With dockers and VMs currently disabled while I do some setup, copying files from one disk to another via rsync is showing speeds ranging from 120MBps to as low as 4.5MBps with an average of around 50MBps.   Copying files to server via SMB fares a bit better but still under about 60MBps.   Turning "turbo" on/off doesn't make much of a difference.

 

What are typical R/W speeds?  Drives individually did about 150MBps to 185MBps during preclear.

Hi -

 

What you're experiencing is about normal.  Over SMB I typically get 45-65 MB/s writing directly to the parity protected array.  Don't forget that a write to the array requires 4 i/o operations, not one.  I get a nice boost from turbo write, 85-110 MB/s.  If I write a lot of small files rather than large ones, though, the file system overhead impacts performance (just as it does with most OS/file system).  If you tend to sit around watching writes to your server then it can be worth implementing write-caching to a fast HD or SSD cache drive.  Personally I don't bother.