vim-cmd hostsvc/storage/iscsi_add_static_target
Usage: iscsi_add_static_target iSCSIID address name [port]
Add an iSCSI static target entry for an iSCSI Hba.
iSCSIID = iSCSI Device (ie. vmhba32)
address = IP Address of SAN
name = iSCSI Target Name
port = optional
eg:
vim-cmd hostsvc/storage/iscsi_add_static_target vmhba32 10.1.8.100 iqn.2009-04.au.net.eyemedia:sn.mu9re1go
Once you have added the LUNS issue a rescan
esxcfg-swiscsi -s