Hello, I am getting slow transfer speeds from ssd to ssd on my unraid server(both housed in the same server physically) I get speeds up to 400MB/s then it quickly drops to around 20-30MB/s for a ~20GB file. I have tried to run the fstrim and balance commands in the unraid console and the fstrim will not work it gives an error(see attached snip). The unraid gui/dockers are also freezing and acting sluggish during the transfer of files to the cache until its completed or stopped manually.

 

Unraid is running on a Dell R720xd chassis with the ssds located at the back of the server in the 2.5 slots. I am using the dell 710p mini monolithic card flashed to IT mode. The ssds I am using are 2x 512gb Samsung 850 Pro drives to test with, one is cache other is a UA drive.

 

I read that hbas sometimes will not allow the trim commands to go through to the drives, is that the case here or is there something else I am missing? If anything else is needed to help diagnose my issues please let me know.

 

Edited August 2, 20196 yr by Audz

H710p won't support trim.

it might have filled the internal cache size limit of the ssd, ,it then slows down and writes it to the flash storage itself, same goes for reading, tech deals showed off this in a nvme comparison video recently @ about the 17min mark