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

ethtool eth0
*-----------------------------------------------------------------------------*

Settings for eth0:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Half 1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: g
Wake-on: d
Current message level: 0x000000ff (255)
Link detected: yes