Friday, 23 July 2021

A reprise - growing disks in Ubuntu

 I've written this many times over the years, with many different Linux distributions, but had a need to REDO FROM START yesterday, growing the disk within an Ubuntu VM running on VMware Fusion.

So, for my future self, this is what worked for me ( using Ubuntu 20.04.02 LTS )

Look at the current disk

df -kmh /

Filesystem                         Size  Used Avail Use% Mounted on

/dev/mapper/ubuntu--vg-ubuntu--lv   19G  8.5G  9.2G  49% /

Increase VM from 20 to 50 GB

This is easily done via VMware Fusion: -


I grew the disk from 20 GB to 50 GB whilst the VM was shutdown, and then booted it up.

Inspect the current partition layout

fdisk /dev/sda -l

GPT PMBR size mismatch (41943039 != 104857599) will be corrected by write.

Disk /dev/sda: 50 GiB, 53687091200 bytes, 104857600 sectors

Disk model: VMware Virtual S

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: DA7D21AD-C6E5-4549-B753-391F2EB88C8E


Device       Start      End  Sectors Size Type

/dev/sda1     2048     4095     2048   1M BIOS boot

/dev/sda2     4096  2101247  2097152   1G Linux filesystem

/dev/sda3  2101248 41940991 39839744  19G Linux filesystem

Create a new partition

I did this via CLI, but could've quite easily used fdisk interactively. Also, I took the defaults on start, end, sectors, partition type etc.

(

echo "n"

echo -e "\n"

echo -e "\n"

echo -e "\n"

echo "w"

) | fdisk /dev/sda

Inspect the new partition layout

fdisk /dev/sda -l

Disk /dev/sda: 50 GiB, 53687091200 bytes, 104857600 sectors

Disk model: VMware Virtual S

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: DA7D21AD-C6E5-4549-B753-391F2EB88C8E


Device        Start       End  Sectors Size Type

/dev/sda1      2048      4095     2048   1M BIOS boot

/dev/sda2      4096   2101247  2097152   1G Linux filesystem

/dev/sda3   2101248  41940991 39839744  19G Linux filesystem

/dev/sda4  41940992 104857566 62916575  30G Linux filesystem

Create a Physical Volume using the new sda4 partition

pvcreate /dev/sda4

  Physical volume "/dev/sda4" successfully created.

Extend the existing Volume Group to use the new sda4 partition  

vgextend /dev/ubuntu-vg/ /dev/sda4

  Volume group "ubuntu-vg" successfully extended

Extend the Logical Volume to fit

- Note that I deliberately chose the value of 29G to fit inside the newly added 30GB of disk

lvextend -L +29G /dev/ubuntu-vg/ubuntu-lv

  Size of logical volume ubuntu-vg/ubuntu-lv changed from <19.00 GiB (4863 extents) to <48.00 GiB (12287 extents).

  Logical volume ubuntu-vg/ubuntu-lv successfully resized.

Resize the file-system to fit  

resize2fs /dev/mapper/ubuntu--vg-ubuntu--lv

resize2fs 1.45.5 (07-Jan-2020)

Filesystem at /dev/mapper/ubuntu--vg-ubuntu--lv is mounted on /; on-line resizing required

old_desc_blocks = 3, new_desc_blocks = 6

The filesystem on /dev/mapper/ubuntu--vg-ubuntu--lv is now 12581888 (4k) blocks long.

Look at the current disk

df -kmh /

Filesystem                         Size  Used Avail Use% Mounted on

/dev/mapper/ubuntu--vg-ubuntu--lv   48G  8.5G   37G  19% /

Celebrate !


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