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-rw-r--r--requirements/03-architecture.rst9
1 files changed, 6 insertions, 3 deletions
diff --git a/requirements/03-architecture.rst b/requirements/03-architecture.rst
index 1b05935b..2f9d24be 100644
--- a/requirements/03-architecture.rst
+++ b/requirements/03-architecture.rst
@@ -128,9 +128,12 @@ affected by failures on the physical resources under them. Unavailability of a
virtualized resource is determined by referring to the mapping of physical and
virtualized resources.
-The relation from physical resources to virtualized resources shall be
-configurable, as the cause of unavailability of virtualized resources can be
-different in technologies and policies of deployment.
+VIM shall allow configuration of fault correlation between physical and
+virtual resources. VIM shall support correlating faults:
+
+* between a physical resource and another physical resource
+* between a physical resource and a virtual resource
+* between a virtual resource and another virtual resource
Failure aggregation is also required in this feature, e.g., a user may request
to be only notified if failures on more than two standby VMs in an (N+M)