We have plan to deploy Zimbra server that will send large number emails. 5000 Mail per minute. Receiving mails/lmtp will be near 0.

Following is the system specs

Server Class: Sun X2200M2
RAM: 32GB
CPU: AMD Quad-Core
NIC: 4 x 100Gbps
Hard disk size: 2 x 250 GB(SATA 7200rpm)
RAID: Raid 1
Available H/D size: 250GB

We are going to install 2 Virtual machines on this system. Both Vhost share the system recourse equally.

After my research, i am going to change following Zimbra/OS parameters

innodb_buffer_pool_size = 30% of memory
table_cache- 1200 to 2000
innodb_open_files= 4310
mailboxd_java_heap_memory_percent = 25%
#zmlocalconfig -e mailboxd_java_options="-server -Djava.awt.headless=true -XX:+UseConcMarkSweepGC -XX:NewRatio=2 -XX:PermSize=128m -XX:MaxPermSize=128m -XX:SoftRefLRUPolicyMSPerMB=1 -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCApplicationStoppedTime"

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

Please let me know if it works or do i need to change any other settings.

MY