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Write performance / Gigabit Ethernet slow with unRAID

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Hi ,

 

I installed unRaid 6.8.3 on a Thecus N5550.  

 

Overall I love it.  BUT, the Thecus used to easily supply 113 MB/s in either direction when writing/reading.

 

Now it will read at ~108MB/s, but writing is usually bouncing around 50-80MB/s.  This is with a Samsung 860 PRO SSD setup as a cache, which seemed to make no difference in write performance.

 

Why so slow?  Do I have a setting set wrong?

unraid-diagnostics-20210416-1431.zip

Edited by Belgian Genius

  • Belgian Genius changed the title to Write performance / Gigabit Ethernet slow with unRAID
  • 2 months later...
  • Author

Really?  So no one has any idea about this?

10 minutes ago, Belgian Genius said:

Really?  So no one has any idea about this?

 

You didn't provide your diagnostics zip. Without it all anyone can do is guess.

 

You can test network performance with iperf3 (install it using the NerdPack plugin) and you can test disk read (not write) performance with the DiskSpeed docker container. Are you sure writes are actually going to the cache?

 

  • 3 weeks later...
  • Author
On 4/3/2021 at 10:45 PM, John_M said:

 

You didn't provide your diagnostics zip. Without it all anyone can do is guess.

 

You can test network performance with iperf3 (install it using the NerdPack plugin) and you can test disk read (not write) performance with the DiskSpeed docker container. Are you sure writes are actually going to the cache?

 

Is it possible for them not to go to the cache

52 minutes ago, Belgian Genius said:

Is it possible for them not to go to the cache

 

That depends on your configuration. As I said,

 

On 4/4/2021 at 3:45 AM, John_M said:

You didn't provide your diagnostics zip. Without it all anyone can do is guess.

 

  • Author

Diagnostics added to original post.

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