February 3, 20188 yr As I was looking for the best way to use an external USB DAC with a Windows 10 VM I have found that plugging it in directly to the motherboard instead of through the USB hub on the case. Using the case USB hub was producing periodic clicking sounds and plugging it directly in the motherboard worked just fine. About 5 minutes into my last configuration intervention using the Libvirt Hotplug USB plugin I was enjoying some music when it suddenly stopped, screen froze (GPU passthrough) and sound started coming out of the frozen-picture monitor instead of the USB DAC. After the current video that was playing ended, the screen stopped being frozen and continued working as expected. Using a separate machine I've opened the webGui where I found out all visual preferences (theme, logo, etc) were reset to their default settings with the Docker and VMs buttons missing. Most of the pages were stuck in my favourite never ending loading loop, but the VMs page loaded fine when accessed manually. First thing that became apparent was the following PHP warning: Warning: parse_ini_file(/boot/config/domain.cfg): failed to open stream: No such file or directory in /usr/local/emhttp/plugins/dynamix.vm.manager/classes/libvirt_helpers.php on line 459 Popping into unRAID via SSH indeed revealed that the /boot folder is empty. Dmesg confirmed there's an issue: [849527.308266] blk_partition_remap: fail for partition 1 [849527.308267] FAT-fs (sda1): Directory bread(block 29595) failed Lsusb only showed the 4 USB hubs on the case: # lsusb Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub To summarise, there was a keyboard and a mouse connected to that Windows VM which was working stable under high load for the past few months. After adding another mouse and the USB DAC it continued working fine for about 15 minutes. Figuring out I might achieve better results connecting directly to the motherboard instead of going through the case hub, I detached both devices via the Libvirt Hotplug USB plugin and attached them back into the VM via dedicated USB 3 ports on the back of the motherboard. It is somehow strange that the case hubs are present to the system and everything else went missing, including the Corsair power supply that is connected via USB directly to a USB header on the motherboard, similarly to how the case hubs are connected. Update: It is not possible to stop the array safely in this situation. The update.htm page doesn't respond to the POST requests that the Main page generates. helion-diagnostics-20180203-1904.zip Edited February 3, 20188 yr by realies
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