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Help with Transfer speeds since update to 6.5.0

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Hi, I noticed since I updated to 6.5.0 that my transfer speeds for large files while rock solid and consistent have dropped from 90MB/s average both ways to not only 54MB/s write and 31MB/s read. Its very frustrating. I thought it was a windows 10 update at first and tried on doing transfers with my same PC but running windows 7 with the same result.

 

My network is all Cat 6 solid copper. All points in the network are rated for Gigabit speeds and nothing about my network has changed before and after the slowdown. I can transfer at 90-100MB/s between my workstation machines over my network but not to my UNRAID server.

 

UNRAID Pro is running on an IBM x3650 m3 with a SAS controller to 4 SAS 10kRPM pooled cache drives on board. With a second SAS controller to a Dell Powervault MD1000 with 14 SAS enterprise grade drives. Everything has worked flawlessly together for 3 years. All drives in the array have been tested before and since the slow down the indevidual drives all test with flying colors  individually on read/wright speeds. The array is 98% of the time in a standby mode with all disks spun down to increase the life of the drives and only accessed when I want to store data I want to protect.

This set up since I built it has always saturated gigabit speeds at 90-100MB/s on my network but now something is off and I cant figure it out.

 

I attached the diagnostics file, if anyone sees something glaringly obvious that I'm missing please point it out. I've done IT for 10 years but even I miss things. 

x3650-diagnostics-20180419-0156.zip

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per the suggestion I downgraded to my back up of 6.4 and the issue was gone, upgraded and the issue came back, but I don't notice anything else changing.

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Likely some driver or kernel change causing the issue with your hardware, with some luck it will return to normal on next update, you might also try latest rc.

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yea, that's the only think i can think of, not a critical issue or anything. I also know I'm not a typical hardware config so I have low expectations for optimization or compatibility. I'm just happy my data is safe and accessible. Could be worse right.

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change MTU on your windows network card to 4K and test again. this happen to me and that was my fix. I left my UNRIAD network MTU at 9K

 

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7 minutes ago, Spazhead said:

change MTU on your windows network card to 4K and test again. this happen to me and that was my fix. I left my UNRIAD network MTU at 9K

 

How will that help? The MTUs of everything on a given Ethernet segment need to be identical. Set everything to 1500 for gigabit Ethernet and save 9000 for 10G Ethernet and don't use any other values anywhere.

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22 minutes ago, John_M said:

 

How will that help? The MTUs of everything on a given Ethernet segment need to be identical. Set everything to 1500 for gigabit Ethernet and save 9000 for 10G Ethernet and don't use any other values anywhere.

 

don't know, but I had the same problem after upgrading to 6.5, and by chance I change the MTU on windows side to 4k and my transfer speeds were back up to 109read and 109 write.  I'm no expert, but did this for all 4 PC in my house with the same results.

 

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