Nice try...
The problem is with iSCSI only. with samba performance is OK.
In any case here are the values you asked for:
*-----------------------------------------------------------------------------*
hdparm -t /dev/cciss/c0d1
*-----------------------------------------------------------------------------*
/dev/cciss/c0d1:
Timing buffered disk reads: 148 MB in 3.01 seconds = 49.14 MB/sec