somehow I got stuck: I have a new machine with SLES11 SP1, and I'm trying to 
use openiscsi after a long time (and the first time with SLES11).

Discovery doesn't work for some unknown reason:
# iscsiadm -m discovery -t sendtarget -p name.domain.uni-regensburg.de
iscsiadm: discovery record [name.domain.uni-regensburg.de,3260] not found!

Trying to run iscsid in debug mode seems to suggest that the daemon isn't even 
# iscsid -d8 -f
iscsid: sysfs_init: sysfs_path='/sys'

iscsid: sysfs_attr_get_value: open '/module/scsi_transport_iscsi'/'version'

iscsid: sysfs_attr_get_value: new uncached attribute 

iscsid: sysfs_attr_get_value: add to cache 

iscsid: sysfs_attr_get_value: cache '/sys/module/scsi_transport_iscsi/version' 
with attribute value '2.0-870'

iscsid: transport class version 2.0-870. iscsid version 2.0-871
iscsid: in ctldev_open
iscsid: created NETLINK_ISCSI socket...
iscsid: InitiatorName==iqn.1992-04.de.uni-regensburg.klinik:pcvirtu60.dvm
iscsid: InitiatorName=iqn.1992-04.de.uni-regensburg.klinik:pcvirtu60.dvm
iscsid: InitiatorAlias=pcvirtu60
iscsid: Max file limits 1024 8192

iscsid: in ctldev_close
iscsid: reaped pid 20349, reap_count now 0

As a side-note: "rcopen-iscsi" doesn't want to stop or restart the daemon:
# rcopen-iscsi stop
Stopping iSCSI initiator service:                                    skipped

But the daemon was ruinning:
11442 ?        Ss     0:01 /sbin/iscsid -c /etc/iscsi/iscsid.conf -n
11443 ?        S<Ls   0:03 /sbin/iscsid -c /etc/iscsi/iscsid.conf -n

Do I have to populate the directory /etc/iscsi/send_targets/ by hand?

Maybe it's a configuration error on SLES11 SP1: That directory 
(/etc/iscsi/send_targets/) doesn't exist!

Another side-note: Doing strace on iscsiadm it seems you are using files for 
accieving mutual exclusion:
open("/etc/iscsi/lock", O_RDWR|O_CREAT, 0666) = 3
close(3)                                = 0
link("/etc/iscsi/lock", "/etc/iscsi/lock.write") = 0
/* critical section */
unlink("/etc/iscsi/lock.write")         = 0

Why not use something like open("/etc/iscsi/lock.write", O_RDWR|O_CREAT|O_EXCL, 
and unlink("/etc/iscsi/lock.write")?


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