Reset Linode root password

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http://serverfault.com – I've recently been put in charge of a Ubuntu server in the Linode platform. This webserver is running a production Rails application with a MySQL database. I need to ssh into it to download a copy of the database to perform further development locally. I've read that Linode requires to shut down the node before letting you reset the root password from the rescue tab in the manager. Is the "Shut Down" button in the dashboard safe to use and restart a production webserver? Won't the server lose any data? (I'm asking this because I'm used to Amazon AWS, where servers are not persistent) Is t (HowTos)