i have lastest version of observium on centos 6.9 (updated), but i can't execute command 

/usr/bin/rrdtool graph --daemon unix:/var/run/rrdcached/rrdcached.sock /tmp/deaGEezkxp3ZEtS3.png -Y --lower-limit 0 --upper-limit 100 --start 1520865855 --end 1520952255 --width 1152 --height 300 -c BACK#EEEEEE00 -c SHADEA#EEEEEE00 -c SHADEB#EEEEEE00 -c FONT#000000 -c CANVAS#FFFFFF00 -c GRID#a5a5a5 -c MGRID#FF9999 -c FRAME#5e5e5e -c ARROW#5e5e5e -R normal --font LEGEND:8:'DroidSansMono,DejaVuSansMono' --font AXIS:7:'DroidSansMono,DejaVuSansMono' --font-render-mode normal -E COMMENT:'Usage ' COMMENT:' Now' COMMENT:' Avg' COMMENT:' Min' COMMENT:' Max' COMMENT:'\l' DEF:ds0=10.250.16.1/processor-cpm-1000.rrd:usage:AVERAGE DEF:ds0min=10.250.16.1/processor-cpm-1000.rrd:usage:MIN DEF:ds0max=10.250.16.1/processor-cpm-1000.rrd:usage:MAX LINE1.25:ds0#1f78b4:'Switch 1 ' GPRINT:ds0:LAST:%6.1lf%s GPRINT:ds0:AVERAGE:%6.1lf%s GPRINT:ds0min:MIN:%6.1lf%s GPRINT:ds0max:MAX:%6.1lf%s COMMENT:'\l' HRULE:0#555555 

system return "Segmentation fault (core dumped)"

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Saluda cordialmente