Several technologies are involved in the use if iSCSI:
Picture 1 delivers an overview over the stack of storage technologies that are used on a KVM host. The information was derived from a host named 'kvm55'. Unless otherwise stated all code examples in this chapter are derived from this host and are compatible with the picture. Picture 1: Overview over devices affected by iSCSI
The numbering of DM devices can change by reboot or during host use. Therefore it is essential to check DM device numbers before any DM access. Never rely in information gained quite a while ago.