Slow Robocopy to unraid server

[DatBoiC]

I am having trouble copying 12tb of data to a new unraid build.  I built my array with no parity drive or cache so data could be written straight to the array and add parity when completed with the data transfer.  I usually use robocopy to move my data so I can do multithread and move it alot faster.  But every time I use robocopy with any switches my speed drops to 20mb a second.  But if I use traditional windows copy paste or robocopy with no switches(Moving files one at a time) I get the full speed of 110mbs a second.  I am new to Unraid and wondering if this normal or did I mess up configuration somewhere.  Any help would be greatly appreciated.

[JorgeB]

I've used robocopy before with no issues, what is the command line you're using?

[DatBoiC]

I am using this command below

 

robocopy "E:\" "\\nas\Media\" /E /Z /R:5 /W:5 /TBD /NP /V /MT:16

 

my E drive is a easystore drive

Edited December 23, 2020 by DatBoiC

[JorgeB]

Try without /z

[DatBoiC]

Tried that tried all combinations even just /mt:4 the only one that gives me 100mb+ is robocopy "E:\" "\\nas\Media\" with no switches.

[JorgeB]

14 minutes ago, DatBoiC said:

the only one that gives me 100mb+ is robocopy "E:\" "\\nas\Media\" with no switches.

Then use that, with /e so it copies the subdirectories, you don't really need the other options.

[DatBoiC]

Thats what I'm doing right now but it makes the copy triple the length of time than running multithread where it copies multiple files at one time rather that 1 file at a time.  Then I have another 12tb drive I have to move over after I finish this one.  Is Unraid just not robocopy friendly.

[JorgeB]

32 minutes ago, DatBoiC said:

that gives me 100mb+

It can't go faster than this, unless you have 10GbE.

[DatBoiC]

with multi thread it will still give you the 100mb going from two regular servers while writing multiple files at the same time.  Multi thread or any switches bring my speed down to 20 to 30mb not using the full bandwidth of the link the 100mb's.

[JorgeB]

Multi thread will not always be faster, in fact it's likely going to be slower with large files, it can be faster with very small files.