It would be nice for unraid to be able to sustain a 1 gigabit file transferr across drives instead of dipping to 30MB then to 1MB and staying there for the rest of the transfer. I have read almost every where about this issue. I have 6 servers with only one with unraid and would like to buy a few more licenses to put uraid on those, but the file transfer in unraid is abisymal.  Transfering from windows explorer to safari to krasder to just about anytthing else involving the unraid server grinds to a haul. Synology to windows, windows to synology to linux to windows server to truenas to ovm all get almost 10gbit. Unraid is only capabile of usb 2.0 speeds at best.  Sorry for the rant. but if they fixed this, they would be a force to be reckoned with in the server community. Yes I know unraid only uses one drive in the array to transfer, but hdd tech has gone way past 1 gigabit a sec. Cone on guys. 

Works just fine here and for many others with the right config, 200MB/s with no problem.

Detail your setup, sounds like you might have SMR drives.

Hi, thank you for your reply. I have tested this setup with external usb 3 drives connected to differnet hardware. I have also transferred from a synology nas from a windows 10 workstation with refs arrays and get 600 to 700MB per sec. Using the unraid ssd cache to transfer to and from with the odd array transfers on a dell 720 server with 128 gigs of ram with dell certified hdds running unraid.

 Mind you I am using a flashed h710 mini as the controler that lets the drives be controled by unraid.

 I have found unraid to be the problem. When I have promox on this server it flys, and with server 2016 it flies. Unraid starts off at 500MBs a sec and after 10 to 30 secs later it drops to 30MBs a sec. Sometimes it stays there but it often goes down to 1 to 5 MBS a sec a minute later.  With sometimes of TBs to tranfer this is unacceptable as I love and prefer unraid to anythings else, but performance must be sorted out before I expand unraid on my network. 

 If you have magic settings on your setup I would love to cash in on your knowledge if possible. 

First thing is to make sure reconstruct writes are enabled for the array. 30MB/s writes to array are about right if it's disabled, and it is by default since that allows drives to spin down for power savings.

Yes I have that enabled, but the problem that I have read is that unraid uses fuse when going through /mnt/user pathways. I was told to never go through that pathway.  How do you config your shares and disks? .

To got best performance on array writing, pls use disk share instead user share if possible, and always ensure only one read/write session in array. Pls also ensure no any abnormal / slow disk in array too.

6 hours ago, Ganadann said:

I was told to never go through that pathway. 

That makes no sense since it's the whole point of unraid.

There is a slight performance hit but it's about number of files accessed, not transfer speed on one file. So unless you're transferring a folder with tens of thousands of small files that won't be the reason.

On 6/24/2023 at 1:12 AM, Ganadann said:

It would be nice for unraid to be able to sustain a 1 gigabit file transferr across drives instead of dipping to 30MB then to 1MB and staying there for the rest of the transfer. I have read almost every where about this issue. I have 6 servers with only one with unraid and would like to buy a few more licenses to put uraid on those, but the file transfer in unraid is abisymal.  Transfering from windows explorer to safari to krasder to just about anytthing else involving the unraid server grinds to a haul. Synology to windows, windows to synology to linux to windows server to truenas to ovm all get almost 10gbit. Unraid is only capabile of usb 2.0 speeds at best.  Sorry for the rant. but if they fixed this, they would be a force to be reckoned with in the server community. Yes I know unraid only uses one drive in the array to transfer, but hdd tech has gone way past 1 gigabit a sec. Cone on guys. 

this is hard to diagnose without a diag file to take a look....

from drive cache speed such as HDD with smr limitations, to array/fuse limitation to windows /protcal that your calling the transfer.

I use ssh and filezilla with sftp and can saturate a download link. more info is needed here.