Hey everyone totally new to server/NAS and still on trail with unRAID, and I just finished my setup yesterday:

It's a core i3, 8G ram with 4 3tb WD red. I have one parity and it finished syncing last night. 

And today I started to copy some of my data to the array (large movies), and I can only get around 50 mb/s write speed. I know it's not network or hardware bottleneck because when I copy the same file out to windows, I get 112mb/s, the full gigabit ethernet speed.

I'm confused, is that due to the parity? because the disk activity when I write is interesting: disk 1 write 50mb/s, AND parity write 50mb/s. 

Is this normal? Isn't half of the speed get wasted? It's not that big of a problem for what I used this for, but still feels off tho.

Thanks!!!

 

EDIT: Also even if the data is write to two disk, shouldn't I have the full speed on the sending end? And if the parity works like a RAID 1, which it doesn't, how a single 3TB drive can protect a 9TB array? Little bit confused 

Edited March 9, 20179 yr by georgeq

Normal speed for default writing mode, see here for an explanation how it works and the alternative reconstruct write, aka turbo write:

 

 

Got it Thanks!!