Readynas Duo v2 poor performance on SMB connection

30 MB/s is way more than you need to stream a 1080p movie btw. BluRay is limited to 54 mbits (7 MB/s). 1080p downloads are typically around 8-10 mbits. (2 MB/s). So even 10 MB/s is more than enough to stream 1080p. If you are seeing stuttering or rebuffering, than that is due to something else (media issues, or possibly packet loss) - not the raw connection throughput.

Can you confirm that the duo is negotiating a gigabit connection? 10 MB/s is usually what you see on fast ethernet (100 mbit)

Also, if Anti-virus is off, the RN104 should be delivering about 2x the read speed you are getting.

Thank you for your fast reply.

You are right, probably I should upgrade my HTPC :oops: , but my problem is essentially with file moving between DUO v2 NAS, client and USB disks. The 104 work flawlessy, except whe the temperature of the CPU goes till 80°C, but I have found in the forum a small script to increase

Here my result, not based on software testing but real life esperiment:
- ReadyNas DUO v2 - USB 2.0 disk: 20-25MB/s
- ReadyNas DUO v2 CIFS: average 27MB/s
- ReadyNas DUO v2 SMB: average 10MB/S

Type of file: from 500KB to 15GB

The 104 is fine for streaming, I just reported it as an example of good connection speed between my machine. I verified the performance of the duo v2 with desktop client sharing the same gigabit switch (netgear) and the same cable (BTW I use 50cm short cable).

The only thing I do not undestand is the difference in performance between CIFS and SMB even on Unix machine.

Since you are getting 20-30 MB/s with other protocols, the network connection must negotiated as gigabit.

Do you have a windows PC that you can use to test SMB? Also it might be worth doing a direct connection (directly connecting the ethernet cable between the PC and the NAS, and using static addresses to to connect). You don't need a crossover for that, your existing cables will work.

What model switch are you using? Do you know if it supports 802.3x flow control?

Duo v2 can do 90+MB/s SMB read on large file in my setup, clients need to fast enough.

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wli wrote:
Duo v2 can do 90+MB/s SMB read on large file in my setup, clients need to fast enough.

I agree it should be faster than 30, that was why I was asking about the connection details.

90 sounds too high though. Maybe you could confirm with Nastester (http://www.808.dk/?code-csharp-nas-performance)

StephenB wrote:
Do you have a windows PC that you can use to test SMB? Also it might be worth doing a direct connection (directly connecting the ethernet cable between the PC and the NAS, and using static addresses to to connect). You don't need a crossover for that, your existing cables will work.

I made different test with this configuration:
- PC with Ubuntu 14.04
- PC with Windows 7 SP1
- PC with Windows 8.1
- Static IP both for PC and NAS
- PC and NAS attached to the same switch, no other component attached
- Test performed with only 2 system connected (PC and NAS)
- SMB oplock mode enabled, no jumbo frame enabled, even it is supported by all components, switch included.

My home LAN is adopting this configuration: fiber router - physical firewall (appliance) - Backbone with a Gigabit Netgear GS105 switch - Netgear GS108GE reserved only to NAS and PC. Any unwanted "interference" should not be present within internal LAN with this configuration.

My concern is about the difference between the two protocol: CIFS perform 3 times better even with Linux desktop where SMB should be considered more efficient.

StephenB wrote:
What model switch are you using? Do you know if it supports 802.3x flow control?

Netgear GS108GE ProSafe Switch, 8 port, Gigabit

http://www.netgear.co.uk/business/products/switches/unmanaged/GS108.aspx#tab-techspecs

No flow control support according to its specification.

wli wrote:
Duo v2 can do 90+MB/s SMB read on large file in my setup, clients need to fast enough.

I tried with different system and configuration, with the same result. i use SMB to share file with a HTPC, but I think this is the source of the shuttering and lagging.

Are you saying the two windows machines are also testing out at 10 MB/s?

Have you tried NAStester to check speeds on the windows machines (http://www.808.dk/?code-csharp-nas-performance)?

All the machine connected perfom the same with a Samba share. The test have been performed downloading/uploading different file (from 500KB to 15GB). File size seems not related with the results.

I just downloaded yesterday NAStester and I will use it this evening. Tomorrow I hope I will be able to post some results.

Great. I also recommend that you test using a direct connection between one of the Windows systems and the NAS (taking the switches out of the equation).

It would be good to rule in/out the equipment on the network path, and that is the best way to do it.