opensolaris iscsi target gives 10% performance compared to nexenta

[chris]

I have been testing nexenta against opensolaris 2009.06 as an iscsi target / storage repository for Xenserver 5.6 using the same hardware and vm configuration. The target has two xeon quad-core cpus, 4gb ram and 4 seagate drives with opensolaris on the first and a 1tb volume on other three.

Opensolaris seems to perform very badly compared to nexenta when performing sqlio tests on a Windows 2008 Server R2 virtual machine. The IOs/s and MB/s from opensolaris are apporximately 10% (300 and 20) of the results from nexenta.

Are there tweaks to opensolaris that will increase the iscsi performance and explain the difference in performance?

Thanks,

Chris

sqlio tests I was running

sqlio -kW -t2 -s120 -dM -o1 -frandom -b64 -BH -LS testfile.dat >> sqlioResults-opensolaris
sqlio -kW -t4 -s120 -dM -o1 -frandom -b64 -BH -LS testfile.dat >> sqlioResults-opensolaris
sqlio -kW -t8 -s120 -dM -o1 -frandom -b64 -BH -LS testfile.dat >> sqlioResults-opensolaris
sqlio -kW -t16 -s120 -dM -o1 -frandom -b64 -BH -LS testfile.dat >> sqlioResults-opensolaris
sqlio -kR -t2 -s120 -dM -o1 -frandom -b64 -BH -LS testfile.dat >> sqlioResults-opensolaris
sqlio -kR -t4 -s120 -dM -o1 -frandom -b64 -BH -LS testfile.dat >> sqlioResults-opensolaris