ZFS over ISCSI + Omnios problem

Hmmm, still bad. I test Freenas ISCSI (with Freenas API plugin), and result is similiar as Omnios. NFS OK, iscsi very slow.
Now I am back on Omnios r151028 and will try standart ISCSI (+LVM) connection. (not ZFS over ISCSI plugin)
 
Hi, what cache mode is recommanded for ISCSI?

Testing iSCSI+LVM. result similiar as ZFS over iSCSI.
Only if I chnange cache mode to WriteBack ( on ISCSI disk), I get better result than NFS (WriteBack too). Is Writeback OK for iSCSI?
(Screen attached, disk F: is ISCSI)
 

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