Low disk space warning when there is plenty of space - [SOLVED]

[techenthudiast]

Hi,

I have Linux Mint 21.2 since last week I started to receive warning about low disk space. However all partitions have plenty of space.
I do not know where to look. Please help. Here is print out of "inxi -Fxxxrz" minus repos

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System:
  Kernel: 5.15.0-97-generic x86_64 bits: 64 compiler: gcc v: 11.4.0
    Desktop: Cinnamon 5.8.4 tk: GTK 3.24.33 wm: muffin vt: 7 dm: LightDM 1.30.0
    Distro: Linux Mint 21.2 Victoria base: Ubuntu 22.04 jammy
Machine:
  Type: Laptop System: LENOVO product: 20QVCTO1WW v: ThinkPad X1 Extreme 2nd
    serial: <superuser required> Chassis: type: 10 serial: <superuser required>
  Mobo: LENOVO model: 20QVCTO1WW v: SDK0J40697 WIN
    serial: <superuser required> UEFI: LENOVO v: N2OET41W (1.28 )
    date: 11/25/2019
Battery:
  ID-1: BAT0 charge: 51.5 Wh (100.0%) condition: 51.5/80.4 Wh (64.1%)
    volts: 17.0 min: 15.4 model: Celxpert 5B10V98091 type: Li-poly
    serial: <filter> status: Full cycles: 386
  Device-1: hidpp_battery_0 model: Logitech Wireless Mouse MX Master 3
    serial: <filter> charge: 100% (should be ignored) rechargeable: yes
    status: Discharging
  Device-2: hidpp_battery_1 model: Logitech K350 serial: <filter>
    charge: 70% (should be ignored) rechargeable: yes status: Discharging
CPU:
  Info: 6-core model: Intel Core i7-9750H bits: 64 type: MT MCP smt: enabled
    arch: Coffee Lake rev: A cache: L1: 384 KiB L2: 1.5 MiB L3: 12 MiB
  Speed (MHz): avg: 1345 high: 3608 min/max: 800/4500 cores: 1: 3608
    2: 2330 3: 1000 4: 1000 5: 1000 6: 1000 7: 1000 8: 1000 9: 1000 10: 1000
    11: 1209 12: 1000 bogomips: 62399
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: Intel CoffeeLake-H GT2 [UHD Graphics 630] vendor: Lenovo
    driver: i915 v: kernel ports: active: none off: eDP-1 empty: none
    bus-ID: 00:02.0 chip-ID: 8086:3e9b class-ID: 0300
  Device-2: NVIDIA TU117M [GeForce GTX 1650 Mobile / Max-Q] vendor: Lenovo
    driver: nvidia v: 525.147.05 pcie: speed: 8 GT/s lanes: 16 ports:
    active: none off: DP-3,DP-4,DP-5 empty: DP-1,DP-2,HDMI-A-1
    bus-ID: 01:00.0 chip-ID: 10de:1f91 class-ID: 0300
  Device-3: IMC Networks Integrated Camera type: USB driver: uvcvideo
    bus-ID: 1-8:2 chip-ID: 13d3:56ba class-ID: 0e02 serial: <filter>
  Device-4: Logitech HD Webcam C910 type: USB
    driver: snd-usb-audio,uvcvideo bus-ID: 3-2.1.3:9 chip-ID: 046d:0821
    class-ID: 0e02 serial: <filter>
  Display: x11 server: X.Org v: 1.21.1.4 driver: X:
    loaded: modesetting,nvidia unloaded: fbdev,nouveau,vesa gpu: i915,nvidia
    display-ID: :0 screens: 1
  Screen-1: 0 s-res: 5760x3240 s-dpi: 96 s-size: 1524x857mm (60.0x33.7")
    s-diag: 1748mm (68.8")
  Monitor-1: DP-1-1.1 pos: primary,top-left res: 3840x2160 hz: 60 dpi: 61
    size: 1600x900mm (63.0x35.4") diag: 1836mm (72.3")
  Monitor-2: DP-1-1.2 pos: middle-r res: 1920x1080 hz: 60 dpi: 102
    size: 477x268mm (18.8x10.6") diag: 547mm (21.5")
