In a Fibre Channel or iSCSI environment, you must define LU paths and associate host groups or iSCSI targets with logical volumes. For example, if you associate a host group or an iSCSI target consisting of three hosts with logical volumes, LU paths are defined between the three hosts and the logical volumes.
You cannot define an LU path to the following types of volumes:
- Journal volumes
- Pool volumes
- External volumes with the data direct mapping attribute
- Deduplication system data volumes
Caution: If the command to configure an LU path is run on an LDEV with the command device attribute set by specifying an existing LU path, the command device attribute is removed.