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[Step 1, resize the proxmox virtual disk on Proxmox/Debian]

This old topic helped me out: https://forum.opnsense.org/index.php?topic=19250
I thought I would create a new topic here for me to refer to in future and to help anyone else out in the same position.

I have opnsense running on proxmox. Setup is rock solid, no complaints.
I found that Zenarmor was consuming more disk space once I got a faster internet connection.
This prompted me to increase the disk space on my opensense VM.

Here is how I did it.

Find the disk of your VM on proxmox.

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Step 1, resize the proxmox virtual disk on Proxmox/Debian

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ssh root@proxmox

root@proxmox:~# qm resize 100 scsi1 +120G
  Size of logical volume pve/vm-100-disk-1 changed from 30.00 GiB (7680 extents) to 150.00 GiB (38400 extents).
  Logical volume pve/vm-100-disk-1 successfully resized.

# originally wanted 150G but later decided i wanted 200G

root@proxmox:~# qm resize 100 scsi1 +50G
  Size of logical volume pve/vm-100-disk-1 changed from 150.00 GiB (38400 extents) to 200.00 GiB (51200 extents).
  Logical volume pve/vm-100-disk-1 successfully resized.

# checking size of the VM disk after resize

root@proxmox:~# fdisk /dev/mapper/pve-vm--100--disk--1 -l
Disk /dev/mapper/pve-vm--100--disk--1: 200 GiB, 214748364800 bytes, 419430400 sectors

Device                                  Start       End   Sectors   Size Type
/dev/mapper/pve-vm--100--disk--1-part1     40    532519    532480   260M EFI System
/dev/mapper/pve-vm--100--disk--1-part2 532520    533543      1024   512K FreeBSD boot
/dev/mapper/pve-vm--100--disk--1-part3 533544 419430359 418896816 199.7G FreeBSD UFS

Step 2, resize and then grow the file system on Opnsense/FreeBSD

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ssh root@OPNsense

root@OPNsense:~ # gpart show
=>      40  419430320  da0  GPT  (200G)
        40    532480    1  efi  (260M)
    532520      1024    2  freebsd-boot  (512K)
    533544  62380976    3  freebsd-ufs  (30G)
  62914520  356515840      - free -  (170G)

root@OPNsense:~ # gpart resize -i 3 da0
da0p3 resized

root@OPNsense:~ # gpart show
=>       40  419430320  da0  GPT  (200G)
         40     532480    1  efi  (260M)
     532520       1024    2  freebsd-boot  (512K)
     533544  418896816    3  freebsd-ufs  (200G)

root@OPNsense:~ # df -h
Filesystem                  Size    Used  Avail Capacity  Mounted on
/dev/gpt/rootfs              29G    12G    15G    44%    /

root@OPNsense:~ # growfs /
Device is mounted read-write; resizing will result in temporary write suspension for /.
It's strongly recommended to make a backup before growing the file system.
OK to grow filesystem on /dev/gpt/rootfs, mounted on /, from 30GB to 200GB? [yes/no] yes

root@OPNsense:~ # df -h
Filesystem                  Size    Used  Avail Capacity  Mounted on
/dev/gpt/rootfs              193G    12G    166G    7%    /