At Sat, 10 Apr 2021 18:44:32 -0700, Brian Buhrow <buhrow%nfbcal.org@localhost> wrote: Subject: Re: I think I've found why Xen domUs can't mount some file-backed disk images! (vnd(4) hides labels!) > > hello. This must be some kind of regression that's ben around a > while. I'm runing a xen dom0 with NetBSD-5.2 and xen-3.3.2, very old, > but vnd(4) does expose the entire file to the domu's including FreeBSD > 11 and 12 without any corruption or booting issues. Do you know when > this trouble began? I don't know -- I think I've only ever successfully used ISO files, and I think I gave up on some IMG file(s) previously (possibly not just from FreeBSD) without trying to understand why they didn't work. Have you tried specifically with a recent FreeBSD mini-memstick.img file? I'm thinking (esp. given what I see from "od -c < /dev/rvnd0d") that what's wrong is the vnd(4) driver is (also?) imposing some mis-interpreted idea about the number of cylinders and heads or something like that, especially given that "fdisk vnd0" is so totally confused about what's in there. There's a definite pattern of corruption anyway -- I just can't explain it well enough yet. -- Greg A. Woods <gwoods%acm.org@localhost> Kelowna, BC +1 250 762-7675 RoboHack <woods%robohack.ca@localhost> Planix, Inc. <woods%planix.com@localhost> Avoncote Farms <woods%avoncote.ca@localhost>
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