I haven't had the opportunity to work on this in a while, but was trying to do exactly the same thing.  The issue I had was having the MDS connect to the host with the SSH keys and dump the files.  Host to MDS worked fine, but didn't seem acceptable to me.  I would be interested to see how this works out for you.  Similar to the last post, here is a primus article that list steps and additional information on how to setup.  emc165558.  Check out the primus as it lists some other good sources of information and some important notes on known issues.  Let me know if you are unable to pull up the primus and I can post.  
Trying to setup a job to dump some data (and clear logfiles) and push them to a remote server.  Running into two problems trying to either pull or push the data:  1) Trying to push from the MDS host using FTP the job hangs because it prompts for a password even though one is supplied. 2) Trying to pull data using SCP or SFTP doesn't work (I've tried numerous tools, platforms) against the MDS switch for some reason.  Anyone have any luck or specific process they use to automatically transfer files from their switch?
Transfer files from MDS switch