Looks like you are right, some quick tests made on a iscsitarget linux
server
using nullio and fileio on a sata drive give much better results than the
netapp
file server with it's 12 disks (and while the netapp is directly connected
to the client
and on a jumbo frame network, the linux initiator is contacted thru 2 vlans
and one router in standard frames ...)

netapp:
r...@zeus:~# dd if=/dev/zero of=/dev/sdb bs=4096 count=1251481
1251481+0 enregistrements lus
1251481+0 enregistrements écrits
5126066176 bytes (5,1 GB) copied, 192,076 s, 26,7 MB/s

linux nullio:
r...@zeus:~# dd if=/dev/zero of=/dev/sdc bs=4096 count=1251481
1251481+0 enregistrements lus
1251481+0 enregistrements écrits
5126066176 bytes (5,1 GB) copied, 45,5091 s, 113 MB/s

linux fileio:
r...@zeus:~# dd if=/dev/zero of=/dev/sdc bs=4096 count=1251481
1251481+0 enregistrements lus
1251481+0 enregistrements écrits
5126066176 bytes (5,1 GB) copied, 114,309 s, 44,8 MB/s

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