Slow disk to disk writes, no parity drive enabled

[marcusone1]

I am setting up a new system and moving drives, so thought it a great time to convert from reiserfs to XFS.

 

The issue:

I have a new unraid 6.7.2 running and working fine. with some new Red Pro drives 6TB, and 4TB to convert some 4-9year old 2TB Greens/Reds.

I start the array WITHOUT a parity drive (as I don't want to wait for the new 6TB to do parity until after I convert my drives).

 

when i do the rsync command like

`rsync -avPX /mnt/disk1/ /mnt/disk2/`

 

transfer speeds on large files drop to as low as 1MB/s (yes, 1 or sometime 800KB/s)... happens with even just one rsync going.

 

If i stop the array, remove all the drives from assigned drives, manually mount the drives, i get the expected 80-120MB/s of the old drive read speed.

I can even do two 2TB old  5400rpm drives to a new 7200rpm drive and each one gets about 80-100MB/s (as the new drive caps out at 240MB/s).

when manually mounted!

 

Why the slow transfer when the drives are in the array (WITHOUT a Parity drive).  I tried the md_write_method to reconstruct write, but that didn't do anything

 

Thanks!

[JorgeB]

Upgrade to v6.8, there are known performance issues with v6.7.x