This volume of the Lecture Notes in Computer Science series contains all papers accepted for
presentation at the 20th IFIP IEEE International Workshop on Distributed Systems: Operations
and Management (DSOM 2009) which was held in Venice Italy during October 27-28 2009. DSOM
2009 was the 20th event in a series of annual workshops. It followed in the footsteps of
previous successful meetings the most recent of which were held on Samos Greece (DSOM 2008)
San Jos´ e California USA (DSOM 2007) Dublin Ireland (DSOM 2006) Barcelona Spain (DSOM
2005) and Davis C- ifornia USA (DSOM 2004). The goal of the DSOM workshops is to bring -
gether researchersfromindustry andacademia workingin the areasofnetworks systems and service
management to discuss recent advances and foster future growth. In contrast to the larger
management conferences such as IM (Inter- tional Symposium on Integrated Network Management)
and NOMS (Network OperationsandManagementSymposium) DSOMworkshopshaveasingle-track program in
order to stimulate more intense interaction among participants.
