In short:

------------------------------------------------------------------------------------
Case A
Initiator: IBM x3550 (two NICs),  /dev/sda (local disk),  100-120 MB/s
(hdparm -t /dev/sda).
Target:    Dell (only one NIC),   /dev/sda (local disk), dev/sda (IET
disk),70-90 MB/s(hdparm -t /dev/sda)

when login with iscsi, open-iscsi find new attached disk /dev/sdb,
remote reading speed is less than 10 MB (hdparm -t /dev/sdb)   (*)


------------------------------------------------------------------------------------
Case B
Initiator: Dell (only one NIC),    /dev/sda (local disk),  70-90 MB/s
(hdparm -t /dev/sda).
Target:    IBM x3550 (two NICs),   /dev/sda (local disk),  dev/sda
(IET disk),100-120 MB/s(hdparm -t /dev/sda)

when login with iscsi, open-iscsi also find new attached disk: /dev/
sdb, remote reading speed is about 80 MB/s(hdparm -t /dev/sdb)  (**)


------------------------------------------------------------------------------------
Case C
Initiator: ThinkPad x61 notebook (one NIC),  /dev/sda (local disk),
50-60 MB/s (hdparm -t /dev/sda).
Target:    Dell (only one NIC),              /dev/sda (local disk),
dev/sda (IET disk),70-90 MB/s(hdparm -t /dev/sda)

when login with iscsi, open-iscsi find new attached disk /dev/sdb,
remote reading speed is about 40-50 MB (hdparm -t /dev/sdb)   (***)


------------------------------------------------------------------------------------
Case D
Initiator: Dell (only one NIC),               /dev/sda (local disk),
70-90 MB/s (hdparm -t /dev/sda).
Target:    ThinkPad x61 notebook (one NIC),   /dev/sda (local disk),
dev/sda (IET disk),50-60 MB/s(hdparm -t /dev/sda)

when login with iscsi, open-iscsi find new attached disk /dev/sdb,
remote reading speed is about 50 MB (hdparm -t /dev/sdb)   (***)

-----------------------------------------------------------------------------------

That is what confused me.
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