Ubuntu resize an ext4 partition without LVM

This post will tell you how to make the partition extend to full disk after resizing the disk.

First, check current usage:

sudo df -Th

We will resize sdb1.

sudo fdisk /dev/sdb

n – Create partition
p – print partition table
g - reset as GPT partition table
d – delete a partition
q – exit without saving the changes
w – write the changes and exit.

Run:

This will delete the partiton. Select 1.

Run:

This will create a partiton. Select the start point and end point. Start should be the original start. End should be the end of the disk. Usually you can keep those values default.

Run:

To write those changes to partition table.

Run:

sudo resize2fs /dev/sdb1

To make file system understand that partiton table is changed.

Run:

sudo df -Th

To see if the system recognize the new partiton. (You may need rebooting to see the size changes)

Full demo:

<div style="display:inline-block;white-space:pre;background-color:#2C001E;font-family:'Cascadia Code',monospace;font-size:12pt;padding:4px;">Welcome to Ubuntu 22.04.1 LTS (GNU/Linux 5.15.0-48-generic x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage System information as of Fri Oct 7 06:22:25 PM UTC 2022 System load: 2.16015625 Processes: 414 Usage of /: 26.5% of 62.69GB Users logged in: 0 Memory usage: 5% IPv4 address for ens160: 192.168.50.31 Swap usage: 0% * Super-optimized for small spaces - read how we shrank the memory footprint of MicroK8s to make it the smallest full K8s around. https://ubuntu.com/blog/microk8s-memory-optimisation 0 updates can be applied immediately. Web console: https://nextcloud:9090/ or https://192.168.50.31:9090/ Last login: Fri Oct 7 17:08:07 2022 from 192.168.50.121 anduin@nextcloud:_{$ sudo df -Th Filesystem Type Size Used Avail Use% Mounted on tmpfs tmpfs 1.6G 1.4M 1.6G 1% /run /dev/sda2 ext4 63G 17G 43G 28% / tmpfs tmpfs 7.9G 0 7.9G 0% /dev/shm tmpfs tmpfs 5.0M 0 5.0M 0% /run/lock /dev/sdb1 ext4 885G 393G 447G 47% /mnt/datastorage //vault/Shared cifs 3.5T 1.2T 2.4T 32% /mnt/Shared //vault/NextcloudBackup cifs 3.5T 1.2T 2.4T 32% /mnt/Backup tmpfs tmpfs 1.6G 4.0K 1.6G 1% /run/user/1000 anduin@nextcloud:}$ sudo fdisk /dev/sdb Welcome to fdisk (util-linux 2.37.2). Changes will remain in memory only, until you decide to write them. Be careful before using the write command. GPT PMBR size mismatch (1887436799 != 8589934591) will be corrected by write. This disk is currently in use - repartitioning is probably a bad idea. It's recommended to umount all file systems, and swapoff all swap partitions on this disk. Command (m for help): p Disk /dev/sdb: 4 TiB, 4398046511104 bytes, 8589934592 sectors Disk model: Virtual disk Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: gpt Disk identifier: DDBA19F6-857E-E048-81F6-A9E61B90C683 Device Start End Sectors Size Type /dev/sdb1 2048 1887436766 1887434719 900G Linux filesystem Command (m for help): d Selected partition 1 Partition 1 has been deleted. Command (m for help): n Partition number (1-128, default 1): First sector (2048-8589934558, default 2048): Last sector, +/-sectors or +/-size{K,M,G,T,P} (2048-8589934558, default 8589934558): Created a new partition 1 of type 'Linux filesystem' and of size 4 TiB. Partition #1 contains a ext4 signature. Do you want to remove the signature? [Y]es/[N]o: N Command (m for help): p Disk /dev/sdb: 4 TiB, 4398046511104 bytes, 8589934592 sectors Disk model: Virtual disk Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: gpt Disk identifier: DDBA19F6-857E-E048-81F6-A9E61B90C683 Device Start End Sectors Size Type /dev/sdb1 2048 8589934558 8589932511 4T Linux filesystem Command (m for help): w The partition table has been altered. Syncing disks. anduin@nextcloud:_{$ sudo resize2fs /dev/sdb1 resize2fs 1.46.5 (30-Dec-2021) Filesystem at /dev/sdb1 is mounted on /mnt/datastorage; on-line resizing required old_desc_blocks = 113, new_desc_blocks = 512 The filesystem on /dev/sdb1 is now 1073741563 (4k) blocks long. anduin@nextcloud:}$ sudo df -Th Filesystem Type Size Used Avail Use% Mounted on tmpfs tmpfs 1.6G 1.4M 1.6G 1% /run /dev/sda2 ext4 63G 17G 43G 28% / tmpfs tmpfs 7.9G 0 7.9G 0% /dev/shm tmpfs tmpfs 5.0M 0 5.0M 0% /run/lock /dev/sdb1 ext4 4.0T 393G 3.4T 11% /mnt/datastorage //vault/Shared cifs 3.5T 1.2T 2.4T 32% /mnt/Shared //vault/NextcloudBackup cifs 3.5T 1.2T 2.4T 32% /mnt/Backup tmpfs tmpfs 1.6G 4.0K 1.6G 1% /run/user/1000</div>

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