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• put a summary or a brief description of the feature in question 
• list what is deliberately not supported or what the feature will not offer - to clear any prospective ambiguities
• list all open items or unresolved issues the developer is unable to decide about without further discussion
• quality risks (test guidelines)
  • functional
  • non functional: performance, scalability, stability, overload scenarios, etccorner cases and boundary conditions
  • negative usage scenarios
  specify supportability characteristics:
  • what new logging (or at least the important one) is introduced
  • how to debug and troubleshoot
  • what are the audit events list JMX interfaces
• *All virtul network orchestration events
• *VM migration events
  • graceful failure and recovery scenarios
  • possible fallback or work around route if feature does not work as expected, if those workarounds do exist ofcourse.
  • if feature depends other run-time environment related requirements, provide sanity check list for support people to run
• explain configuration characteristics:
  • configuration parameters or files introduced/changed
    New configuration parameter - "vmware.use.dvswitch" of type Boolean. Possible values are "true" or "false". Default value is "false".
  • branding parameters or files introduced/changed - NA
  • highlight parameters for performance tweaking - NA
  • highlight how installation/upgrade scenarios change
• deployment requirements (fresh install vs. upgrade) if any
  • VMware dvSwitch must be already created/configured in the vCenter datacenter deployment.
  • All the host/clusterresources should be added to dvSwitch before adding the cluster to CloudStack's pod cluster.
  system requirements: memory, CPU, desk space, etc

• interoperability and compatibility requirements:
  • Hypervisors - VMware vSphere 4.1 or later
• list localization and internationalization specifications 
  • UI changes in "Add Cluster" wizard. See the section "UI Flow".
• explain the impact and possible upgrade/migration solution introduced by the feature 
• explain performance & scalability implications when feature is used from small scale to large scale
• explain security specifications
  • list your evaluation of possible security attacks against the feature and the answers in your design* *
  explain marketing specifications
• explain levels or types of users communities of this feature (e.g. admin, user, etc)
  • admin
  
  
  • - Administrators would be target audience for this feature as this is at infrastructure level.

Use cases

1. There is a datacenter running vSphere clusters which are using dvSwitches for virtual networking. Migrate those servers into CloudStack cloud.CloudStack should be able to manage virtual networks over dvSwitches seamlessly.
2. Virtual network orchestration during VM lifecycle operations in cloud should use the dvSwitch designated for specified traffic. This includes configuration/re-configuration of distributed virtual port groups associated with the VM over the designated dvSwitch.
3. Live migration of VM within cluster. The traffic shaping policies and port statistics should be intact even after migration to another host within that cluster.

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