why are / and /home the same filesystem?

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Folks,
  today I ran into a strange problem.  Both the root file system and the /home filesystem showed 100% usage:

df -l
Filesystem      1K-blocks      Used Available Use% Mounted on
devtmpfs             4096         0      4096   0% /dev
tmpfs            32793004         0  32793004   0% /dev/shm
tmpfs            13117204      2512  13114692   1% /run
/dev/nvme0n1p10 283625472 281920988    735540 100% /
tmpfs            32793008     11612  32781396   1% /tmp
/dev/nvme0n1p10 283625472 281920988    735540 100% /home
/dev/nvme0n1p8     463826    258874    176485  60% /boot
/dev/nvme0n1p7     487160     14280    472880   3% /boot/efi
tmpfs             6558600       196   6558404   1% /run/user/1000
tmpfs             6558600        88   6558512   1% /run/user/0

When I did a du -s of my home directory it showed only 96GB used.

sudo du -s /home/*

96910360    /home/pgaltieri

The problem turned out to be a large file in /usr/local.  When I removed this file both / and /home dropped in their usage:

Filesystem       1K-blocks       Used  Available Use% Mounted on
devtmpfs              4096          0       4096   0% /dev
tmpfs             32793004          0   32793004   0% /dev/shm
tmpfs             13117204       2616   13114588   1% /run
/dev/nvme0n1p10  283625472  187104116   95417980  67% /
tmpfs             32793008      11860   32781148   1% /tmp
/dev/nvme0n1p10  283625472  187104116   95417980  67% /home
/dev/nvme0n1p8      463826     258874     176485  60% /boot
/dev/nvme0n1p7      487160      14280     472880   3% /boot/efi
tmpfs              6558600        204    6558396   1% /run/user/1000

so why are / and /home the same device?  In the past / and /home where separate devices.  This is for F31

Filesystem               1K-blocks       Used Available Use% Mounted on
devtmpfs                   8121488          0   8121488   0% /dev
tmpfs                      8142632      97596   8045036   2% /dev/shm
tmpfs                      8142632       2000   8140632   1% /run
/dev/mapper/fedora-root   51475068   36099716  12737528  74% /
tmpfs                      8142632     171148   7971484   3% /tmp
/dev/mapper/fedora-home  645292064  391044160 221445908  64% /home
/dev/sda8                   487652     203435    254521  45% /boot
/dev/sda1                   507904      61176    446728  13% /boot/efi

Paolo

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