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The OP says they tried the MS iSCSI Initiator (to disprove ESX's iSCSI Initiator), not the MS iSCSI Target. Therefore the problem could still be StarWind. I suppose you can't rule out Starwind completely, but the OP did say that MS target was giving similar results (a few posts down): I've done som...

The OP says they tried the MS iSCSI Initiator (to disprove ESX's iSCSI Initiator), not the MS iSCSI Target. Therefore the problem could still be StarWind.

I must admit I can't seem to break the ~30MB/sec & 25% NIC utilization either. I'm not using anything special. An HP ML115 G5 as an ESXi 4 host, and another running 2008 x64 Server with StarWind installed. Running HDTune Pro 3.50 in an x64 2008 Server VM against a 20GB RDM iSCSI Target yeilds si...