Hello, Alan. On Wed, Jan 11, 2023 at 20:16:07 +0000, Alan J. Wylie wrote: > Alan Mackenzie <a...@muc.de> writes:
> > My system isn't booting. In particular, most of the SSD partitions > > won't mount, because they are not under /dev any more. The root > > partition, /dev/md125 mounts, but that is all. > > These partitions are lvm partitions under RAID-1 (software RAID). They > > simply fail to appear in /dev/mapper on boot up. > > I've managed to bring my system up using a Rescue-DVD followed by > > chroot. This shows that the partions on the SSD are basically > > undamaged. > > I strongly suspect that my emerge update from last night is to blame. > It was. > Been there, done that myself. > Mount your filesystems from the rescue boot and chroot into them. > Re-emerge lvm2 with the "lvm" flag enabled. Many thanks, indeed! That was the cause of my problem, and re-emerging lvm2 with that USE flag set solved it completely. > See > https://www.gentoo.org/support/news-items/2022-11-19-lvm2-default-USE-flags.html Yes. There was even a news item about it back in November. I've read it again, and it seems too vague to me. For example, it says: >>> If you use LVM2 for any partitions, or if you use tools like >>> 'lvchange', you should enable USE=lvm. , without saying in detail anywhere what it means to "use" LVM2. I wasn't aware of "using" LVM2 when I read that news item, so I just carried on, blithely unaware of the coming catastrophe. ;-) Still, it's OK, now. > Some of these commands (or similar) in the rescue boot might be helpful: > mkdir -p /mnt/{usr,var,home,work,boot,dev,sys,proc} > mount /dev/mapper/vg0-root /mnt > mount /dev/mapper/vg0-usr /mnt/usr > mount /dev/mapper/vg0-var /mnt/var > mount /dev/mapper/vg1-home /mnt/home > mount /dev/mapper/vg1-work /mnt/work > mount /dev/sda1 /mnt/boot > mount -o bind /dev /mnt/dev > mount -o bind /dev/pts /mnt/dev/pts > mount -o bind /dev/shm /mnt/dev/shm > mount -o bind /sys /mnt/sys > mount -o bind /proc /mnt/proc > PATH=/bin:/sbin:/usr/bin:/usr/sbin \ > SHELL=/bin/bash \ > chroot /mnt Thanks for that, too. I actually created a small script with commands like these when I was installing Gentoo ~5 years ago, and I adapted that, saving the heavy labour of working out again that the flag in mount that I need is -o bind. :-) > -- > Alan J. Wylie > https://www.wylie.me.uk/ > Dance like no-one's watching. / Encrypt like everyone is. > Security is inversely proportional to convenience -- Alan Mackenzie (Nuremberg, Germany).
