Hi, I have unRAID 6.7.2 with this hardware

 

AMD Ryzen 7 2700

16 GB RAM

3 WD RED 4TB (one in parity) BTRFS

1 Seagate 2 TB (excluded from shared folder) BTRFS

All tunables in default

 

The problem is, when I copy a bunch of files from Windows 10 1909 to unraid shared folder on WD RED disks it goes perfectly at 112 MB/s, but when it finish to copy one file and starts the next one, it stops like 10 seconds and then continues at 112 MB/s. On the unRAID Dashboard I can see, sometimes one core is at 100%, but not allways

 

What can I do without adding cache to this problem dissapear?

 

Thanks

 

 

 

Edited December 8, 20196 yr by agppro

Sounds like filesystem overhead.  Especially noticeable if you're copying many small files concurrently.  Large files the net time difference isn't significant.

And what I can do for fix?

 

Thanks for your reply

Are you sure it's actually stopped? It happens to me sometime where explorer shows what appears to be a stalled transfer but Unraid writing continuasly, explorer is just not updating real time, you can check on the main page after toggling speed display or with the dynamix stats plugin.

It happens all the time, you can see the Windows 10 task manager statistics

That's not normal, post the diags, maybe something visible there. Also, is this using turbo write?

It fixed!

 

I read the turbo write post and I changed in Unraid -> Settings -> Disk Settings -> Tunable (md_write_method) from auto to reconstruct write

 

Now it fixed completely with small files, and with big files "like 6 GB" now it stops for half second; I understand Is calculating the parity and I think is now normal to the parity system of BTRFS

 

Thank you so much for your attention!