Hi I just setup unRaid a couple of weeks ago and I'm still in the process of getting all my disks added to the array and copying over data from my previous NAS. I've been running into an issue with write speed for disks in the array. After a reboot things seem normal, I see between 50-120MB/s write speeds, as time goes on and especially as I've been doing file transfers from my old NAS to unRaid, the write speeds decline eventually ending up in the KB/s range. I've had this happen as I mentioned during file copies (using Krusader for that, and copying direct to the array /mnt/user0 to bypass cache), but I've also had this behavior while running a preclear (using the plugin). I remember when the system was first setup and I precleared my very first disk that the zero phase took about 16hours on an 8TB disk, write speed around 120MB/s. The last disk I precleared the zero phase took about 40hours and write speed started out in the 120MB/s area but declined down into the KB/s area over time.
If I reboot everything goes back to normal and starts the decline in speed all over again.
I'm running unRaid 6.8.3. Diagnostics file is attached
Thanks in advance for help.
diagnostics-20201222-0851.zip