Unlike my previous experiment with building NAStie installing this variant of linux onto LVM-only partitions proved difficult. My attempts left my sleep schedule a bit tweaked, and my disgust for "au­to­mat­ed" con­fig­u­ra­tion-file-building-scripts found new purpose. That aside, what worked when I installed Arch linux on LVM partitions is below.

• Install Arch using the standard install tool.

• While doing this, refer to the Arch Wiki page on LVM and follow its in­struc­tions until it talks about changing the grub con­fig­u­ra­tion file.

• Assigning (VolumeGroupLabel-LogicalVolumeLabel) to GRUB_DE­VICE in /etc/default/grub will cause the /boot/grub/grub.cfg-building script to insert the parameter 'root=(Vol­umeGrou­pLa­bel-Log­i­calVol­ume­La­bel)' when building the kernel's command-line. This does not work. Once the /boot/grub/grub.cfg file is build by grub-mkconfig, edit the /boot/grub/grub.cfg file to change the kernel's root parameter to 'root=/dev/mapper/Vol­umeGrou­pLa­bel-Log­i­calVol­ume­La­bel' (gathered from various sources including the LVM section on the Arch Wiki GRUB2 page).

• Boot happily ever after.

This is quick and dirty, but I wanted it documented for the next time I try this.