Hi Markus, sounds really good this ZRAM! As I suffered from flash memory wear issues I am going to try it out.
There is a lot of information in this post. I would suggest to condense it a bit and place the most relevant part right in the beginning. Here some improve suggestions that it is easier to understand for all the people not so deep in the topic.
Blockquote
Rebooting … the former recommendation not to userebootorhaltis obsolete because all current OS seem to behave right. But nothing in life is 100% safe and it’s not wrong in principle so I keep it in the ‘known issues’ section for reference.
Reboot your system always with sudo reboot or sudo halt. The former recommendation not to use this commands is meanwhile obsolete.
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you must not switch off your openHABian server unless you have properly shut it down.
While this has been a requirement unrelated to ZRAM and essentially ever since UNIX exists, it’s amazing how many people still do this today. Put it on a UPS to safeguard it from power outages.
Switch off your system always with sudo shutdown -h. This ensures a proper shutdown and avoids the risk of a corrupted system. If you suffer from power outages it is highly recommended to us an UPS (Uninterruptible Power Supply).
I am missing a short section how to install:
How to Install
Upgrade your openhab to V2.5 Milestone 5 or newer. ZRAM can be installed from the Openhabian Configuration Tool. Choose “System Settings - Use ZRAM”. Reboot your system after installation.
Best
Thomas