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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"

The updated content is now published on the Customer Portal:

* 15.1.2. Creating an LVM2 Logical Volume for Swap
  https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/ch-swapspace#swap-creating-lvm2

* 15.1.3. Creating a Swap File
  https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/ch-swapspace#swap-creating-file

* 15.2.2. Removing an LVM2 Logical Volume for Swap
  https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/s1-swap-removing#swap-removing-lvm2

* 15.2.3. Removing a Swap File
  https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/s1-swap-removing#swap-removing-file

* 8.3.1. Mounting NFS File Systems Using /etc/fstab
  https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/nfs-clientconfig#s2-nfs-fstab

* 13.2.3. Add the Partition to /etc/fstab
  https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/s2-disk-storage-parted-create-part#s3-disk-storage-parted-create-part-fstab

* 13.3. Removing a Partition
  https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/s2-disk-storage-parted-remove-part


Thanks for your help. I'm closing this bug as CURRENTRELEASE.