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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:
Any ideas what I can do to increase this backup speed?
First of all, use the rear USB ports instead of the front one. The rear ports are USB 3.0, the front is USB 2.0
You might also want to connect the disk to a PC (reformatting it of course), and then testing disk performance there. Maybe try to copy the same folder over an ethernet connection, and see what speed you get.
Hello, thank you for our reply.
The speeds I reported are from the back USB3 ports. I had the RN102 reformat the HDD to ext4.
When I connect the drive directly to my laptop (windows 10) via USB3, I get copy speeds between 10 and 210 MB/s, depending on file size. Here, the hdd is formatted NFS. 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.
I copy from an SSD on the laptop.
On the NAS, I have WD Red drives in raid 1. The HDD I copy to is a WD green one.
So, on the laptop, the speed is roughly 18x faster than on the NAS. That seems to be quite a factor!
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.
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