Arch Linux

heytbone

Member

Registered: 2024-04-17

Posts: 11

Logical Volumes and Volume Groups size descrepancies

When trying to resize the logical volumes, I have conflicting information. I'm trying to adjust the size of the lv_root logical volume and add more space. While this shows as correct in lsblk as seen below, doing df -h yields different results. What do I do so that way I can access the newly allocated storage for /volgroup0/lv_root for install new software?

This is with lsblk

loop0                     7:0    0     4K  1 loop  /var/lib/snapd/snap/bare/5
loop1                     7:1    0  74.1M  1 loop  /var/lib/snapd/snap/core22/1033
loop2                     7:2    0   497M  1 loop  /var/lib/snapd/snap/gnome-42-2204/141
loop3                     7:3    0  74.2M  1 loop  /var/lib/snapd/snap/core22/1122
loop4                     7:4    0  91.7M  1 loop  /var/lib/snapd/snap/gtk-common-themes/1535
loop5                     7:5    0  70.9M  1 loop  /var/lib/snapd/snap/runelite/26
loop6                     7:6    0  70.9M  1 loop  /var/lib/snapd/snap/runelite/27
loop7                     7:7    0  39.1M  1 loop  /var/lib/snapd/snap/snapd/21184
loop8                     7:8    0  38.7M  1 loop  /var/lib/snapd/snap/snapd/21465
nvme0n1                 259:0    0 476.9G  0 disk
├─nvme0n1p1             259:1    0   512M  0 part
├─nvme0n1p2             259:2    0   512M  0 part  /boot
└─nvme0n1p3             259:3    0 475.9G  0 part
  └─volgroup0           254:0    0 475.9G  0 crypt
    ├─volgroup0-lv_root 254:1    0    70G  0 lvm   /
    └─volgroup0-lv_home 254:2    0 405.9G  0 lvm   /home

This is with df -h

dev                             16G     0   16G   0% /dev
run                             16G  1.8M   16G   1% /run
efivarfs                       192K   48K  140K  26% /sys/firmware/efi/efivars
/dev/mapper/volgroup0-lv_root   30G   28G  603M  98% /
tmpfs                           16G     0   16G   0% /dev/shm
tmpfs                           16G  8.0K   16G   1% /tmp
tmpfs                          1.0M     0  1.0M   0% /run/credentials/systemd-journald.service
tmpfs                          1.0M     0  1.0M   0% /run/credentials/systemd-udev-load-credentials.service
tmpfs                          1.0M     0  1.0M   0% /run/credentials/systemd-sysctl.service
tmpfs                          1.0M     0  1.0M   0% /run/credentials/systemd-tmpfiles-setup-dev-early.service
tmpfs                          1.0M     0  1.0M   0% /run/credentials/systemd-tmpfiles-setup-dev.service
/dev/mapper/volgroup0-lv_home   30G   27G  1.1G  97% /home
/dev/loop0                     128K  128K     0 100% /var/lib/snapd/snap/bare/5
/dev/loop6                      71M   71M     0 100% /var/lib/snapd/snap/runelite/27
/dev/loop7                      40M   40M     0 100% /var/lib/snapd/snap/snapd/21184
/dev/loop8                      39M   39M     0 100% /var/lib/snapd/snap/snapd/21465
/dev/loop3                      75M   75M     0 100% /var/lib/snapd/snap/core22/1122
/dev/loop1                      75M   75M     0 100% /var/lib/snapd/snap/core22/1033
/dev/loop2                     497M  497M     0 100% /var/lib/snapd/snap/gnome-42-2204/141
/dev/loop5                      71M   71M     0 100% /var/lib/snapd/snap/runelite/26
/dev/loop4                      92M   92M     0 100% /var/lib/snapd/snap/gtk-common-themes/1535
/dev/nvme0n1p2                 488M  160M  292M  36% /boot
tmpfs                          1.0M     0  1.0M   0% /run/credentials/systemd-vconsole-setup.service
tmpfs                          1.0M     0  1.0M   0% /run/credentials/systemd-tmpfiles-setup.service
tmpfs                          1.0M     0  1.0M   0% /run/credentials/getty@tty1.service
tmpfs                          3.2G   28K  3.2G   1% /run/user/1000

twelveeighty

Member

Registered: 2011-09-04

Posts: 1,452

Re: Logical Volumes and Volume Groups size descrepancies

pacman's check on whether a package can be installed is done by blocks, so check the number of available blocks reported by the file system (e.g. stat -f).

frostschutz

Member

Registered: 2013-11-15

Posts: 1,647

Re: Logical Volumes and Volume Groups size descrepancies

Seems like you (perhaps excessively) grow your LV but forgot to grow the filesystem along with it (resize2fs in case of ext4, different filesystems have different utilities for this). So the filesystems are still the old small size.

Note that if you assign 100% of your VG space, you won't be able to grow again or create other LV or snapshots in the future... and shrinking is much harder than growing (impossible for some filesystems).

So instead of going to 100% in one step, it might make sense to only grow as required (by +10G at a time) as it gives you more options with LVM.

Also remember to clear out your pacman caches and rotate logs to free up space on /.