The system is x86_64 and I'm using brtfs.  So that clears that up:

findmnt --notruncate /

TARGET SOURCE       FSTYPE OPTIONS
/      /dev/nvme0n1p10[/root00]
                    btrfs rw,relatime,seclabel,ssd,space_cache,subvolid=276,subvol=/root00

findmnt --notruncate /home

TARGET SOURCE       FSTYPE OPTIONS
/home  /dev/nvme0n1p10[/home]
                    btrfs rw,relatime,seclabel,ssd,space_cache,subvolid=257,subvol=/home

However, it's still confusing to me having df show that both /home and / are filled up when du -s shows that /home is only using 96G.  I found the problem by doing du -s /usr/* and saw that /usr/local was consuming a lot of space.

du -s /home
96971060    /home

du -s /
5436965761    /

Paolo

On 2/6/22 08:49, francis.montag...@inria.fr wrote:
Hi.

On Sun, 06 Feb 2022 11:42:22 -0500 "Garry T. Williams" wrote:

You probably have / and /home on subvolumes of a btrfs file system.
+1

The clearer way to see that is probably to use:

   findmnt --notruncate /
   findmnt --notruncate /home

Example: see the subvol= option:

findmnt --notruncate /
TARGET SOURCE                                            FSTYPE OPTIONS
/      /dev/mapper/luks-c92191d5-7811-49f9-867c-1e300d1e9410[/root]
                                                          btrfs  
rw,relatime,compress=lzo,ssd,space_cache,subvolid=258,subvol=/root

findmnt --notruncate /home
TARGET SOURCE                                            FSTYPE OPTIONS
/home  /dev/mapper/luks-c92191d5-7811-49f9-867c-1e300d1e9410[/home]
                                                          btrfs  
rw,relatime,compress=lzo,ssd,space_cache,subvolid=257,subvol=/home

That is the current default configuration now.
But it was not in F31 ...

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