I am uploading from my laptop to the RadyNas Ultra 4 plus. Connected on the Wire. Netgear gigabit switch in between.I am using filezilla to upload (ssh)I am getting 1-2MB/s steady.is this bad? is there anything i can do to get it higher?the nas has a 3TB western digital green caviar disk drive.what would be the bottleneck?

Check the MTU size on your laptop's NIC to ensure packets are not being fragmented over the network.You might also want to check the auto-scaling feature of Windows if your using Vista / 7. Auto scaling attempts to increase the MTU of the machine incrementally when Windows detects it can support a higher MTU than currently set. There sre two issues with this approach as far as I can see; Firstly the constant checking generates additional traffic, and secondly any packets lost due to failed attempts at raising the MTU of the source machine will affect write performance to the NAS as those packets need to be re-sent. The NAS itself can intelligently negotiate it's packet size down to a level that it's packets are not fragmented en-route to your PC. However, if your PC is constantly attempting to raise this value (and failing) your read/write performance will suffer. It's because of this auto-tuning feature in Windows Vista / 7 (which was designed to stop people having to adjust MTU's manually) that performance can suffer over wireless connections. A desktop wired NIC will respond quicker than a wireless one in my experience and so adjust for changes in MTU easier than the wireless connection, which also has to deal with other considerations like signal strength and interferance.1-2MB/s is about what you can expect for Wireless-G, but you should expect 8-10MB/sec for a wired 10/100 ethernet connection and faster for Gigabit connections (depending on the NAS / Switch / Router used on your network). Also, it's likely that your router won't support jumbo frames, even if your desktop PC and the NAS do. Most consumer Netgear routers for example don't support jumbo frames. But by adding in a network switch and connecting your NAS and PC to that via Gigabit LAN, you bypass the router, which will then only be responsible for assigning an IP address to those devices if your using DHCP. Any subsequent communications between the Gigabit-enabled PC and the NAS ought to go direct to each other via the switch. I bought one for exactly this purpose.Search Google for instructions on how to set your MTU under Windows and look into either "restricting" or totally disabling the auto-tuning feature of Vista / 7 if that's what you desire. There are also other TCP settings that can be adjusted at the same time such as side-scaling, chimney offload and congestion detection, but these features (and your ability to use them) will depend on the hardware your using. your main concern is restricting the auto-tuning feature and getting a good MTU size, and then you should see much improved performance.

One other thing to consider: File sizes. Small files will transfer slower than large files sizes as there is less time for the connection to ramp up to full speed before the end of the file is reached. But either way, on a Gigabit LAN connection, with the hardware you've specified, you should be getting at least 40-50MB/sec upload to the NAS. That's the sort of speeds I see via my network meter gadget (if those speeds are to be believed). Using IOMeter is another option to measure upload/download speeds to the NAS.

well right now i'm uploading a 4.5GB movie (compressed in 59 rar files) on the wired connection and it's uploading 2 x1.3MB/s. (2 files at a time)I have jumbo frames enabled on my NIC with 9KB MTU and enabled jumbo frames on my NAS.something must be wrong. i will try and disable auto tuning on my windows 7 client and report back.These are my TCP settings:TCP Global Parameters----------------------------------------------Receive-Side Scaling State : disabledChimney Offload State : disabledNetDMA State : enabledDirect Cache Acess (DCA) : disabledReceive Window Auto-Tuning Level : disabledAdd-On Congestion Control Provider : noneECN Capability : disabledRFC 1323 Timestamps : disabled

replaced a bad ethernet cable, and connected direct from laptop (wired nic) to NAS, configured static ip on both. enabled jumbo frames on both nici am now getting up to 10MB/s upload to NAS using filezille sftp sshdo you think i should still be able to get about 30-40 MB/s ? I can't think what else I could do.

put the switch back in the mix - getting up to 10 MB/s upload still ...

uploading to NAS over gigabit LAN speeds good?

16 Replies

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mdgm-ntgr
NETGEAR Employee Retired
Nov 22, 2011
So just the one disk installed (the 3TB disk)?
dirkdigs
Aspirant
Nov 22, 2011
yes.

i think i found the problem. when a drag and drop (smb) i am getting 50+ MB/s. It's only when using filezille and sftp that I get limited to the 10 MB/s
StephenB
Guru - Experienced User
Nov 23, 2011
What speeds do you get with ordinary FTP? I am wondering if the encryption is slowing things down (this could be a filezilla slowdown also).
gibxxi
Guide
Mar 06, 2012
I Use SmartFTP and have done for years (since before it went to a paid model).

Transfer rates over SmartFTP are comparable to transfers over Windows Explorer, and it supports all the modes your ever likely to need to connect to your NAS (FTP, SFTP, SSH, etc).

Flow control is enabled on my Desktop NIC (Onboard Realtek 8111D) and jumbo frames set to 9k (MTU works out to 8147 - 8119 plus 28 bytes for headers) but for this to work with the NAS, jumbo frames has to be enabled on the NAS too.

A guide on setting up / determining your correct MTU can be found here:
http://www.richard-slater.co.uk/archive ... windows-7/

I ended up writing a batch file to automate the process. I also enabled the other settings I already mentioned like chimney offload, ECN, DMA, etc. With Jumbo frames disabled I get a steady throughput of about 40-50MB/Sec, with jumbo frames enabled I get 75-80MB/Sec. With a dedicated NIC with an onboard processing chip I could probably expect more still, but I think Realtek chips use the system CPU for processing (Both audio & networking) which can limit the throughput depending on the CPU loading at the time.
tiranor
Aspirant
Mar 20, 2012
I'm curious, my ultra4, since purchase, can't transfer faster than 45MB/s over SMB/CIFS (Seven 64bits). When using benchmark softwares, i manage to reach more than 80MB/s.

Today, i tried the FTP transfer, and i have 2 cases (files are over 5-10GB) on each file : either the NAS caps at 50-55MB/s, either it flies at 90-95MB/s (during all the transfer).

Is the SMB/CIFS management that slow compared to the FTP ?

Any ideas about this weird behavior ?
gibxxi
Guide
Aug 31, 2012
Might be something to do with Oplocks / Caching, but I don't know enough about SMB/CIFS to be sure.

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uploading to NAS over gigabit LAN speeds good?

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