About resource ID
In Openstack, every resource created (line an instance, volume, network or security group) has a unique identifier. These IDs are generated automatically for every resource being created, the user can't modify them. Important property of such ID is that, unlike a name, the ID is guaranteed to be unique within the entire cloud (and probably even across all the clouds)
A typical ID may look like this:
An ID is the most reliable way to locate proper resource. Thus, when you contact the support team about an issue with any specific resource (like an instance or a volume), it is always a smart idea to provide the ID (and not just the name) of the resource in question.