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Originally Posted by KevinH Zimbra assumes it's the only application. So my guess is running the other apps are starving the total system of RAM and forcing zimbra and the other apps to use swap. You should use zmlocalconfig to lower the ram percentages for tomcat/java and mysql. I'd also experiment with zimbra with your other applications off. My guess is under both those conditions you'll see a much happier system. Our internal mail server has only local disk and 2GB RAM, but with dual 2.8GHz cpus and works fine for a much larger group of folks who are very very heavy mail users most with multiple GB mailboxes.
[zimbra@mail ~]$ zmlocalconfig |grep mem
mysql_memory_percent = 40
tomcat_java_heap_memory_percent = 30 |
Thanks Kevin
Ideally I would love to have a seperate server just to handle mail, but we can't practically do that right now. What I do plan on doing is moving zimbra to a secondary machine that, while it is running other services they are non-essential. That will free up the memory we absolutely have to have on our primary webserver. I will then do the suggested config changes to keep zimbra "under control" when it comes to using memory and see if that helps the overall system performance. Hopefully that willl give us a much nicer balance.
I'll post results here when I've completed these things.