NAS 104 locking up

Hi!

I think I've fixed my RN104-box by changing the swappiness-value. Per (readynas-)default the swappiness is set to "0". This means that swapping will only be done if there is no more RAM left. This is - in my oppinion - a bad decision. Because of this slow onboard-controller there maybe is not enough time to swap-out when your processes hit the end of the RAM. My MySQL-instance always got kicked which shot the rsyslog-daemon to death and so on...

I changed the swappiness by adding a row to the end of the file /etc/sysctl.conf:

swappiness = 60

100 = swap everything (= also stupid and makes everything very slow) 60 = Linux default 0 = no swap - only swap if there is no more RAM (readynas-default)

Changing this value makes the setting reboot-aware / persistent.

You have to be "ROOT" (via ssh) to change these settings.

You can use this statement on the commandline :

echo swappiness = 60 >> /etc/sysctl.conf

This change is static and has only to be done once...

You'll have to reboot after changing this settings.
__________________________________________________

If you are not brave enough to change this system-file or want to check the behavior you can use following statement:

sysctl -w vm.swappiness=60

Remember: This is a dynamic change and has to be done every time after a reboot!!!

Have fun and good luck,
Roy