Hallo Nicolas, i have recompiled a new kernel with the code patch you proposed. Unfortunately this doesn't do the job, the result is as before. (based on http://git.kernel.org/?p=linux/kernel/git/nab/lio-core-2.6.git, version 3.1-rc10 ) To be able to give you some more information, I cut a lan trace (tcpdump -w) containing the iSCSI session between the ESXi system and the iSCSI target. Maybe it gives you some more information on what is happening. The lan trace can be found here: http://dl.dropbox.com/u/48381679/LIO%20Lan%20Trace%20write%20same%20issue%20with%20ESXi%205.0.cap The initial iSCSI connection is setup starting with packet 286 The copy command kicks-in at packet 42034 The first write same access to the LUN starts at packet 42954 Please let me know how I can support to get this topic solved. Many thanks in advance for your support, Sven -- To unsubscribe from this list: send the line "unsubscribe target-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html