NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Forum Discussion
RN102 USB backup speed usb3 OS6.10.2
I have bought new backup HDD (WD Elements) for my RN102. Started backup of some 3TB but only getting speed of 12MB/s. HD is formatted EXT4. I saw a thread from 2016 talking about slow USB3 backup sp...
piet8stevens wrote:
In total, 6,305 items were copied, for a total of 64 GB in roughly 6 minutes (I looked at the PC clock, did not time the seconds), ie, roughly 180 MB/s.
This was from the NAS? I'm guessing not, because the speed is too high there:
- a gigabit ethernet connection can't carry more than 120 MB/sec with any NAS
- The RN100 series isn't fast enough to deliver more than about 75 MB/s over gigabit ethernet.
So something isn't quite right with the measurement.
Assuming it was a local copy, I'd try doing a copy from the NAS to the USB drive, and see what performance you get. You could also try NasTester ( http://www.808.dk/?code-csharp-nas-performance ). The idea here is to check the performance of the RN102 itself.
FWIW, I don't recommend using ext formatting for backups unless you have another machine that supports ext. A backup you can't read isn't very useful.
Thank you for your reply.
The 6,305 items copies were from the laptop to the backup drive connected directly to the laptop via usb3. Speed is roughly 180MB/s, i.e., a measure for what is possible over usb3, as per the recommendation in your first reply.
Using the same drive from the RN102 to the backup drive connected direclty via a USB3 on the back, it gives the 10-12MB/s
So, the question is why the usb3 on an RN102 for a direct copy is so slow.
piet8stevens wrote:
So, the question is why the usb3 on an RN102 for a direct copy is so slow.
Yes. And one possible reason is that the RAID array is underperforming. That's why I suggested that you test the transfer speed of the NAS itself.
Sorry, you are right - I should have run the test first before replying.
From my Windows 10 laptop, I have run the test over my LAN.
These are the results using the default file size and iterations (400 and 5 respectively):
Iteration 1: 11.61 MB/sec
Iteration 2: 10.70 MB/sec
Iteration 3: 10.60 MB/sec
Iteration 4: 11.46 MB/sec
Iteration 5: 11.06 MB/sec
Average (W): 11.09 MB/sec
Iteration 1: 10.54 MB/sec
Iteration 2: 10.10 MB/sec
Iteration 3: 10.57 MB/sec
Iteration 4: 10.80 MB/sec
Iteration 5: 9.89 MB/sec
Average (R): 10.38 MB/sec
So, it seems it is an issue with RAID read/write times, rather than a usb3 issue. Thank you for providing advice and the link to the testing software.
What can I do about RAID read/write times?
Note: re. my LAN, I used iperf3 to check speed across the network to the NAS, and had about 750-760 MB/s between my desktop and the 2 RN102s, so the speed is not restricted by the LAN. I report between desktop and NAS because I run Ubuntu on my desktop and I have not installed iperf3 on my windows laptop. but the desktop and laptop are connected to the same switch on the network.
piet8stevens wrote:
So, it seems it is an issue with RAID read/write times, rather than a usb3 issue. Thank you for providing advice and the link to the testing software.
What can I do about RAID read/write times?
It does look that way. Since you do have some familiarity with linux, you could check the RAID read speed directly on the NAS with ssh, using dd to copy to /dev/null.
You could also look at the disk health - perhaps using smartctl -x.
If you've never run a balance on the volume, then I do suggest doing that.
NETGEAR Academy
Boost your skills with the Netgear Academy - Get trained, certified and stay ahead with the latest Netgear technology!
Join Us!
