Slow transfer speed, high CPU usage. Unraid 6.12.3

[bodyblind]

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just want to know it this is normal behavior, or maybe my hardware is too outdated.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, 2023 by bodyblind

[JorgeB]

Try turbo write.

[bodyblind]

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?)

[Raptor]

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, 2023 by Raptor

[bodyblind]

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?

[itimpi]

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.

[JorgeB]

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.