[systemd-devel] Antw: Re: Antw: [EXT] Re: the need for a discoverable sub-volumes specification

[Ulrich Windl]

>>> Chris Murphy <lists at colorremedies.com> schrieb am 28.12.2021 um 20:02 in
Nachricht
<CAJCQCtTfUWVP0NMGtTb7CM3bY6UCGnmNr+r0_L=Z9tW5Er-Gjg at mail.gmail.com>:
> On Mon, Dec 27, 2021 at 3:40 AM Ulrich Windl
> <Ulrich.Windl at rz.uni-regensburg.de> wrote:
>>
>> >>> Ludwig Nussel <ludwig.nussel at suse.de> schrieb am 21.12.2021 um 14:57 in
>> Nachricht <662e1a92-beb4-e1f1-05c9-e0b38e40eb1e at suse.de>:
>>
>> ...
>> > The way btrfs is used in openSUSE is based on systems from ten years
>> > ago. A lot has changed since then. Now with the idea to have /usr on a
>> > separate read-only subvolume the current model doesn't really work very
>> > well anymore IMO. So I think there's a window of opportunity to change
>> > the way openSUSE does things :-)
>>
>> Oh well, while you are doing so: Also improve support for a separate /boot
>> volume when snapshotting.
> 
> Yeah how to handle /boot gives me headaches. We have a kind of
> rollback, the possibility of choosing among kernels. But which kernels
> are bootable depends on the /usr its paired with. We need a mechanism
> to match /boot and /usr together, so that the user doesn't get stuck
> choosing a kernel version for which the modules don't exist in an
> older generation /usr. And then does this imply some additional
> functionality in the bootloader to achieve it, or should this
> information be fully encapsulated in Boot Loader Spec compliant
> snippets?

Well, it's a bit off-topic, but:
I had to use a separate /boot device due to the way my device is encrypted.
Everything had seemed to work fine until I tried to install the AMD graphics driver
that resulted in a failed boot (I can't remember the exact details).
Unfortunately AFTER that I found out that there were no snapshots of /boot created (only of the root filesystem).
(So recovery was a bit messy)
Meanwhile I had enabled /boot snapshots also, but still no boot snapshots are offered in the GRUB menu...

Basically that's what I had meant.

Regards,
Ulrich

> 
> 
> -- 
> Chris Murphy