IMAP very slow

Discussion in 'General' started by mattltm, Jan 16, 2014.

  1. mattltm

    mattltm Member

    I seem to have a small issue with IMAP connections.

    They get very slow (taking around 40 seconds to download a single message). If I reboot the server then the IMAP connection is fast for a few hours before slowing down again.

    The server load average is around 0.02 - 0.05 and I can't see any problems in the mail log.

    Any ideas as to what's happening?
  2. Croydon

    Croydon ISPConfig Developer ISPConfig Developer

    Have you checked if your server suffers from high io?
    Install iotop and check usage there.
  3. mattltm

    mattltm Member

    Yes, I left iotop running all day and noticed nothing unusual and no sustained high loads.
  4. sjau

    sjau Local Meanie Moderator

    what Imap Server? Dovecot?
  5. mattltm

    mattltm Member

    Yes, Dovecot...
  6. till

    till Super Moderator Staff Member ISPConfig Developer

    You should consider to install munin, it shows graphically many server parameters and might help to identify the source of your issue.
  7. mattltm

    mattltm Member


    Lets see what it throws up...
  8. mattltm

    mattltm Member

    Nothing unusual in iotop, nothing strange in munin but still very slow right now :(

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