https://learning.oreilly.com/library/view/centos-7-linux/9781785887284/ch05s06.html#ch05lvl2sec149 – context: XFS, LVM https://learning.oreilly.com/library/view/linux-powerful-server/9781788293778/ch19s06.html#ch05lvl2sec0151 (by the same authors) In 2022 it looks a little unreasonable to not use LVM but only partitions. Resizing a filesystem on a partition (as opposed to on an LVM volume) should only be done, if / as long as the filesystem is not mounted on that partition. https://linuxconfig.org/how-to-resize-ext4-root-partition-live-without-umount […]