Astaro has hte kernel swappiness set to 60. I ahve 2 gigs of ram in my machine and as per the following thread I am using hte mem option:
https://community.sophos.com/products/unified-threat-management/astaroorg/f/55/t/44899
However since my ram usage stays below 40% there's no reason for the box to touch swap. It turns out the default swappiness of the 2.6 linux kernel is 60. This means the machine is more likely to keep files cached in ram and nOT evacuate them to disk when needed. The swappiness value should be reduced to zero..here's how:
login as root to the box
joe /etc/sysctl.conf
at the bottom type vm.swappiness=0
ctrl-k x
reboot the box.
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