RRDTool error on some hosts

[mrscary]

Ok 99% of everything is graphing properly.. but i am finding a couple of my hosts acting strange.
One host in particular, i can watch the graphs of his Mem, Disk, etc in real time, but it's not generating a graph.
BUT i have a graph to show me how many processes are running, and that one works.

When i put a graph that is just showing me RRDTool Error in debug mode, below is my result
RRDtool Command:
c:/rrdtool/rrdtool.exe graph - \
--imgformat=PNG \
--start="-86400" \
--end="-300" \
--pango-markup \
--title="COMPUTERNAME - Traffic - wireless_32768" \
--vertical-label="bits per second" \
--slope-mode \
--base=1000 \
--height=200 \
--width=700 \
--rigid \
--alt-autoscale-max \
--lower-limit="0" \
COMMENT:"From 09/10/2020 06\:15\:17 To 09/11/2020 06\:10\:17\c" \
COMMENT:" \n" \
--border 1 --font TITLE:14:"Times New Roman bold" \
--font AXIS:12:"arial bold" \
--font LEGEND:12:"arial bold" \
--font UNIT:14:"arial bold" \
--font WATERMARK:8: \
--slope-mode \
DEF:a="C\:/inetpub/wwwroot/cacti/rra/COMPUTERNAME_traffic_in_1250.rrd":"traffic_in":AVERAGE \
DEF:b="C\:/inetpub/wwwroot/cacti/rra/COMPUTERNAME_traffic_in_1250.rrd":"traffic_out":AVERAGE \
CDEF:cdefa="a,8,*" \
CDEF:cdeff="b,8,*" \
CDEF:cdefbe="b,8,*,-1,*" \
LINE1:cdefa#00CF00FF: \
AREA:cdefa#00CF007F:"Inbound " \
GPRINT:cdefa:LAST:"Current\:%8.2lf %s" \
GPRINT:cdefa:AVERAGE:"Average\:%8.2lf %s" \
GPRINT:cdefa:MAX:"Maximum\:%8.2lf %s\n" \
LINE1:cdeff#002A97FF: \
LINE1:cdefa#005D57FF:"Peak Usage\n" \
AREA:cdeff#002A977F:"Outbound " \
GPRINT:cdeff:LAST:"Current\:%8.2lf %s" \
GPRINT:cdeff:AVERAGE:"Average\:%8.2lf %s" \
GPRINT:cdeff:MAX:"Maximum\:%8.2lf %s\n" \
COMMENT:" \n" \
HRULE:0#FF0000FF:"95th Percentile" \
COMMENT:"(0 mbit in+out)" \
LINE1:cdefbe#0000AAFF:"Peak Usage\n"
RRDtool Command lengths = 1312 charaters.
RRDtool Says:
ERROR: short read while reading header rrd->stat_head


so, What the heck is this short read error , and what should I do to fix it?

[mrscary]

anyone got any input on this one?

[TheWitness]

Looks like disk corruption. You may have to delete the RRDfile and let Cacti re-create it.

[mrscary]

i will try that and let you know for sure.

[mrscary]

i deleted all the rrd files for this host under cacti/rrd.
i refreshed the page where i was looking at the graph's debug page. it made a new rrd file, but same error.

[mrscary]

waited for a new cycle time.. now i get the "OK"..
weird as this is an issue i started seeing on the latest revision of CACTI on windows.

[TheWitness]

Could be a problem with the version of RRDtool. You should look for something more recent.

[mrscary]

i am running 1.7.2.
i notice cacti has a drop down for 1.8, but i cant find 1.8 for windows to download.

[TheWitness]

Maybe go in the other direction then.