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Document URL:
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/ch-swapspace
Section Number and Name:
CHAPTER 15. SWAP SPACE
Describe the issue:
When changing /etc/fstab online in a systemd environment, a 'systemctl daemon-reload' must be run. After editing your /etc/fstab with the sed command, you'll need to run a 'systemctl daemon-reload'. The fstab isn't read and the mount units generated until that is run. Without that, you will have a mount unit created for the old swap LV that will attempt to mount whenever your trigger a udev change event.
Suggestions for improvement:
Maybe a hint at the end of the page. "If editing /etc/fstab online, ie. with no reboot, then 'systemctl daemon-reload' should be run afterwards to update systemd daemon"