Expand Nextcloud Disk

Sun, 14 Dec 2025 00:13:22 +0000

Backup any data before touching the drives! If it’s a VM, take a snapshot before doing anything! I can’t be responsible for any data loss - experiment on a throwaway VM first!

Here I go through the steps to expand the data drive of my Nextcloud install from 500GB to 1TB.

Confirm the drive size before any changes using lsblk, zfs list and zpool list

root@nextcloud:/home/ncadmin# lsblk
NAME                      MAJ:MIN RM  SIZE RO TYPE MOUNTPOINTS
sda                         8:0    0   60G  0 disk
├─sda1                      8:1    0    1G  0 part /boot/efi
├─sda2                      8:2    0    2G  0 part /boot
└─sda3                      8:3    0 56.9G  0 part
└─ubuntu--vg-ubuntu--lv   252:0    0 56.9G  0 lvm  /
sdb                         8:16   0  500G  0 disk
└─sdb1                      8:17   0  500G  0 part

root@nextcloud:/home/ncadmin# zfs list
NAME     USED  AVAIL  REFER  MOUNTPOINT
ncdata   321G   147G   321G  /mnt/ncdata

root@nextcloud:/home/ncadmin# zpool list
NAME     SIZE  ALLOC   FREE  CKPOINT  EXPANDSZ   FRAG    CAP  DEDUP    HEALTH  ALTROOT
ncdata   500G   321G   178G        -         -     9%    64%  1.00x    ONLINE  -

You can also confirm it all matches in the mount point:

ZFS on Steve's Tech Shed

Expand Nextcloud Disk