This diagram supersedes the workflow described in the Casablanca Use Case
Resolved
For Dublin Scaling will be done to respond to load issues. Either manually or automatically. Auto Scale In will be done based on the VNF crossing a low threshold trigger
In Dublin we will use a Last In First Out (LIFO) method for targeting the instance to be removed
We will add a Pre and Post Action Signal to notify the VNF when a scaling action is about to occur and when it has finished
We will use Distribute_Traffic to move new traffic away from the target instance
We will Use Quiesce_Traffic to return a signal when all existing traffic has been drained from the target instance
We will need to issue a Stop_VM before we issue the Terminate_VM
NOTE: Scale In releases all resources (e.g. IP Addresses) for use by other VNFs. The next scale out option will not re-use the resources released by Scale In.
To Do
Need to Lock VNF so that other operations will not conflict with Scaling Actions
Need to further define "Pre Action - Scale In" and "Post Action - Scale In"
Need to work with APPC team to make "Distribute_Traffic" and "Quiesce_Traffic" operate at the VNFC/VF_Module level