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Re: btrfs compression by default



On Tue, Feb 9, 2021 at 11:40 AM Martin Kolman <mkolman redhat com> wrote:
>
> On Tue, 2021-02-09 at 09:50 -0700, Chris Murphy wrote:
> > On Tue, Feb 9, 2021 at 9:15 AM Michel Alexandre Salim
> > <michel michel-slm name> wrote:
> > > There's a further complication: Chris just informed me that on BIOS
> > > systems, space is more of a constraint so the zstd module is not part
> > > of GRUB ... meaning we have to handle these two scenarios:
> >
> > It's available, but it's the 2nd largest GRUB module at ~100KiB. And
> > on BIOS we're space limit right now to 1 MiB MBR gap or BIOS Boot
> > partition.
> >
> > GRUB works fine with a zstd compressed /boot/ but obviously there's
> > next to no benefit compared to the added complexity since the kernel
> > and initramfs are already compressed.
> >
> > So if it's not difficult to exclude compression on /boot/ that's
> > probably preferred?

> Are we talking about custom partitioning layouts ?

For Fedora 34, yes. There's an idea/pre-plan for Fedora 35/36 to put
/boot/ on Btrfs by default; but it's contingent on GRUB changes needed
upstream to better support grubenv by putting it on a dedicated
partition. [1]

> Because I've just booted a current Rawhide installer and it creates /boot on a separate standard partition
> formatted with EXT4 by default, with / and /home on BTRFS.

Yes.

-- 
Chris Murphy


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