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You'll need to populate saml20-idp-remote.php with the contents of This Cornell specific info (XML file). This can be done by going to the "Federation" tab and using the "XML to simpleSAMLphp metadata converter". Be sure to add "<?php" and "?>" to the beginning / end of the generated file.
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See comments here for more context: http://drupal.org/node/1931394
*Datastore: * The simpleSAMLphp Drupal module requires using a datastore other than the default phpsession. Other options are memcache and SQL - below is a sample config for using sqlite3 on a *nix machine (using no username/password):
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