SWAP Files [KPTree Wiki]

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{{tag>linux debian swap setup disable enable configure partition fstab}}
=====SWAP Files=====
As I have a computer with enough memory I see no need or value in a SWAP partition. In fact as I am using a SSD for the system drive a SWAP is a concern to the reliability of his drive. The following is a list of method to check and disable SWAP function.
  *The command ''sudo swapoff -a"''turns of an existing SWAP partition. (''sudo swapon -a'' turns it back on)
  *To prevent a SWAP partition being mounted at boot comment out the swap partition in /etc/fstab, ''sudo vim /etc/fstab''. (Another open is to instead use the swapoff -a command in a boot cron job. This allows the swapon -a option to be later used.)
  *The command ''free -hw'' shows the current memory status.
  *Some links:
     *[[http://askubuntu.com/questions/214805/how-do-i-disable-swap|How do I disable swap?]] This article also refers to another that explains why turning of SWAP, even with a lot of RAM, may not be best, however this was written at a time SSD were not common and system RAM availability were in general significantly lower.
     *[[https://www.digitalocean.com/community/tutorials/how-to-add-swap-space-on-ubuntu-16-04|How To Add Swap Space on Ubuntu 16.04]]. It is interesting that this article also warns against use of SWAP partitions with SSD storage. This article also mentions the swappiness and vfs_cache_pressure setting.
See:
  *[[https://www.digitalocean.com/community/tutorials/how-to-add-swap-space-on-ubuntu-16-04|How To Add Swap Space on Ubuntu 16.04]] section on cache pressure on how to adjust this parameter.
  *[[https://www.howtogeek.com/449691/what-is-swapiness-on-linux-and-how-to-change-it/|What Is Swappiness on Linux? (and How to Change It)]]
  *[[https://ahmedzbyr.gitlab.io/hadoop/linux/swapiness-set/|How To Configure Swappiness]]

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