12 minutes ago, jvdivx said:

I have found a workaround while I find the definitive solution.

Using the CA Users Scripts, I have scheduled a task to copy for 15 minutes and stop, and launch it again after 5 minutes. So I always get the top transfer

I will adjust it if I see that I can extend the times more

It better then nothing.

 

I google some thing about SMR, but I don't know Unraid implement or not. Just that also make me think does your friend connect SMR disk to AHCI and got different result. Btw below are good article.

 

https://zonedstorage.io/introduction/smr/#smr-implementations

 

Drive Managed allows plug-and-play deployment without modifying host software. It accommodates both sequential and random writing, but can result in highly unpredictable device performance.

 

https://zonedstorage.io/getting-started/smr-disk/

Edited September 1, 20196 yr by Benson

42 minutes ago, jvdivx said:

have found a workaround while I find the definitive solution.

Using the CA Users Scripts, I have scheduled a task to copy for 15 minutes and stop, and launch it again after 5 minutes. So I always get the top transfer

Consider a heat/cooling issue.  It has all the appearance of some component throttling back when it gets too hot...   (I did not take the time to go through this entire thread but I would be having a look at any SATA controllers.   I know that many of them tend to run hot under the best of conditions and you are are certaining pushing the edge of that envelope.  I would look at installing (temporarily) a fan to blow across any SATA controller heat sinks.) 

 

EDIT: if you have a SATA card without a heatsink on the controller chip that would be a red flag situation to me!

Edited September 1, 20196 yr by Frank1940

28 minutes ago, Frank1940 said:

Consider a heat/cooling issue.  It has all the appearance of some component throttling back when it gets too hot...   (I did not take the time to go through this entire thread but I would be having a look at any SATA controllers.   I know that many of them tend to run hot under the best of conditions and you are are certaining pushing the edge of that envelope.  I would look at installing (temporarily) a fan to blow across any SATA controller heat sinks.) 

 

EDIT: if you have a SATA card without a heatsink on the controller chip that would be a red flag situation to me!

Well it is very possible, I have temperature problems in summer with the server.

It is possible that the 5 minute stop. lower the temperature sufficiently and work properly again.

If it is that as soon as autumn / winter arrives. I will not need this workarround.

 

Thank you.

 

 

I have managed to lower the temperature of the controllers but I still have the same problem. Both the controller, as the SAS expander and the disks have an acceptable temperature after more than 6 hours of operation.

 

 

 

 

 

 

 

 

Edited September 5, 20196 yr by jvdivx