Changes in Orientbell Zimbra for Performance issue on 28th June 2014

Change at Network/Kernel Level in /etc/sysctl.conf

net.ipv4.tcp_fin_timeout=15
net.ipv4.tcp_tw_reuse=1
net.ipv4.tcp_tw_recycle=1

Activate it via sysctl -p

Disable unwanted Services

chkconfig autofs off
service autofs stop
chkconfig netfs off
service netfs stop
chkconfig cups off
service cups stop
chkconfig nfslock off
service nfslock stop
chkconfig portmap off
service portmap stop
chkconfig rpcgssd off
service rpcgssd stop
chkconfig rpcidmapd off
service rpcidmapd stop

Zimbra Mail Box Tuning

zmlocalconfig -e mailboxd_java_heap_memory_percent=25
zmlocalconfig -e zimbra_require_interprocess_security=0
zmlocalconfig -e mailboxd_java_options="-server -Djava.awt.headless=true \
   -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:NewRatio=2 \
   -XX:PermSize=196m -XX:MaxPermSize=350m -XX:SoftRefLRUPolicyMSPerMB=1 \
   -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps \
   -XX:+PrintGCApplicationStoppedTime \
   -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/opt/zimbra/log \
   -XX:ErrorFile=/opt/zimbra/log/hs_err_pid%p.log"

Restart Zimbra .