I successfully upgraded from the most recent 4.x version of OTRS to 5.0.9 and noticed a sudden increase in memory usage: The machine starts to use swap, and when checking which processes are using the most swap I'm seeing: otrs:~# { date;for f in /proc/[0-9]*/status; do awk '{k[$1]=$2} END { if (k["VmSwap:"]) print k["Pid:"],k["Name:"],k["VmSwap:"];}' $f 2>/dev/null; done | sort -n ; } Mi 20. Apr 15:55:05 CEST 2016 1 init 600 ... 26138 otrs.Daemon.pl 8240 26169 /usr/sbin/apach 4964 26243 /usr/sbin/apach 4832 26311 /usr/sbin/apach 4916 26835 /usr/sbin/apach 5136 27219 /usr/sbin/apach 5136 27701 /usr/sbin/apach 8528 27711 /usr/sbin/apach 5108 27746 /usr/sbin/apach 5256 27747 /usr/sbin/apach 8532 So it's apache/mod_perl. Is that normal? -- Ralf Hildebrandt Charite Universitätsmedizin Berlin ralf.hildebrandt@charite.de Campus Benjamin Franklin http://www.charite.de Hindenburgdamm 30, 12203 Berlin Geschäftsbereich IT, Abt. Netzwerk fon: +49-30-450.570.155