Nova-volume provides persistent block storage compatible with Amazon's Elastic Block Store. The storage on the instances is non-persistent by nature and hence any data that are generated and stored on the file system on the first disk of the instance are lost when the instance is terminated. You will need to use persistent volumes provided by nova-volume if you want any data generated during the life of the instance to persist after the instance is terminated.
Nova commands can be used to manage these volumes.
Here are a few examples:
