I have a gigabit LAN in my home office, storing a large amount of data with triple redundancy.I have been experimenting with Jumbo frames, with disappointing results.The setup:Vodafone high-speed cable with Cisco modemAsus RT-N66U routerD-Link DGS-1008D 8-port switchSynology DiskStation DS1813 - 8-bay with 32 TB RAID array (Synology Hybrid RAID)Windows Server 2008 data server with a 24 TB RAID 5 arrayLian Li EX503 with a 24 TB RAID 5 array - connected by USB3 to the Windows data serverOther PCs running Win7 x64All patch cables are new Cat 6The whole system is ethernet - no WiFi involved.I use ViceVersa Pro software to synchronize back-ups.All of these devices are less than 2 years old, all except the USB3 device support Gigabit ethernet and Jumbo frame, and all firmware is up-to-date.I tried setting all devices to an MTU of 9000 - but the RT-N66U router only has an "Enable Jumbo Frames" option (MTU not specified)Results with Jumbo frame are worse than without it - typical ethernet speeds are 30 MBytes/sec (with Jumbo) vs. 40 MBytes/sec (without Jumbo). I get 180 MBytes/sec via USB3.Is the problem the RT-N66U router? - I can't find out what jumbo frame sizes it supports.
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