Some more information:
Meanwhile I tried to format and mount the disk form an older openSuSE
machine (openSuSE 11.2, kernel: 2.6.31.14-0.4-desktop, openiscsi
version: 2.0.870 revision 28.1), and it worked like a charm. Also
performance is quite good

hdparm -tT /dev/sdb

/dev/sdb:
 Timing cached reads:   3394 MB in  2.00 seconds = 1699.06 MB/sec
 Timing buffered disk reads:  234 MB in  3.02 seconds =  77.37 MB/sec

after that mounting the formatted volume on the openSuSE 11.3 system
(kernel 2.6.34.7-0.5-desktop, openiscsi version 2.0.870 revision 32.1)
also worked, but performance still is terrible:

hdparm -tT /dev/sdb

/dev/sdb:
 Timing cached reads:     2 MB in  2.89 seconds = 707.84 kB/sec
 Timing buffered disk reads:    4 MB in  4.53 seconds = 904.65 kB/sec

I don't dare to use that mount in a production system because of the
still unsolved difficulties with the mkfs.ext4 and the bad
performance. I'm afraid, that under load there will be errors and
malfunction again.

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