Please whitelist cPanel in your adblocker so that you’re able to see our version release promotions, thanks!

The Community Forums

Interact with an entire community of cPanel & WHM users!

performance effect of mbox to maildir upgrade

Discussion in 'E-mail Discussion' started by carlaron, Nov 1, 2007.

  1. carlaron

    carlaron Well-Known Member

    Jun 26, 2003
    Likes Received:
    Trophy Points:
    Does anyone know whether my delaying the move to mbox (for various reasons) would contribute to my high load?

    I was assuming that it was mostly all the spam coming in, and my system dealing with it... exim and spamd are ususally high, and turning off exim (and spamd with it) during a high load spike always brings the load right down.

    But perhaps it is also an inefficiant mbox that is slowing down exim and making it work harder?

    Or perhaps making cppop work harder? Most of the time high load is exim, but once in a while cppop jumps to the top of "top".

    If mbox is not contrbituing to the high load, then I will put off the upgrade on that until I deal with the high loads from exim problem, and have time to prepare the 400 or so email users for the switchover...
  2. cPanelDavidG

    cPanelDavidG Technical Product Specialist

    Nov 29, 2006
    Likes Received:
    Trophy Points:
    Houston, TX
    cPanel Access Level:
    Root Administrator
    I'd recommend migrating to maildir if you are seeing cppop (only used on mbox) eating a lot of CPU. mbox is an inherently inefficient method of storing mail (to access a message in the inbox, you must sort through a single file containing the entire contents of the inbox). I know some sysAdmins have reported noticably (or in rare cases: very noticably) lower loads after migrating to maildir. Perhaps you may be one of those relatively rare cases where converting to maildir will have a significant positive impact on server loads, but that's just speculation on my part.

    Once you convert to maildir, Courier and Courier-IMAP will handle POP3 and IMAP functionality rather than cppop.

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice