Re: uvnfp2 / biowait

["T K Spindler (moof)" <dogcow%babymeat.com@localhost>]

On Mon, Dec 23, 2024 at 10:03:46AM +0000, Patrick Welche wrote:
> Slightly more clue: umass0/msdos was an SD card in a USB SD card
> reader.  The SD card sd0 kept going offline and returning which
> presumably resulted in the above.  dd'ing its constents locally
> and using the file as a vnd worked.
> 
> A working 10T real drive when plugged into a USB external enclosure
> also keeps going on and offline. Works fine when connected directly
> via SATA.

Both of these jibe with my experience, unfortunately; the msdos fs
code is kinda janky and unreliable at best, and umass and the rest
of the USB subsystem (in particular: ehci) is not much better. It's
been that way for decades.