Proxmox - Resize PVE Root

Why?

When installing proxmox from iso its give a lot storage to pve-data which is a volume-storage and not a lot for pve-root, and pve-root it’s where your filesystem is mounted.

Check current storage

First of all, lets check how much we have in all of our volume-storage:

lvdisplay

The output should be something like this:

root@pve:~# lvdisplay 
  --- Logical volume ---
  LV Path                /dev/pve/swap
  LV Name                swap
  VG Name                pve
  LV UUID                niOT4X-rcyP-dKCD-sqAK-SWxy-dto9-vlbNjj
  LV Write Access        read/write
  LV Creation host, time proxmox, 2020-05-04 10:39:46 +0300
  LV Status              available
  # open                 2
  LV Size                7.00 GiB
  Current LE             1792
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Logical volume ---
  LV Path                /dev/pve/root
  LV Name                root
  VG Name                pve
  LV UUID                OrPb0H-h1lm-OzZ8-C02y-6FHy-RAuV-ppfrQp
  LV Write Access        read/write
  LV Creation host, time proxmox, 2020-05-04 10:39:46 +0300
  LV Status              available
  # open                 1
  LV Size                14.75 GiB
  Current LE             3776
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
   
  --- Logical volume ---
  LV Name                data
  VG Name                pve
  LV UUID                3O0Z5M-uV0c-tCXH-8Sz0-XZrk-2rZY-qQkvuR
  LV Write Access        read/write
  LV Creation host, time proxmox, 2020-05-04 10:39:46 +0300
  LV Pool metadata       data_tmeta
  LV Pool data           data_tdata
  LV Status              available
  # open                 0
  LV Size                28.37 GiB
  Allocated pool data    0.00%
  Allocated metadata     0.02%
  Current LE             7263
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:4

As we can see there is 28.37 GiB in pve-data and only 14.75 GiB in pve-root.

Resize

For example, if we want to resize our pve-data to be 10 GiB and also give pve-root the rest of the space, we can do it by do it as follows:

# remove pve-data logical volume.
lvremove /dev/pve/data -y

# create it again with new size.
lvcreate -L 10G -n data pve -T

# give pve-root all the other size.
lvresize -l +100%FREE /dev/pve/root

# resize pve-root file system
resize2fs /dev/mapper/pve-root

Verfiy

Now you can check the new resized values by using:

lvdisplay