Update source/administration/production-notes.txt

update notes with NFS flags to let MongoDB work on a NFS drive.

Author: brianwawok

source/administration/production-notes.txt

@@ -144,7 +144,10 @@ Remote Filesystem
 ~~~~~~~~~~~~~~~~~
 
 Some versions of NFS perform very poorly with MongoDB and NFS is not
-recommended for use with MongoDB.
+recommended for use with MongoDB. However - if you want to use NFS
+anyway, you can. If you get an error: "Can't take a write lock while 
+out of disk space", you need The NFS command line options "bg" and "nolock"
+added to your NFS mount in fstab.
 
 Many MongoDB deployments work successfully with Amazon's *Elastic
 Block Store* (EBS) volumes. There are certain intrinsic performance