On 10/18/2014 12:14 PM, mad Engineer wrote: > I am trying to understand more about metadata server. This image rather old. Please correct me if today it is different. http://img.blog.csdn.net/20130617193733343 HTH, Christian. -- Christian Berendt Cloud Solution Architect Mail: berendt at b1-systems.de B1 Systems GmbH Osterfeldstraße 7 / 85088 Vohburg / http://www.b1-systems.de GF: Ralph Dehner / Unternehmenssitz: Vohburg / AG: Ingolstadt,HRB 3537