RN102 slow performances

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Tibonhomme wrote:

 

it is set right now to 1 Gb/s and not 1 GB/s, could that be the problem ? 

 

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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.

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Tibonhomme wrote:

All right I see, but wouldnt that mean the reading speed should be significantly higher ? 

 

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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?