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From: Martin Steigerwald <martin@lichtvoll.de>
To: Linux BTRFS mailing list <linux-btrfs@vger.kernel.org>,
 Ulli Horlacher <framstag@rus.uni-stuttgart.de>
Subject: Re: 2 PB filesystem ok?
Date: Wed, 01 May 2024 21:47:45 +0200
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Ulli Horlacher - 01.05.24, 20:19:03 CEST:
> On Wed 2024-05-01 (16:16), Tomas Volf wrote:
> > On 2024-05-01 10:50:12 +0200, Ulli Horlacher wrote:
> > > On Mon 2024-04-29 (12:34), Johannes Thumshirn wrote:
> > > > I have used 2PB filesystems in my RAID Stripe Tree test
> > > > environment, but for practical uses, I suggest you to enable the
> > > > block-group tree feature during mkfs time.
> > >=20
> > > I cannot find such an option in man-page for mkfs.btrfs
> > >=20
> >     $ mkfs.btrfs  -O list-all
[=E2=80=A6]
> > So I believe it would be `mkfs.btrfs -O block-group-tree ...'.
>=20
> root@fex:~# mkfs.btrfs  -O list-all
[=E2=80=A6]
> root@fex:~# btrfs --version
> btrfs-progs v5.16.2
>=20
>=20
> This is Ubuntu 22.04

Too old.

See here for minimum requirements:

https://btrfs.readthedocs.io/en/latest/Feature-by-version.html

Kernel (and I bet) btrfs progs 6.1.

I bet there is a PPA for newer kernels for Ubuntu. Whether there is a PPA=20
for never btrfs progs, I don't know.

Best,
=2D-=20
Martin