deoner
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deoner's post in Hard UI/SSH Freeze during high-speed downloads (i5-12400 / Realtek 2.5G / ZFS Mirror) - Worked for 20TB, now failing was marked as the answerFIXED
Status: Solved The Fix: Replaced a faulty Ethernet cable between the 16-port switch (where the server is connected) and the MikroTik router. The Discovery: The server was connected to a 16-port switch. Everything seemed fine, but I noticed the link between this switch and the main MikroTik router had dropped to 100Mbps and was likely producing massive CRC errors. Even though the server's local connection was Gigabit, the "bottlenecked" and faulty uplink to the router caused the system to choke.
Technical Summary for others: If your server freezes under load, check the entire chain of cables. A faulty uplink cable between switches can cause "Backpressure" and an "Interrupt Storm" on Core 0 of your Unraid server. The NIC driver struggles to handle the congestion and packet loss, leading to a complete UI lockup while the CPU is busy managing the network chaos.
Key Optimizations that stayed:
ipvlan instead of macvlan.
Realtek r8125 OOT Driver.
Direct Cache Paths (/mnt/cache/) to bypass FUSE.
CPU Pinning (keeping Cores 0 & 1 for the OS).