  Monitor-3: DP-1-1.3 pos: primary,bottom-l res: 1920x1080 hz: 60 dpi: 102
    size: 477x268mm (18.8x10.6") diag: 547mm (21.5")
  OpenGL: renderer: Mesa Intel UHD Graphics 630 (CFL GT2)
    v: 4.6 Mesa 23.2.1-1ubuntu3.1~22.04.2 direct render: Yes
Audio:
  Device-1: Intel Cannon Lake PCH cAVS vendor: Lenovo driver: snd_hda_intel
    v: kernel bus-ID: 00:1f.3 chip-ID: 8086:a348 class-ID: 0403
  Device-2: NVIDIA vendor: Lenovo driver: snd_hda_intel v: kernel pcie:
    speed: 8 GT/s lanes: 16 bus-ID: 01:00.1 chip-ID: 10de:10fa class-ID: 0403
  Device-3: Lenovo ThinkPad Thunderbolt 3 Dock USB Audio type: USB
    driver: hid-generic,snd-usb-audio,usbhid bus-ID: 3-2.1.1.2:8
    chip-ID: 17ef:3083 class-ID: 0300 serial: <filter>
  Device-4: Logitech HD Webcam C910 type: USB
    driver: snd-usb-audio,uvcvideo bus-ID: 3-2.1.3:9 chip-ID: 046d:0821
    class-ID: 0e02 serial: <filter>
  Sound Server-1: ALSA v: k5.15.0-97-generic running: yes
  Sound Server-2: PulseAudio v: 15.99.1 running: yes
  Sound Server-3: PipeWire v: 0.3.48 running: yes
Network:
  Device-1: Intel Ethernet I219-V vendor: Lenovo driver: e1000e v: kernel
    port: N/A bus-ID: 00:1f.6 chip-ID: 8086:15bc class-ID: 0200
  IF: enp0s31f6 state: down mac: <filter>
  Device-2: Intel Wi-Fi 6 AX200 driver: iwlwifi v: kernel pcie:
    speed: 5 GT/s lanes: 1 bus-ID: 52:00.0 chip-ID: 8086:2723 class-ID: 0280
  IF: wlp82s0 state: up mac: <filter>
  Device-3: Lenovo ThinkPad TBT 3 Dock type: USB driver: r8152
    bus-ID: 4-2.1.2:4 chip-ID: 17ef:3082 class-ID: 0000 serial: <filter>
  IF: enx3ce1a1d088f7 state: up speed: 1000 Mbps duplex: full mac: <filter>
Bluetooth:
  Device-1: Intel AX200 Bluetooth type: USB driver: btusb v: 0.8
    bus-ID: 1-14:5 chip-ID: 8087:0029 class-ID: e001
  Report: hciconfig ID: hci0 rfk-id: 1 state: up address: <filter>
    bt-v: 3.0 lmp-v: 5.2 sub-v: 237e hci-v: 5.2 rev: 237e
Drives:
  Local Storage: total: 2.73 TiB used: 1.16 TiB (42.7%)
  ID-1: /dev/nvme0n1 vendor: Samsung model: SSD 970 EVO 1TB
    size: 931.51 GiB speed: 31.6 Gb/s lanes: 4 type: SSD serial: <filter>
    rev: 2B2QEXE7 temp: 43.9 C scheme: GPT
  ID-2: /dev/nvme1n1 vendor: Samsung model: SSD 970 EVO Plus 2TB
    size: 1.82 TiB speed: 31.6 Gb/s lanes: 4 type: SSD serial: <filter>
    rev: 2B2QEXM7 temp: 46.9 C scheme: GPT
Partition:
  ID-1: / size: 139.75 GiB used: 34.08 GiB (24.4%) fs: ext4
    dev: /dev/nvme0n1p1
  ID-2: /boot/efi size: 548.9 MiB used: 9.3 MiB (1.7%) fs: vfat
    dev: /dev/nvme0n1p2
  ID-3: /home size: 131.65 GiB used: 14.24 GiB (10.8%) fs: ext4
    dev: /dev/nvme0n1p5
Swap:
  ID-1: swap-1 type: partition size: 12.21 GiB used: 177.8 MiB (1.4%)
    priority: -2 dev: /dev/nvme0n1p6
Sensors:
  System Temperatures: cpu: 58.0 C mobo: N/A
  Fan Speeds (RPM): N/A
Info:
  Processes: 404 Uptime: 5h 26m wakeups: 55 Memory: 62.57 GiB
  used: 50.44 GiB (80.6%) Init: systemd v: 249 runlevel: 5 Compilers:
  gcc: 11.4.0 alt: 11/12 Shell: Bash v: 5.1.16 running-in: gnome-terminal
  inxi: 3.3.13

