Hi list,

I'm facing a similar problem as what has been discussed here in 2011 :
https://groups.google.com/d/msg/open-iscsi/pQQ8_ernzgQ/7ZVkoDmY2qYJ
but versions have since raised, so I don't know what to look at.

*TL;DR :*
iscsiadm -m node -T iqn.1992-04.com.emc:cx.ckm00094900174.a2 -l
...
...
-> sleeping there until I ctrl-c interrupt it.
The only error msg I get is on the console :
iscsi: invalid session 0
Specifying the SAN ip does not improve anything.

*Long version :*

We have a Dell PE R610 in 64bits with 4 NICs :
- em1 + em2 are bonded and dedicated to the management on a specific VLAN
- em3 and em4 are not bonded, and dedicated to the iSCSI specific VLAN

ping -I from em3 and em4 towards our Cx4-120 SAN is working, towards its 
two different IPs.
And the ping from the SAN is also working.

In /etc/sysctl.conf, I have :
net.ipv4.conf.em3.arp_ignore = 1
net.ipv4.conf.em4.arp_ignore = 1
net.ipv4.conf.em3.arp_announce = 2
net.ipv4.conf.em4.arp_announce = 2
net.ipv4.conf.em3.rp_filter = 0
net.ipv4.conf.em4.rp_filter = 0

iptables and selinux are off.

LSB Version:    
:base-4.0-amd64:base-4.0-noarch:core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-noarch
Distributor ID:    OracleServer
Description:    Oracle Linux Server release 6.6

The discovery sounds good :
root@serv3:/var/lib/iscsi# iscsiadm -m discovery -p 192.168.29.1 -t st -I 
default
192.168.29.1:3260,1 iqn.1992-04.com.emc:cx.ckm00094900174.a2
192.168.29.2:3260,2 iqn.1992-04.com.emc:cx.ckm00094900174.b2

The 2 NICs are NetXtreme II BCM5709 Gigabit Ethernet. They support 
offloading, but I'm not comfortable enough with that yet to play with it. 
So at present, I'd prefer just use a classical tcp transport.

Iface scanning sounds good too :
root@serv3:/var/lib/iscsi# iscsiadm -m iface 
default tcp,<empty>,<empty>,<empty>,<empty>
iser iser,<empty>,<empty>,<empty>,<empty>
bnx2i.f0:4d:a2:07:59:91 bnx2i,f0:4d:a2:07:59:91,<empty>,<empty>,<empty>
bnx2i.00:00:00:00:00:00 bnx2i,00:00:00:00:00:00,<empty>,<empty>,<empty>
bnx2i.f0:4d:a2:07:59:95 bnx2i,f0:4d:a2:07:59:95,<empty>,<empty>,<empty>
bnx2i.f0:4d:a2:07:59:93 bnx2i,f0:4d:a2:07:59:93,<empty>,<empty>,<empty>

Other informations :
root@serv3:/var/lib/iscsi# rpm -qa|grep -i iscsi
iscsi-initiator-utils-6.2.0.873-2.0.2.el6.i686
root@serv3:/var/lib/iscsi# iscsiuio -v
iscsiuio: Version '0.7.6.1', Build Date: 'Wed May 29 14:08:11 PDT 2013'
root@serv3:/var/lib/iscsi# uname -a
Linux serv3 3.8.13-55.1.5.el6uek.x86_64 #2 SMP Wed Jan 28 17:03:28 PST 2015 
x86_64 x86_64 x86_64 GNU/Linux

I tried to disable em4, reboot, and try a connection from a single NIC 
(em3), but that did nothing better.

I don't know if the fact that these NICs support offloading may disturb the 
simplest tcp transport way of connecting?
I must admit I'm a little blocked here, as this is not the first server I'm 
connecting using iscsi, but as the pings are OK, what else could I check?

Thank you.

-- 
Nicolas Ecarnot

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