[Nix-dev] LVM troubles

[Lluís Batlle i Rossell]

On Sun, Apr 21, 2013 at 07:29:22PM +0200, Rickard Nilsson wrote:
> Hi,
> 
> I noticed today that my NixOS system that uses LVM on top of mdadm RAID  
> doesn't boot. It seems the LVM volumes are not activated. The NixOS init  
> says something about "starting LVM" and then it immediately starts looking  
> for the root device, which fails. If I try booting an older generation  
> (nixos-0.2pre-d99fce2-930e4d5), it prints that it found a number of lvm  
> volumes before starting to scan for the root device.
> 
> Has something changed regarding LVM in NixOS lately (the last two months  
> or so) which might cause this behavior? Do I need to add any extra kernel  
> module include something LVM-related in the initrd?

I built my nixos yesterday, and all worked fine. I didn't notice any change.
Here I use root+nix over luks over lvm.

> I realise now, that just doing "nixos-rebuild switch", and not rebooting  
> the system every once in a while, can be risky...

Well, old generations did work, didn't they?