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Typical use cases:
1.Ensure Bandwidth for Each New VM
1.1 Use case description:
It's critical to ensure compute nodes with enough bandwidth to run VMs,
especially those who run network-sensitive applications. When the VMs of a host
are running network-sensitive applications such as Web servers, Ftp servers and
vEPC (a typical telecom application), as a new user, he may raise a request to
avoid starting a new network-sensitive VM on the busy host.
In this use case, the VIM should detect that the busy host is not suitable for
the new network-sensitive VM. In other words, the busy host can be filtered when
it has not enough bandwith for the new VM. So the VIM should take bandwidth into
consideration when the scheduler is allocating a VM.
For each host, the VIM should know how much bandwidth is consumed already. Once
a user raises a new VM request, he should also define bandwidth restrict for the
VM.
Once a VM is allocated in a host, the host should substract the new VM's
bandwidth and update its current available bandwidth. Once the current available
bandwidth is collected, from the scheduler side, it should support bandwidth
filter to filter the hosts that has not enough bandwidth and allocate a host
that is viable for the user's request. In this way, the scheduler can use the
bandwidth infomation to allocate a host with enough bandwidth for the user.
1.2 Gap:
OpenStack should support collecting network bandwidth of hosts and existed
instances. In this way, the scheduler can utilize the information to schedule a
new network-sensitive VM in a better way.
Collecting network bandwidth of hosts and existed instances, and creating new
filter possibly named BandwidthFilter that provide the ability to filter hosts
based bandwidth requested by the instance.
The patch https://review.openstack.org/#/c/44007/ added network monitor for
compute, which collect network related metrics like the rates of packets sent or
received for the compute node. But network bandwidth collection, including
physical bandwidth and instance bandwidth used was not taken into account.
2. Ensure Specialized Bandwidth between VMs
2.1 Use case description:
2.2 Gap:
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