Re: High availability mail server options

From: Les Mikesell (lesmikesell_at_gmail.com)
Date: 10/04/05

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Date: Tue, 04 Oct 2005 16:29:45 -0500

    On Tue, 2005-10-04 at 15:30, David Hollis wrote:
    > >
    > > > 2. A Maildir setup would likely put each users folders in their home
    > > > directories making it extremely difficult to backup the mail itself
    > > > whereas something like cyrus-imapd has it's own mail store which can be
    > > > put onto it's own partition and could simply be dumped.
    > >
    > > If you are going to the trouble of providing redundancy, I'd think
    > > you'd want to back up all of the user's data, not just email, so
    > > having it all in the same place becomes an advantage for maildirs.
    > > Also, the cyrus database format may have some internal dependencies
    > > that will break if you copy it without shutting down. The maildir
    > > format was designed so the messages were self-contained and do
    > > not need multiple operations to be atomic. Dovecot tries to keep
    > > an index which will most likely be wrong if copied when the user
    > > is active, but it will rebuild it if it becomes inconsistent.
    > >
    >
    > Yeah, the dovecot index stuff I'm hoping really isn't an issue.
    > Hopefully it picks up that things it's out-of-whack and updates itself.
    > As for user data, there isn't any on this system, it's just mail so I
    > only need to replicate the mail partition contents and the LDAP
    > directory part. LDAP will use OpenLDAPs replication of course so that
    > part isn't an issue.

    If you really need down-to-the second replication you might look at
    the raid-over-network options - drbd or raid over enbd devices. But
    a 'warm' backup server kept up to date with frequent rsyncs is
    going to be a lot better than most other ways you would handle
    backup/restore and server crashes. 

    -- 
  Les Mikesell
    lesmikesell@gmail.com
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