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by ister Nov 5, 2017
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can't open any of the files, is there a chance you can change them into stl please

How's the noise level?

The 2 slot 2 disk NAS is not noisy. It has a 12V fan and rubber feet.
The 6 slot 5 disk NAS is noisy, it has a 240V maglev fan and it has some vibrations and noise.

What software do you run on the raspberry pi?
Is that a specific distribution for headless use?

sorry my friend for not replying, I wanted to copy the exact version but forgot.
For rpi I used rasbian if I remember correctly, the only problem was the LVM kernel driver that did not load during boot, therefore I had to add an /etc/rc.local command to load it and then mount the partitions.

For the Odroid I used the experimental version with the latest kernel, downloaded from the odroid forum/wiki site. If I remember to check the exact version I will add a reply

One question what is the speed using the usb hub ?

further on the performance, in the 4 disk RAID5 with one spare disk there was a failure yesterday and it started automatically recovering:
Personalities : [raid6] [raid5] [raid4]
md127 : active raid5 sdc1[6] sdd1[3] sdb1[5] sda1[7]
5860144128 blocks super 1.2 level 5, 1024k chunk, algorithm 2 [4/3] [UU_U]
[===========>.........] recovery = 55.2% (1078799692/1953381376) finish=169.5min speed=85980K/sec

it dropped from 86MB/sec to 64MB/sec when there was traffic from client PCs.

The following best describes the usb hub speed and connectivity. In summary it is all 5GBps USB 3.0 speeds in all hub ports (shared).

root@nas1:~# lsusb -t
/: Bus 04.Port 1: Dev 1, Class=root_hub, Driver=xhci-hcd/1p, 5000M
| Port 1: Dev 2, If 0, Class=Hub, Driver=hub/2p, 5000M
Port 1: Dev 3, If 0, Class=Hub, Driver=hub/4p, 5000M
| Port 2: Dev 5, If 0, Class=Mass Storage, Driver=uas, 5000M
Port 3: Dev 7, If 0, Class=Mass Storage, Driver=uas, 5000M
| Port 4: Dev 9, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
Port 2: Dev 4, If 0, Class=Hub, Driver=hub/4p, 5000M
| Port 3: Dev 8, If 0, Class=Mass Storage, Driver=uas, 5000M
Port 4: Dev 10, If 0, Class=Mass Storage, Driver=usb-storage, 5000M
|__ Port 2: Dev 6, If 0, Class=Mass Storage, Driver=uas, 5000M

if you are asking the actual end-to-end speed then I have some metrics but are not very reliable and I cannot verify them as the NAS is used by many servers (has only one failure in 6 months of continuous use). The metrics over SMB when I first prepared are 10MBps with the default configuration of SAMBA and 72.7MBps with optimised SAMBA socket and buffer options.

Ok good to know I'm waiting for my odroid to make my NAS.

Let me know if I forgot to upload any files.
I used a Maglev 220V(EU) fan to reduce the noise and temperature. It is still a bit noisy. I live in Greece (warm country) keep the NAS in a bookshelf and had no melting part issues.
I tried to investigate why the disk failed in the mentioned configuration and recovery (see previous message), I identified which disk failed, removed it, inserted it in a PC and it worked fine. Tried to add it again on the same NAS slot and no success. Restarted (with shutdown -r now) the NAS and still it did not work. Then I shutdown, unplugged the NAS from power socket and restarted. It did work. The conclusion is that it was a failure of the USB2SATA interface and it seems that 12V still keeps its electronics running. You might want to experiment with different USB2SATA interface but you will have to re-design the USB2SATA mount part.
Also if I remember correctly I had to install the odroid latest kernel (4.x.y if I remember correctly, I used a beta distribution from the official site) but I cannot remember the reason.

ok i'm waiting for this
and maybe i'm doing the case for the NAS in metal because I have one cnc punching machine, a waterjet machine and a bending machine at work:
question what is making the heat the odroid or the drives ?