manual

[root@rhevm30 ~]# cd /var/lib/iscsi

[root@rhevm30 iscsi]# iscsiadm -m iface -I eth1 --op=new
New interface eth1 added
[root@rhevm30 iscsi]# iscsiadm -m iface -I eth2 --op=new
New interface eth2 added

[root@rhevm30 iscsi]# tree
.
`-- ifaces
    |-- eth1                    <--------------- Local interfaces to provide multipath
    `-- eth2                   <---------------

1 directory, 2 files

[root@rhevm30 iscsi]# iscsiadm -m discovery -t sendtargets -p 192.168.25.118 -I eth1 -I eth2           <--------------- Discovery using both interfaces
Starting iscsid:                                           [  OK  ]
192.168.25.118:3260,1 iqn.2012-07.com.lenovoemc:storage.ix2-73.engine
192.168.25.118:3260,1 iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev33
192.168.25.118:3260,1 iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30           <--------------- Through eth1
192.168.25.118:3260,1 iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev302
192.168.25.118:3260,1 iqn.2012-07.com.lenovoemc:storage.ix2-73.engine
192.168.25.118:3260,1 iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev33
192.168.25.118:3260,1 iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30           <--------------- Through eth2
192.168.25.118:3260,1 iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev302


[root@rhevm30 iscsi]# tree
.
|-- ifaces
|   |-- eth1
|   `-- eth2
|-- nodes
|   |-- iqn.2012-07.com.lenovoemc:storage.ix2-73.engine
|   |   `-- 192.168.25.118,3260,1
|   |       |-- eth1                                             
|   |       `-- eth2
|   |-- iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30
|   |   `-- 192.168.25.118,3260,1
|   |       |-- eth1                                                                              <--------------- Node per interface
|   |       `-- eth2                                                                             <---------------
|   |-- iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev302
|   |   `-- 192.168.25.118,3260,1
|   |       |-- eth1
|   |       `-- eth2
|   `-- iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev33
|       `-- 192.168.25.118,3260,1
|           |-- eth1
|           `-- eth2
`-- send_targets
    `-- 192.168.25.118,3260
        |-- iqn.2012-07.com.lenovoemc:storage.ix2-73.engine,192.168.25.118,3260,1,eth1 -> /var/lib/iscsi/nodes/iqn.2012-07.com.lenovoemc:storage.ix2-73.engine/192.168.25.118,3260,1
        |-- iqn.2012-07.com.lenovoemc:storage.ix2-73.engine,192.168.25.118,3260,1,eth2 -> /var/lib/iscsi/nodes/iqn.2012-07.com.lenovoemc:storage.ix2-73.engine/192.168.25.118,3260,1
        |-- iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30,192.168.25.118,3260,1,eth1 -> /var/lib/iscsi/nodes/iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30/192.168.25.118,3260,1
        |-- iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30,192.168.25.118,3260,1,eth2 -> /var/lib/iscsi/nodes/iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30/192.168.25.118,3260,1
        |-- iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev302,192.168.25.118,3260,1,eth1 -> /var/lib/iscsi/nodes/iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev302/192.168.25.118,3260,1
        |-- iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev302,192.168.25.118,3260,1,eth2 -> /var/lib/iscsi/nodes/iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev302/192.168.25.118,3260,1
        |-- iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev33,192.168.25.118,3260,1,eth1 -> /var/lib/iscsi/nodes/iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev33/192.168.25.118,3260,1
        |-- iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev33,192.168.25.118,3260,1,eth2 -> /var/lib/iscsi/nodes/iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev33/192.168.25.118,3260,1
        `-- st_config

20 directories, 11 files


[root@rhevm30 iscsi]# multipath -ll        <--------------- Nothing yet

[root@rhevm30 iscsi]# iscsiadm -m node -T iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30 -l         <--------------- Login to the target
Logging in to [iface: eth2, target: iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30, portal: 192.168.25.118,3260] (multiple)          <--------------- Two paths
Logging in to [iface: eth1, target: iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30, portal: 192.168.25.118,3260] (multiple)          <---------------
Login to [iface: eth2, target: iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30, portal: 192.168.25.118,3260] successful.
Login to [iface: eth1, target: iqn.2012-07.com.lenovoemc:storage.ix2-73.rhev30, portal: 192.168.25.118,3260] successful.

[root@rhevm30 iscsi]# multipath -ll        <--------------- Now both paths are available and multipath can make its magic.
35005907f318ca6ca dm-2 LENOVO,LIFELINE-DISK
size=50G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 4:0:0:0 sdb 8:16  active ready running
`-+- policy='round-robin 0' prio=1 status=enabled
  `- 3:0:0:0 sda 8:0   active ready running