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-------- Original message --------

From: Russell Coker <russell@coker.com.au>

Date: 30/11/20 3:46 pm (GMT+10:00)

To: luv-main@luv.asn.au, Andrew Greig <pushin.linux@gmail.com>

Subject: Re: Upgrading Ubuntu with a RAID drive

On Sunday, 29 November 2020 9:45:11 AM AEDT Jason White via luv-main wrote:
> On 11/28/20 5:33 PM, Andrew Greig via luv-main wrote:
> > I have a Ubuntu 18.04.5 LTS distro with a RAID 1 pair under btrfs.And
> > now I am considering upgrading to another LTS release.
> >
> > Will the commands relating to the RAID survive the upgrade, will the
> > script work from Ed survive the upgrade?
>
> I would expect the RAID configuration to continue to work following the
> upgrade. I'm obviously not familiar with the contents of the scripts, so
> I can't be sure, except to say that the Linux command line interface and
> directory hierarchy tend to remain fairly stable across distribution
> releases. If you have a good backup of everything, you can always
> downgrade if there are problems, or resolve them after the upgrade if
> they aren't too severe.

Yes, I've upgraded Debian BTRFS systems since 2012 without any problems and as
Ubuntu is based on Debian it should work the same way.

BTRFS supports the subvol= mount option, so you can mount a subvol as root.
You can make a read-write snapshot of root, upgrade the regular root, and then
boot from the subvol if something goes really wrong with the upgrade. Also
you can use systemd-nspawn to run a chroot environment if you need to use old
versions of apps. I have old distributions running with systemd-nspawn and
ssh to them to run older apps.

--
My Main Blog http://etbe.coker.com.au/
My Documents Blog http://doc.coker.com.au/

Thanks Russell,

I will keep this info handy, I appreciate it.

Andrew