Thanks, Alex, for your reply. It seems that the safest path is to go
for a fresh install of Fedora.

Paul

On Tue, May 2, 2023 at 11:07 AM Alex Gurenko via users
<users@lists.fedoraproject.org> wrote:
>
> I've forgot to add, that for compression, this, again, works only for newly 
> created/accesses files only, so after adding compression to fstab (and 
> reboot), you might want to run a defragmentation `sudo btrfs filesystem 
> defragment -r <mount point>`.
>
> There was a recent article about that too: 
> https://fedoramagazine.org/working-with-btrfs-compression/
>
> ---
> Best regards, Alex
>
>
> ------- Original Message -------
> On Tuesday, May 2nd, 2023 at 12:04, Alex Gurenko <agure...@protonmail.com> 
> wrote:
>
>
> > There was an article back in the days of btrfs introduction that described 
> > the process: https://fedoramagazine.org/convert-your-filesystem-to-btrfs/
> >
> > I've used it myself without any issues back then, I would assume it's still 
> > safe to do so now.
> >
> > I ran it like this for a few more releases without issues, until I decided 
> > to re-install fresh.
> >
> > The only downside would probably be (please keep me honest here), the 
> > defaults might not apply.
> >
> > There are few things that are done on a fresh install, which will probably 
> > won't apply on a converted system:
> >
> > - COW (copy-on-write) disabled for /var/lib/libvirt/images
> > - probably on other directories?
> > - can be done manually with `chattr -R +C <path>` but it only works for new 
> > files in said path, so you might need to move things out and back in
> >
> > - enable compression by making sure fstab includes `,compress=zstd:1`
> > - based on your position on async discard [0], you might want to add 
> > `nodiscard` to fstab as well, but it seems to be okay with latest fixes 
> > kernels 6.2.13+ or 6.3.0, at least on a desktop
> >
> > [0] 
> > https://discussion.fedoraproject.org/t/btrfs-discard-storm-on-fedora/79997/28
> >
> > ---
> > Best regards, Alex
> >
> >
> >
> >
> > ------- Original Message -------
> > On Tuesday, May 2nd, 2023 at 11:29, Paul Smith phh...@gmail.com wrote:
> >
> >
> >
> > > Dear All,
> > >
> > > I have always upgraded Fedora from the previously installed version.
> > > Consequently, I still have ext4. To have btrfs, is it needed to do a
> > > Fedora clean install?
> > >
> > > Thanks in advance,
> > >
> > > Paul
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