When you use Xsan Admin to remove a metadata controller, all metadata controllers must be accessible to do so. In many an upgrade scenario this has turned out to be challenging. Therefore, you can remove a metadata controller using the configuration files. To do so, open /Library/Preferences/Xsan/fsnameservers. In this file, you’ll see the IP address of all active metadata controllers that are used to manage any (or no) volumes as follows: 192.168.210.2 192.168.210.3 192.168.210.4 Remove the line with the IP address of the system you’ll be removing so it looks like the following, assuming you’re removing 192.168.210.2): 192.168.210.3 192.168.210.4 This needs to be repeated for all metadata controllers and clients.…