the cpu-usage was 100% for more than one hour.
Contec-ISC pointed me to this thread of the forum:
https://community.sophos.com/products/unified-threat-management/astaroorg/f/81/t/65432
I didn't run the beta, but gave it a try.
Unfortunately it didn't solve the problem, but I had a direction to search for.
The "top" command didn't gave me much information. just a few processes which had a 15% load, but adding them all up didn't gave me the fully 100% load.
The next command was helpfull and showed me the process that took all the cpu resources:
ps -eo pcpu,pid,user,args | sort -k 1 -r | head -10
%CPU PID USER COMMAND
9.1 27922 root [confd.plx]
100 27985 root /usr/bin/perl /usr/local/bin/reporter/waf-reporter.pl
0.9 6883 postgres postgres: reporting reporting [local] idle
0.9 5829 root /usr/bin/cssd -d
0.8 5372 root /usr/sbin/syslog-ng -f /etc/syslog-ng.conf
0.8 4502 root /usr/local/bin/selfmonng.plx
0.6 7600 root /usr/sbin/ulogd -c /etc/ulogd.conf -d
0.6 4651 root /usr/sbin/conntrackd -d
0.5 4467 root /var/mdw/mdw.plx
So again it had something to do with the rrd files.
My solution was:
cd /var/log/reporting/rrd
mkdir bak
mv * bak
cp ./bak/*.rrd .
I moved all rrd data to a temporary directory.
Next I copied the data rrd files back to the rrd directory so I have my graph history back.
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