[all41]

run df -ahv in a terminal.
Look specifically at /

[AndyMH]

Look specifically at /

OP's inxi is showing plenty of space, if anything / is too big:

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Partition:
  ID-1: / size: 139.75 GiB used: 34.08 GiB (24.4%) fs: ext4
    dev: /dev/nvme0n1p1
  ID-2: /boot/efi size: 548.9 MiB used: 9.3 MiB (1.7%) fs: vfat
    dev: /dev/nvme0n1p2
  ID-3: /home size: 131.65 GiB used: 14.24 GiB (10.8%) fs: ext4
    dev: /dev/nvme0n1p5

What is the exact error/warning message and do you know where it is coming from?

[techenthudiast]

output of df -ahv :

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Filesystem      Size  Used Avail Use% Mounted on
sysfs              0     0     0    - /sys
proc               0     0     0    - /proc
udev             32G     0   32G   0% /dev
devpts             0     0     0    - /dev/pts
tmpfs           6.3G  2.4M  6.3G   1% /run
/dev/nvme0n1p1  140G   35G   99G  26% /
securityfs         0     0     0    - /sys/kernel/security
tmpfs            32G   57M   32G   1% /dev/shm
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
cgroup2            0     0     0    - /sys/fs/cgroup
pstore             0     0     0    - /sys/fs/pstore
efivarfs           0     0     0    - /sys/firmware/efi/efivars
bpf                0     0     0    - /sys/fs/bpf
systemd-1          -     -     -    - /proc/sys/fs/binfmt_misc
hugetlbfs          0     0     0    - /dev/hugepages
mqueue             0     0     0    - /dev/mqueue
debugfs            0     0     0    - /sys/kernel/debug
tracefs            0     0     0    - /sys/kernel/tracing
fusectl            0     0     0    - /sys/fs/fuse/connections
configfs           0     0     0    - /sys/kernel/config
none               0     0     0    - /run/credentials/systemd-sysusers.service
/dev/nvme0n1p2  549M  9.4M  540M   2% /boot/efi
/dev/nvme0n1p5  132G   15G  111G  12% /home
/dev/nvme1n1p2  295G   74G  206G  27% /mnt/5e38a45d-0daf-43f6-9579-0527f489acf8
/dev/nvme0n1p7  433G  411G  628M 100% /mnt/3b92ea25-2e45-41c8-97d3-58aa8141755e
/dev/nvme1n1p1  1.6T  661G  799G  46% /mnt/18d9d90c-6a44-45c1-b682-12a7f63ac6bb
binfmt_misc        0     0     0    - /proc/sys/fs/binfmt_misc
tmpfs           6.3G  152K  6.3G   1% /run/user/1000
gvfsd-fuse      0.0K  0.0K  0.0K    - /run/user/1000/gvfs
portal          0.0K  0.0K  0.0K    - /run/user/1000/doc

Re>

OP's inxi is showing plenty of space, if anything / is too big:

I did not realize that too big can be an issue.

Re>

What is the exact error/warning message and do you know where it is coming from?

The warning shows up on the login.

Low Disk Space on
"3b92ea25-2e45-41c8-97d3-58aa8141755e"
The volume "3b92ea25-2e45-41c8-97d3-58aa8141755e" has
only 703.6 MB disk space remaining. You may free up some
space by emptying the trash.

and today warning showed 628MB left.
Here is the problematic line as I understand:

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Filesystem      Size  Used Avail Use% Mounted on
/dev/nvme0n1p7  433G  411G  628M 100% /mnt/3b92ea25-2e45-41c8-97d3-58aa8141755e

How Size:433 - Used: 411 = 22GB translates to 628MB available?
I emptied the Trash. (I clicked on emptying the trash before in the dialog, it seems it did not do anything) so now

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Filesystem      Size  Used Avail Use% Mounted on
/dev/nvme0n1p7  433G  407G  4.4G  99% /mnt/3b92ea25-2e45-41c8-97d3-58aa8141755e

while better the math still does not make sense to me. It seems that system reserves part of the space on the partition without showing it.
I would love to understand where 22GB disappear or reserved for

Thank you

[AndyMH]

I would love to understand where 22GB disappear or reserved for

On linux filesystems the system reserves 5% for system use. This can be changed with tune2fs, but you are better clearing files off that partition.

[techenthudiast]

Thank you for your explanation.

Not sure if I need to start a new thread on this, so I will continue here due to context.

Two questions:
1. Due to big size of the partition does the system really needs 5% = 22GB? How much system actually needs

2. This "3b92ea25-2e45-41c8-97d3-58aa8141755e" is a partition on a drive that is used for storage, my system (on the same drive as this partition) has separate home and root partitions. Does the system really needs reserved space on storage partition?

Thank you

[AndyMH]

Does the system really needs reserved space on storage partition?

No, but that is what it does. I reduced the reserved space down to 1% on the partition on my backup drive.