Which hooks should mkinitcpio.conf have?

[Aragorn]

If this is an existing installation in which you are going to split off /usr, then do make sure you read my HowTo below.

[Tip] Root filesystem nearly full but got a spare partition sitting around? Split off some stuff!

Difficulty: ★★★☆☆ Introduction As you should all already know by now, GNU/Linux is a FLOSS variant of the UNIX operating system design, and UNIX does not know the concept of drive letters, nor does it approach storage from the vantage of having different volumes. Instead, everything is mounted into a uniform directory hierarchy, so that regardless of what physical medium any particular group of files resides on ─ even if this physical medium is actually located in another computer across the …

If on the other hand it’s a new installation, then make sure you modify /etc/mkinitcpio.conf and rebuild the initcpios for all of your kernels before rebooting, because Calamares does not set up the required hooks for a separate /usr partition or an @usr btrfs subvolume. I discovered that the hard way.