April 19, 20188 yr 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
April 19, 20188 yr Community Expert Are you sure it's related to v6.5, i.e., did you downgrade to a previous release to confirm?
April 21, 20188 yr Author 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.
April 21, 20188 yr Community Expert 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.
April 21, 20188 yr Author 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.
April 22, 20188 yr 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
April 22, 20188 yr 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.
April 22, 20188 yr 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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