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Forum Discussion
Very Slow Performance on RN104
Hello, I just plugged in 3x3TB HDD into ReadyNAS 104, but transfer files is around 7MB/s. I think this should be much much higher. RN104 is in RAID0 configuration to increese performance, but with ...
thanks for the recommendation and advice.
I finally have the problem solved recently.
Among couple of things I did was to use separate power socket extender for powerline home plug and computer - guess that solved noise for powerline.
Second I updated NAS firmware to OS 6.1.8.
Third I use other wall socket since I noticed some wall socket are slightly 'noiser' than other because powerline home plug link indicator turn to orange/red frequently.
Below is the speed i achieve copying file from PC to NAS with connection: PC Ethernet LAN port -> Powerline home plug ->Powerline home plug -> 100Mbps router -> NAS
That's about 60Mbps!
I'm quite happy with this speed now as I read this article, i'm about there correct.
http://msdn.microsoft.com/en-us/library ... 10%29.aspx
You can calculate the theoretical maximum in the following way for the 100baseT Ethernet:
100BASE-T is clocked at 100 MHz, with a 25-MHz crystal multiplied by 4. The coding is 8/10, meaning one byte is packaged into 10 bits. Therefore, you can at most transfer 100/10=10 million bytes per second. To convert this number to megabytes per second (MBps), divide it in the following way:
10,000,000/(1024*1024)=9.5 MBps
Then there is the question of efficiency. Ethernet provides up to 90-95% efficiency (CSMA-CD). There is a maximum payload of about 1500 bytes per frame, and some minimum inter-frame spacing. Also, if you use half-duplex cabling, the ACK packets must take the bus sooner or later, making it almost impossible to reach the maximum.
The frame format for 802.2 over Ethernet is at maximum 1487 bytes, or 1484 depending on the Ethernet standard used IEEE, or DIX.
I finally have the problem solved recently.
Among couple of things I did was to use separate power socket extender for powerline home plug and computer - guess that solved noise for powerline.
Second I updated NAS firmware to OS 6.1.8.
Third I use other wall socket since I noticed some wall socket are slightly 'noiser' than other because powerline home plug link indicator turn to orange/red frequently.
Below is the speed i achieve copying file from PC to NAS with connection: PC Ethernet LAN port -> Powerline home plug ->Powerline home plug -> 100Mbps router -> NAS
That's about 60Mbps!
I'm quite happy with this speed now as I read this article, i'm about there correct.
http://msdn.microsoft.com/en-us/library ... 10%29.aspx
You can calculate the theoretical maximum in the following way for the 100baseT Ethernet:
100BASE-T is clocked at 100 MHz, with a 25-MHz crystal multiplied by 4. The coding is 8/10, meaning one byte is packaged into 10 bits. Therefore, you can at most transfer 100/10=10 million bytes per second. To convert this number to megabytes per second (MBps), divide it in the following way:
10,000,000/(1024*1024)=9.5 MBps
Then there is the question of efficiency. Ethernet provides up to 90-95% efficiency (CSMA-CD). There is a maximum payload of about 1500 bytes per frame, and some minimum inter-frame spacing. Also, if you use half-duplex cabling, the ACK packets must take the bus sooner or later, making it almost impossible to reach the maximum.
The frame format for 802.2 over Ethernet is at maximum 1487 bytes, or 1484 depending on the Ethernet standard used IEEE, or DIX.
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