Readynas 104 - Slow transfer speeds

Dear all,

I recently lost all my data to corruption of the array of my RN104. I've since then recreated an entirely new NAS based on NASware 4.0 TB drives in RAID5.

I have also thoroughly searched for improvements in transfer speeds : my ISP box provides 1Gbit so I've connected both my PC through a  10m CAT5E RJ45 cable and the NAS through a  3m CAT6 RJ45 cable to the box.

Now upon searching in the forum, I discovered a previous thread where it was advised to use NASTester for testing perf, as well as iperf3.

Here is the NASTester log:

NAS performance tester 1.7 http://www.808.dk/?nastester
Running warmup...
Running a 400MB file write on X: 5 times...
Iteration 1: 35,63 MB/sec
Iteration 2: 36,08 MB/sec
Iteration 3: 35,42 MB/sec
Iteration 4: 34,20 MB/sec
Iteration 5: 35,71 MB/sec
-----------------------------
Average (W): 35,41 MB/sec
-----------------------------
Running a 400MB file read on X: 5 times...
Iteration 1: 64,35 MB/sec
Iteration 2: 63,48 MB/sec
Iteration 3: 62,23 MB/sec
Iteration 4: 62,55 MB/sec
Iteration 5: 65,32 MB/sec
-----------------------------
Average (R): 63,59 MB/sec
-----------------------------

and here is the iperf3 from the nas to the PC:

root@miniNAS:~# iperf3 -c 192.168.1.30
Connecting to host 192.168.1.30, port 5201
[ 4] local 192.168.1.10 port 43260 connected to 192.168.1.30 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.01 sec 112 MBytes 928 Mbits/sec 0 215 KBytes
[ 4] 1.01-2.00 sec 111 MBytes 937 Mbits/sec 0 215 KBytes
[ 4] 2.00-3.00 sec 110 MBytes 927 Mbits/sec 0 215 KBytes
[ 4] 3.00-4.00 sec 112 MBytes 936 Mbits/sec 0 215 KBytes
[ 4] 4.00-5.00 sec 110 MBytes 922 Mbits/sec 0 215 KBytes
[ 4] 5.00-6.00 sec 112 MBytes 936 Mbits/sec 0 215 KBytes
[ 4] 6.00-7.00 sec 111 MBytes 935 Mbits/sec 0 215 KBytes
[ 4] 7.00-8.01 sec 112 MBytes 932 Mbits/sec 0 215 KBytes
[ 4] 8.01-9.00 sec 111 MBytes 936 Mbits/sec 0 215 KBytes
[ 4] 9.00-10.00 sec 111 MBytes 932 Mbits/sec 0 215 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 1.09 GBytes 932 Mbits/sec 0 sender
[ 4] 0.00-10.00 sec 1.08 GBytes 932 Mbits/sec receiver

iperf Done.

Clearly the iperf3 seems to give a correct 1Gbit speed, while the NASTester shows asymetric read & write speeds .. While I'm above a 100Mbits, it's not really the 90-100MB/s I'd like to see.

Any clue on what to look at for solving this?

Thanks