You can only delete query servers, not the write server. To delete a query server, right-click on that server and choose Delete from the popup menu.
Currently, the delete will fail if another user is logged in as DBA for a database on the specified write server.The wizard prompts you to verify the delete operation before continuing.
Click the option button to delete associated files, if desired, and choose Finish.
If the wizard fails to remove any of the directory paths associated with the server, it displays a notification message. This is typically due to a sharing violation. The delete operation succeeds and containers redisplay as appropriate. You should then drop any files/paths that could not be dropped automatically.