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⚠ Resizing any live partition without unmounting it first comes with a tremendous risk of losing data, thus it is not recommended. The proper method is to unmount the partition and resize it while booted into rescue CD OpenBSD has no solution yet, please read the dedicated item

In the panel, select the new size and confirm

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Find the partition to extend using df

df -h | grep '/$' | awk '{ print $1}'

Check the new partition set a test on next boot and reboot (vda in the example bellow, change regarding the result of the previous command)

resize2fs -f /dev/vda

To check the new partition set a test on next boot and reboot

touch /forcefsck
reboot

After the next reboot the system is checked and safe.

All in one:

resize2fs -f $(df -h | grep '/$' | awk '{ print $1}')
touch /forcefsck
reboot

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Using Debian, the process is automatic.

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Locate the disk device name (/dev/vdx) and the partition number hosting / (/dev/vda and 4 in that example)

lsblk

To collect only the / partition:

lsblk | grep '/$'

Run the command bellow (update the information according to your partitioning, vda + 4 in that example)

growpart /dev/vda 4 && resize2fs /dev/vda4

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Enter the disk partitioner using the disk device name

fdisk /dev/vda

You can enter p to print the disk information and confirm this is the correct one.

Delete the partition containing / (4 in that example, change according to your partitioning)

d
4

Create a new partition for / (4 in that example, change according to your partitioning)

n
4
<press return>
<press return>

A red message might appear asking if you want to keep the original signature, enter N for no

N

Enter w for saving the changes

w

Now the partition is extended.

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To check the new partition set a test on next boot and reboot

touch /forcefsck
reboot

After the next reboot the system is checked and safe.

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Locate your zfs root partition

gpart show

Correct the partition table (replace vtbd0 with the result of gpart show)

gpart recover /dev/vtbd0
fsck -F /dev/vtbd0

Grow the zfs root partition (replace vtbd0 with the result of gpart show, -i 4 with -i your partition number )

gpart resize -i 4 -a 4k vtbd0

Increase the zfs root size (replace vtbd0 with the result of gpart show, and 4 with your partition number )

zpool online -e $(zpool get all | cut -d ' ' -f 1 | head -n 2| tail -n 1) /dev/vtbd0p4

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Go to the control panel and select Rescue mode

Select OpenBSD install CD

Go to the console and wait. When the prompt ask your interaction, enter the shell.

s

Create the main drive device.

cd /dev
sh MAKEDEV sd0

Enter the partitioning edition mode

fdisk -e sd0

enter:

e 3

Type 3 times return and manually set the maximum value written between brackets after “Partition size”

type

w

type

q

Enter the partitioning mode

Disklabel -E sd0

type

b

Press return

type

*

type

w

Now resize the / partition: type

c a

type

*

type

w

type

q

Grow the partition:

growfs sd0a

confirm if you have a backup

Check for bad blocks

fsck_ffs /dev/sd0a

When asked for “MARK FILE SYSTEM CLEAN?”, confirm entering

F

Disable the Rescue mode, the server will reboot. If needed enter the command

reboot

in the shell