An HCP repository is partitioned into namespaces. A namespace is a logical grouping of objects such that the objects in one namespace are not visible in any other namespace. Namespaces are not associated with any preallocated storage.
An HCP system can have a maximum of 10,000 locally defined namespaces, including one special namespace called the default namespace. Applications are typically written against namespaces other than the default; these namespaces are called HCP namespaces. The default namespace is most often used with applications that existed before release 3.0 of HCP.
Note: Replication can create more than 10,000 namespaces in an HCP system. For information about replication, see Replicating Tenants and Namespaces.