Multisite identity service management:
   https://git.opnfv.org/cgit/multisite/tree/docs/requirements/multisite-identity-service-management.rst

VNF_high_availability_across_VIM: 
   https://git.opnfv.org/cgit/multisite/tree/docs/requirements/VNF_high_availability_across_VIM.rst
   
Multisite VNF Geo site disaster recovery:
   https://git.opnfv.org/cgit/multisite/tree/docs/requirements/multisite-vnf-gr-requirement.rst