===Reduce swappiness===
If you have enough RAM, then you can reduce swappiness and thus avoid writes to swap.

  * Check current setting: <code>cat /proc/sys/vm/swappiness
cat /proc/sys/vm/vfs_cache_pressure</code>
  * Change setting, edit **/etc/sysctl.d/swappiness.conf**. <code>mkdir -p /etc/sysctl.d
vi /etc/sysctl.d/swappiness.conf</code><code>vm.swappiness=1
vm.vfs_cache_pressure=50</code>
  * Then activate the change. <code>sysctl -p /etc/sysctl.d/swappiness.conf</code>