Hello, i'm a bit new to Unraid,

just want to know it this is normal behavior, or maybe my hardware is too outdated.

 

When i start a transfer, it's starts good at 75MB/s+, but quickly drops to around 30MB/s

I also notice CPU usage is at 90%+ constant when transfering.

Using an old E6850 CPU... but i have a E8850 lying around if it makes any difference.

 

I'm not using a "cache" drive.

 

Thanks for any tips.

tower-diagnostics-20230819-1333.zip

Edited August 19, 20232 yr by bodyblind

Try turbo write.

Thanks for the tip, this helped a lot.. 

Write speed is now around 60+MB/s, a lot better then 30

 

Is this a speed that is acceptable? my old Synology NAS (wich now is broken) did 100+MB/s with the same disks. (not sure if it's a fair comparison)

Or are there more i can do to increase the speed? (adding a cache-drive? upgrading CPU?)

for that old CPU speeds are ok. 

with newer/faster cpu 100MB/s is no problem.

unRAID is different than other raid's. what type of raid you have on synology ?

 

Adding Cache drive is good option but you need to remeber that data on cache drive isn't protected unitl mover writes them to array.

 

Better cpu are important too - i get >100MB/s writing to array (share without cache)

Edited August 19, 20232 yr by Raptor

On my synology, i ran "Synology Hybrid raid" (SHR)

Do you think upgrading from E6850 to E8850 will make a huge difference? or will i have to purchase modern parts?

1 hour ago, bodyblind said:

On my synology, i ran "Synology Hybrid raid" (SHR)

Do you think upgrading from E6850 to E8850 will make a huge difference? or will i have to purchase modern parts?

you may find this section of the online documentation of interest in understanding what applies performance constraints in Unraid.

Unraid doesn't stripe data for the array, so write speed can never be faster than single disk speed, still with the disks you have it should get closer to 100MB/s+, when writing to the beginning of a disk with turbo write, assuming no controller bottlenecks.