed and demonstrated…how to set up a DAG, add members,…and add copies of the databases.…Sometimes the database no longer works correctly…and we need to troubleshoot the replication.…So let's start by going in to the exchange admin center…and clicking on servers on the left hand side…and then click at databases at the top.…

From here we can see our first database…has two copies on it.…Copies on exchange two and copies on exchange three.…If we look at the right side hand side,…we'll see that our passive copy…on exchange three is suspended…and we need to get that going again.…Now, we have a couple of options.…One way is to choose resume,…which picks up where the copying stop…because of some sort of communication error…between the two servers.…The other option is to recede the database.…Receding actually deletes all of the files,…