A Flavor is defined as a quasi hardware blue-print. This specifies the amount of Memory and CPUs that an instance will have. We have a comprehensive list of flavors which caters most needs and provides flexible sizes.
You can resize an instance to any flavor really more or less on the fly. there will be a 1 second disconnect for the instance to take effect but otherwise there should be no interference. This can be done through the instance menu in Compute -> Instances -> look at the instance and select the drop down menu next to it.
The full list of flavors is as follows:
|Flavor Name||RAM amount MB||Core Amount|