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RN102 slow performances
Hey there ! Just found out an old RN102 that seem to work, I'm trying to set it up 🙂 I am surprised however as it seems too slow compared to the expected capabilities. I've been trying t...
Tibonhomme wrote:
it is set right now to 1 Gb/s and not 1 GB/s, could that be the problem ?
No, this is correct.
- B is Bytes
- b is bits
so 1 gigabit per second.
You can't set this in the NAS, it is negotiated by the NAS and whatever device it is connected to.
Tibonhomme wrote:
All right I see, but wouldnt that mean the reading speed should be significantly higher ?
It depends on the details.
With SMR drives, the tracks are so close together that when you write to track X, you overwrite X+1. Periodically there is extra space (separating the platter into zones).
So when you write to track x, the drive firmware needs to
- read track x+1
- write track x
- read track x+2
- write track x+1
- ...
until it reaches the end of the zone.
These drives do have a large cache, and they will re-order writes to try to minimize the amount of "rippling" that is needed. But at some point the cache isn't enough, and the performance can become glacially slow (often a lot slower than what you are seeing in the test).
Even when the cache is sufficient, there often is a lot of background "rippling" that needs to be done after your writes finish. Even though that is done in the background, the extra seeks can also slow read speed.
The 15 MB/s speeds you measured are equivalent to about 120 Mb/s (8 bits per byte). That is about the internet speed you measured with Speedtest.
Was this last test done with the PC connected with ethernet? If so, was the ethernet directly connected to the same mesh element as the NAS? Or were you using the mesh wifi backhaul?
Also consider the read/write speeds of the drives. Are you uploading a single large file or many small ones?
Is the NAS connected directly to a mesh unit, or through some other hub/switch? What category are the cables are you using?
"Slow" in what way? The 102 and 104 are the most CPU and RAM limited of the OS6 native NAS and >10 years old. So they are slower than most.
Sandshark wrote:
"Slow" in what way? The 102 and 104 are the most CPU and RAM limited of the OS6 native NAS and >10 years old. So they are slower than most.
Tibonhomme says ~9 Mb/s transfer speed.
Not sure if that is for large file transfers or a lot of small files though. If it is when transfering > 1 GB files then something is definitely wrong.
Hey there,
First of all thank you all for your answers.
Here is the link to the new hard drive i am using :
I am trying to move large file and not large collection of small files (with which a slower transfer speed would be understandable). For example I am moving movies larger than a GB.
I tried changing the ethernet cable with another one but got the same result. The cable I am trying is a 5e category RJ45 so I wouldn't expect it to be the bottleneck reason.
I am not sure on how to check "the link speed of the NAS ethernet (either using ssh or looking at the connection in your router)?" however, do you got any specific instruction that could help me please ?
Thanks !
Kevin.
For the record I was suspicious that the wireless part of my network could be the source of the problem si i wired my computer to the same wifi-mesh node that is connected to the NAS and got about the same result (an average of 10 MB/s).
Also I saw on some treads that the MTU could have an impact so I made sure it was set at 1500 for both my computer and the NAS settings.
Tibonhomme wrote:
While current 1 TB Barracuda drives are CMR, the other sizes (2-8TB) are all SMR. Can you provide the actual drive model? You can see this by going into the NAS web ui, selecting system->volumes, and then hover your mouse over the drive.
This screen shot comes from my own RN102 (which has 1 TB Seagate Ironwolf drives)
One package you can use to test the transfer speed is a program called NasTester
When I test this using a 1 GB file size on my own RN102 I get read speeds around 53 MB/s and write speeds around 71 MB/sec.
Running warmup... Running a 1000MB file write on \\10.0.0.13\Videos 5 times... Iteration 1: 69.75 MB/sec Iteration 2: 71.17 MB/sec Iteration 3: 70.93 MB/sec Iteration 4: 71.71 MB/sec Iteration 5: 71.33 MB/sec ----------------------------- Average (W): 70.98 MB/sec ----------------------------- Running a 1000MB file read on \\10.0.0.13\Videos 5 times... Iteration 1: 53.18 MB/sec Iteration 2: 53.38 MB/sec Iteration 3: 53.64 MB/sec Iteration 4: 53.30 MB/sec Iteration 5: 53.19 MB/sec ----------------------------- Average (R): 53.34 MB/sec10 MB/sec suggests that the ethernet link might somehow negotiating 100 mbps ("fast") ethernet instead of gigabit. You can see the negotiated speed on the NAS by going to the network page in the NAS admin web ui. You'll see a "Bandwidth" field at the bottom left of the page.
But another possibility (particularly for write performance) is that the drive is in fact SMR.
Hey there,
I apologies for the late answer.
Hre is the actual model of the disk, which is the 2TB (so an SMR one, and i didnt actually looked up that spec before buying it).
Please excuse the UI being in french i didnt found how to make it engligh ^^ maybe with your own capture you may compare the fields to understand it ?
The indicated bandwith in the network tab is "1GB/s" (under the ipv4 and 6 adresses) so i assume this wouldnt be the problem here...
I'm not very familiar with CMR Vs SMR differences, how would that change the actual speed ?
Many thanks ! Have a nice day !
Kev'
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