Already tried the tuning at the Open-E Storage and did same tuning for the iscsi HBA at the ESX hosts.
I sure know how to handle the Robin-Round with ESX 4.1

The log only show's the only 407 Errors since I cleared it last this must be about 12h ago.
407 cmnd_abort(1143) errors.

You offered me to send the log files via e-mail - where to send them ?

thx