Title: Create a new OpenBSD partition from unused space

	Title: Create a new OpenBSD partition from unused space
	Author: Solène
	Date: 20 September 2018
	Tags: openbsd highlight
	Description:

	The default OpenBSD partition layout uses a pre-defined template. If
	you have a disk more than 356 GB you will have unused space with the
	default layout (346 GB before 6.4).

	It's possible to create a new partition to use that space if you did
	not modify the default layout at installation. You only need to start
	disklabel with flag -E* and type a to add a partition,
	default will use all remaining space for the partition.

	# disklabel -E sd0
	Label editor (enter '?' for help at any prompt)
	> a
	partition: [m]
	offset: [741349952]
	size: [258863586]
	FS type: [4.2BSD]
	> w
	> q
	No label changes.

	The new partition here is m. We can format it with:

	# newfs /dev/rsd0m

	Then, you should add it to your /etc/fstab, for that, use the same
	uuid as for other partitions, it would look something like
	52fdd1ce48744600

	52fdd1ce48744600.e /data ffs rw,nodev,nosuid 1 2

	It will be auto mounted at boot, you only need to create the folder
	/data. Now you can do

	# mkdir /data
	# mount /data

	and /data is usable right now.

	You can read [disklabel(8)](https://man.openbsd.org/disklabel.8) and
	[newfs](https://man.openbsd.org/newfs.8) for more informations.