>Do any of you know what a RAID-50 array is?
Yes. One of those arcane hybrids RAIDS I would never ever touch though.

>Returning to the current Epyc build, I decided after getting non-GPU passthrough to work, and wishing I could have more than one virtual machine running across my thirty-two vCPUs,
A understandable wish. I mean, if I can have two VMs running at once, albeit tiny ones, on a core duo laptop from 2008, at that point one ought to put those cores to use!

>
Much difficulties getting the 300w to be not only available but believably (by the card) available (I'm using a single sata-power line for the 150w plug. It's "officially" rated for 54w but is pretty stout, can probably pass more. But still...) and then other troubles, such as getting keyboard/mouse to pass over to the matching video output.
And this is where I start to wince in pain. Though I can't say I have ever put together a system of that complexity, from putting together strange and janky set ups from scrap computers I can certainly relate to the efforts of tinkering a system...

>Oh, the windows were still there, but the window manager had become completely unresponsive,
..and when one crashes and burns.

>Hard powerdown, and after some time for it to cool, I booted a recsucesystem to examine my Linux half. And it was a mess. Thousands of inodes, links, with every error I've ever encountered, and after that, hundreds (maybe thousands, I gave up after a while) of files with inodes that, according to fsck, were being argued over by sometime half a dozen other files in far-reaching sections of the filesystem.
>and the xterm window insisted /bin/ls was not actually a file, but only a figment of my fevered typing.
Have been in this seat before. Plenty of times.