I have been able to connect to this iSCSI target before but now I'm getting some weird errors, see attached vdsm.log but in short its about the following:

Thread-161303::DEBUG::2013-03-07 09:54:14,401::task::568::TaskManager.Task::(_updateState) Task=`182a27fe-dfb0-4e68-965e-c77b61050da9`::moving from state init -> state preparing
Thread-161303::INFO::2013-03-07 09:54:14,402::logUtils::41::dispatcher::(wrapper) Run and protect: discoverSendTargets(con={'connection': '192.168.4.234', 'password': '******', 'port': '3260', 'user': ''}, options=None)
Thread-161303::DEBUG::2013-03-07 09:54:14,402::misc::84::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m discoverydb -t sendtargets -I default -p 192.168.4.234:3260 --op=new' (cwd None)
Thread-161303::DEBUG::2013-03-07 09:54:14,428::misc::84::Storage.Misc.excCmd::(<lambda>) SUCCESS: <err> = ''; <rc> = 0
Thread-161303::DEBUG::2013-03-07 09:54:14,428::misc::84::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m discoverydb -t sendtargets -I default -p 192.168.4.234:3260 -n node.startup -v manual --op=update' (cwd None)
Thread-161303::DEBUG::2013-03-07 09:54:14,452::misc::84::Storage.Misc.excCmd::(<lambda>) FAILED: <err> = 'iscsiadm: Cannot modify node.startup. Invalid param name.\n'; <rc> = 7
Thread-161303::DEBUG::2013-03-07 09:54:14,453::misc::84::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m iface' (cwd None)
Thread-161303::DEBUG::2013-03-07 09:54:14,476::misc::84::Storage.Misc.excCmd::(<lambda>) SUCCESS: <err> = ''; <rc> = 0
Thread-161303::DEBUG::2013-03-07 09:54:14,477::misc::84::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m discoverydb -t sendtargets -I default -p 192.168.4.234:3260 --discover' (cwd None)
Thread-161303::DEBUG::2013-03-07 09:54:14,512::misc::84::Storage.Misc.excCmd::(<lambda>) FAILED: <err> = 'iscsiadm: No portals found\n'; <rc> = 21
Thread-161303::DEBUG::2013-03-07 09:54:14,516::misc::84::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m iface' (cwd None)
Thread-161303::DEBUG::2013-03-07 09:54:14,541::misc::84::Storage.Misc.excCmd::(<lambda>) SUCCESS: <err> = ''; <rc> = 0
Thread-161303::DEBUG::2013-03-07 09:54:14,541::misc::84::Storage.Misc.excCmd::(<lambda>) '/usr/bin/sudo -n /sbin/iscsiadm -m discoverydb -t sendtargets -I default -p 192.168.4.234:3260 --op=delete' (cwd None)
Thread-161303::DEBUG::2013-03-07 09:54:14,565::misc::84::Storage.Misc.excCmd::(<lambda>) SUCCESS: <err> = ''; <rc> = 0
Thread-161303::ERROR::2013-03-07 09:54:14,566::hsm::2799::Storage.HSM::(discoverSendTargets) Discovery failed
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/hsm.py", line 2797, in discoverSendTargets
    targets = iscsi.discoverSendTargets(iface, portal, cred)
  File "/usr/share/vdsm/storage/iscsi.py", line 202, in discoverSendTargets
    targets = iscsiadm.discoverydb_discover(discoverType, iface.name, portalStr)
  File "/usr/share/vdsm/storage/iscsiadm.py", line 213, in discoverydb_discover
    raise IscsiDiscoverdbError(rc, out, err)
IscsiDiscoverdbError: (21, [], ['iscsiadm: No portals found'])
Thread-161303::ERROR::2013-03-07 09:54:14,567::task::833::TaskManager.Task::(_setError) Task=`182a27fe-dfb0-4e68-965e-c77b61050da9`::Unexpected error
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/task.py", line 840, in _run
    return fn(*args, **kargs)
  File "/usr/share/vdsm/logUtils.py", line 42, in wrapper
    res = f(*args, **kwargs)
  File "/usr/share/vdsm/storage/hsm.py", line 2800, in discoverSendTargets
    raise se.iSCSIDiscoveryError(portal, e)

Running the commands in a shell indeed gives the errors shown.

I have a wild guess but what interface is -I default referring to?
I had more than one interface activated for this host but moved it to a cluster which didn't have the network definitions and removed the now invalid networks from the host. Just checked with tcpdump and the traffic is going through ovirtmgmt interface and the storage is responding.
/var/lib/iscsi isn't filled with info, only sendtargets/target_ip_address/st_config

Joop
--
irc: jvandewege