Ubuntu 25.10 btrfs

#apt install btrfs-compsize
compsize /storage

root@server5:~# compsize /storage
Processed 2372982 files, 3851354 regular extents (4229108 refs), 356322 inline.
Type       Perc     Disk Usage   Uncompressed Referenced
TOTAL       99%      8.0T         8.1T         9.6T
none       100%      8.0T         8.0T         9.6T
zlib        34%       13G          37G          40G
prealloc   100%      138M         138M         334M

root@server5:~# compsize -x /
Processed 93920 files, 70781 regular extents (71235 refs), 35789 inline.
Type       Perc     Disk Usage   Uncompressed Referenced
TOTAL      100%      4.4G         4.4G         4.3G
none       100%      4.4G         4.4G         4.3G
prealloc   100%       25M          25M          22M

# apt install -y jdupes
jdupes --one-file-system --dedupe --recurse --size /storage/
jdupes --one-file-system --dedupe --recurse --size /

...

  [SRC] /etc/apt/sources.list.d/ubuntu.sources.curtin.orig
  ====> /usr/share/doc/apt/examples/ubuntu.sources

  [SRC] /etc/apt/preferences.d.save/ubuntu-pro-esm-infra
  ====> /etc/apt/preferences.d/ubuntu-pro-esm-infra

  [SRC] /etc/apt/preferences.d.save/ubuntu-pro-esm-apps
  ====> /etc/apt/preferences.d/ubuntu-pro-esm-apps

  [SRC] /etc/apt/apt.conf.d/50unattended-upgrades
  ====> /usr/share/unattended-upgrades/50unattended-upgrades
  ====> /var/lib/ucf/cache/:etc:apt:apt.conf.d:50unattended-upgrades

  [SRC] /etc/apt/apt.conf.d/20auto-upgrades
  ====> /usr/share/unattended-upgrades/20auto-upgrades
  ====> /var/lib/ucf/cache/:etc:apt:apt.conf.d:20auto-upgrades

Deduplication done (5015 files processed)

btrfs filesystem du --summarize --human-readable  /storage/

root@server5:~# btrfs filesystem du --summarize --human-readable  /storage/
     Total   Exclusive  Set shared  Filename
   9.64TiB     6.69TiB     1.41TiB  /storage/

root@server5:~# df -h /storage
Filesystem      Size  Used Avail Use% Mounted on
/dev/nvme0n1p1   15T  8.2T  6.5T  56% /storage

root@server5:~# btrfs filesystem df /storage
Data, RAID0: total=9.22TiB, used=8.09TiB
System, RAID1: total=8.00MiB, used=560.00KiB
Metadata, RAID1: total=13.00GiB, used=10.93GiB
GlobalReserve, single: total=512.00MiB, used=0.00B

root@server5:~# btrfs filesystem df /
Data, single: total=6.01GiB, used=4.42GiB
System, DUP: total=8.00MiB, used=16.00KiB
Metadata, DUP: total=1.00GiB, used=102.88MiB
GlobalReserve, single: total=13.89MiB, used=0.00B