+Names of storage classes are internal to the cluster and decided by the administrator. Aside from "default", Arvados currently does not define any standard storage class names. Consult your cluster administrator for guidance on what storage classes are available to use on your specific Arvados instance.
+
+Note that when changing the storage class of an existing collection, it does not take effect immediately, the blocks are asynchronously copied to the new storage class and removed from the old one. The collection field "storage_classes_confirmed" is updated to reflect when data blocks have been successfully copied.