I have recently added dual parity drives into my array. Things start off good running around 100MB/s but then after a few hours things tank down to 10MB/s or lower with a build time of weeks. have dug around but not seeing anything major that is running pulling resources. 

 

 

 

unraidprimary-diagnostics-20200719-1918.zip

And now we are back up to acceptable speeds? 

 

It might be worth installing the DiskSpeed docker to see if any of your drives have a ‘slow’ patch.

 

parity check would also slow down significantly if there is any reading/writing of files on the array at the same time.

will grab diskspeed and check. I have paused all of my file transfers too and from for the time being trying to get it to speed up. 

 

I would expect around a day or day and a half to complete 10TB parity but not weeks. 

Edited July 19, 20205 yr by eric.stammen