[lvs-users] Reasonable(?) Performance of LVS-NAT

Horst Venzke-Fa Remsnet Ltd support at remsnet.de
Thu May 23 17:01:43 BST 2013

   Hello Daryl,

   Simply add  second LVS cluster , split the traffik  via dns RR .

   Hope this helps.

   Mit freundlichen Grüßen / Best Regards
   Horst Venzke ; PGP NET : 1024G/082F2E6D ; http://www.remsnet.de
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   Gesendet: Donnerstag, 23. Mai 2013 um 17:04 Uhr
   Von: "daryl herzmann" <akrherz at iastate.edu>
   An: lvs-users at linuxvirtualserver.org
   Betreff: [lvs-users] Reasonable(?) Performance of LVS-NAT
   I have a LVS-NAT web cluster that seems to be nicely chugging along. My
   LVS director has the following specs:
   - Dell OptiPlex 745
   - Intel(R) Pentium(R) D CPU 3.40GHz
   - 4 GB Memory
   - BCM5754 Gigabit Ethernet PCI Express (two ports) [gro is disabled!]
   - RHEL6.4 64bit 2.6.32-358.6.2.el6.x86_64
   - ipvsadm 1.25-10
   The WAN and LAN connections are plugged into that Broadcom. I have GigE
   network on both sides.
   My monitoring tools indicate that:
   - My apache cluster maxes out around 8,000 requests per second
   - The individual apache nodes do not appear to be maxing CPU or
   out of available apache slots.
   - The throughput on the LVS director is maxing at about 32 MB/s
   - sar reporting on the LVS director shows %system maxing out at
   50% , which makes me to think the director is the bottleneck?
   - sar reports %user percentage is less than 1% and %idle at ~50%
   - `ipvsadm -L` indicates around 5,000 active and 700,000 inactive
   connections at the time of peak throughput
   Users are not reporting connection issues, just general slowness. So my
   questions for your kind consideration are:
   1) Do I have something obviously setup wrong or are these numbers about
   what you would expect for cheap hardware and a blissfully ignorant
   2) Am I right to think the director is the bottleneck or is there a
   better way to prove that?
   3) Should I dump NAT and move to DR or something else?
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