iscsi?
Seriously? For a rootvg WPAR? "The support of devices in the WPAR is
limited to fiber-attached storage devices, fiber channel adaptors, and
virtual Small Computer System Interface (SCSI) disks".
https://www.ibm.com/support/knowledgecenter/ssw_aix_71/com.ibm.aix.wpar/wpar-storage.htm
Maybe
on 6.1, but on 7.1 I get this error even though these filesets are
installed. The iscsi targets are provided by Linux (Debian 8 and
Testing, amd64). Lio works flawless for all my AIX hosts, except that I
cannot create wpars on 7.1.