-v RAM 
-t [roof] memory utilization
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DEF:total=/var/www/mrtg/rrd/roof.memtotal.rrd:ds0:AVERAGE
DEF:used=/var/www/mrtg/rrd/roof.memtotal.rrd:ds1:AVERAGE
AREA:total#CC9A5780
LINE1:total#CC9A57
AREA:used#C7424E