Ben's notes

You will lose files in tmpfs after reboot! Use remote syslog for important logs if you log to tmpfs.

tmpfs   /var/log   tmpfs   defaults,size=256m  0 0
tmpfs   /tmp       tmpfs   defaults,size=64m  0 0

You can change the ext4 journal commit interval to reduce writes.

Quote: https://www.kernel.org/doc/Documentation/filesystems/ext4.txt

commit=nrsec	(*)	Ext4 can be told to sync all its data and metadata
			every 'nrsec' seconds. The default value is 5 seconds.
			This means that if you lose your power, you will lose
			as much as the latest 5 seconds of work (your
			filesystem will not be damaged though, thanks to the
			journaling).  This default value (or any low value)
			will hurt performance, but it's good for data-safety.
			Setting it to 0 will have the same effect as leaving
			it at the default (5 seconds).
			Setting it to very large values will improve
			performance.

Edit /etc/fstab and add a commit= key value pair.

/dev/mapper/vg_apu1-lv_root /                   ext4    defaults,noatime,discard,errors=remount-ro,commit=60        1 1