Update faq.rst (apache#1637)

Related to apache#1557

docs/faq.rst

@@ -109,3 +109,13 @@ for dealing with the time boundary filtering mentioned above.
 But what happens with filtering when dealing with slices coming from
 different tables or databases? If the column name is shared, the filter will
 be applied, it's as simple as that.
+
+Why does fabmanager or superset freezed/hung/not responding when started (my home directory is NFS mounted)?
+-----------------------------------------------------------------------------------------
+superset creates and uses an sqlite database at ``~/.superset/superset.db``. Sqlite is known to `don't work well if used on NFS`__ due to broken file locking implementation on NFS.
+
+__ https://www.sqlite.org/lockingv3.html
+
+One work around is to create a symlink from ~/.superset to a directory located on a non-NFS partition.
+
+Another work around is to change where superset stores the sqlite database by adding ``SQLALCHEMY_DATABASE_URI = 'sqlite:////new/localtion/superset.db'`` in superset_config.py (create the file if needed), then adding the directory where superset_config.py lives to PYTHONPATH environment variable (e.g. ``export PYTHONPATH=/opt/logs/sandbox/airbnb/``).