Да вот как бы была такая мысль.
Где тут какая то пятиуровневая...
IQN (iSCSI qualified name). Can be up to 255 characters long and has the following format:
The year and month when the naming authority was established.
Usually reverse syntax of the Internet domain name of the naming authority. For example, the iscsi.vmware.com naming authority could have the iSCSI qualified name form of iqn.1998-01.com.vmware.iscsi. The name indicates that the vmware.com domain name was registered in January of 1998, and iscsi is a subdomain, maintained by vmware.com.
unique name Any name you want to use, for example, the name of your host. The naming authority must make sure that any names assigned following the colon are unique. For example, iqn.1998-01.com.vmware.iscsi:name1.