Block storage
Using shared storage for ephemeral storage is one way to achieve a persistence capability for virtual instances, but the more traditional way is to instantiate a Glance image on a Cinder volume. Instances that are backed by Cinder volumes can be live-migrated, live-snapshotted, and evacuated with their state intact. There are Cinder drivers for almost every major storage product on the market these days, and it is common to configure multiple backends within a single OpenStack deployment. This allows the OpenStack tenant to choose an appropriate backend for their workload. For example, a database instance might have its operating system reside on a relatively inexpensive ephemeral disk, but locates the data on a highly performant ...
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