Im not really sure where you failed i wish you can explain more , but here is a KB that might help you out
VMware KB: VMware ESXi 4.1, Patch ESXi410-201101201-SG: Updates ESXi 4.1 Firmware
And drivers page :
ftp://ftp.dell.com/Pages/Drivers/powervault-md1000.html
Best regards
Yours, Oscar