I'm running up Zimbra (5.0.15) and have suddenly started experiencing major performance problems. Starting yesterday lots of operations started lagging. Any time you move an email to another folder (Imap and web client), send a message (web client), or create/delete a calendar appointment, the processes hangs for 5-30 seconds before completing. The box itself is not loaded and as far as I can tell is not suffering from lagging drives, bad networking, etc. Everything else on the box seems to be fine and it appears to be an internal zimbra problem. There are only 15 users on the box right now and until yesterday everything was working well. Nothing has been changed in Zimbra or the OS. Has anyone else seen this or have any ideas as to how to figure it out? I can find no indication in any logs that anything is amiss.
Release 5.0.15_GA_2851.UBUNTU8_64 UBUNTU8_64 NETWORK edition
running on Ubuntu 8.04
2 X Quad-Core AMD Opteron 2376