Reverse-Sync is when an action or job is executed inside your VMWare environment (VCSA, VCD, NSX) and Hyalto reflects that change inside the portal. The process, however, differs depending on the environment. Here are the procedures for each environment and how Reverse-Sync is achieved.
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Both vCloud and NSX uses the messaging protocol AMQP to send messages back and forth to Hyalto. These messages tells tell Hyalto what action to apply to any object whether its power on a VM, delete a vApp or add a firewall rule. It can also show changes made at the System level, for example, adding a datastore, removing a distributed port group, or modifying a an external network.
This works only if you have setup Hyalto to use the same AMQP service that vCloud/NSX is using and you are using a different username other than administartor@system.
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Unlike vCloud and NSX, vCenter does not use a messaging protocol to send out any actions or jobs done by vCenter. So Hyalto has a built-in service that will fetch any changes in vCenter and apply them to Hyalto. The script will run every 15 5 minutes on the hour (:00, :1505, :3010, and :45:15, etc...).
So if you power on a VM in vCenter at 7:25pm22 pm, the action will reflect in Hyalto at 7:30pm25 pm.
This service also works for System actions as well. For example, if you added a datastore at 3:47pm47 pm, the new datastore will show up in Hyalto at 43:00pm50 pm.