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