HP Microserver with 4 x Seagate 5900rpm drives set as two software raid mirrors, both MDx in a single Volume Group, one big iSCSI Target, Intel e1000 PCI-e card, dedicated to iSCSI network

Attached to Win Server 2003 R2 via (also) dedicated iSCSI Intel NIC

The iSCSI speed is awful (write ~ 25Mb/s)

It is not Win Server 2003 fault, as is also connect via the same iSCSI network to Thecus i5500 unit

OK, the Thecus has 7200rpm drives & build in HW RAID

But the hardware is now 3 years old, yet it blasts write of excess 100 Mb/sec (that is at least FOUR times faster)

What to do to improve the HP/DSS combo?

Thanks

sebus