Re: Playing with replicated murder

From: Ken Murchison (no email)
Date: Fri Mar 04 2005 - 10:00:44 EST

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    Christoph Moench-Tegeder wrote:

    > ## Ken Murchison ():
    >
    >
    >>>I am a little confused over the location of configdirectory, some of its
    >>>contents (like the DB environment, the socket und the proc directorys)
    >>>should be kept per node (I believe), while others (as quota files)
    >>>should be shared between nodes. What about the replicated mailboxes.db?
    >>>What am I missing?
    >>
    >>I'm assuming that your talking about the current code in 2.3 which uses
    >>MUPDATE to replicate mailboxes.db across multiple backends sharing the
    >>same spool.
    >
    >
    > Yes, I forgot to mention that. Currently I'm using code from CVS as
    > of 2005-02-14.
    >
    >
    >>mailboxes.db is local to each machine, as are deliver.db and tls_sessions.db
    >>The user's seen state and subscriptions, as well as quotaroots can be
    >>shared on the SAN.
    >>So basically /var/imap is local, but /var/imap/user, /var/imap/quota,
    >>/var/spool/imap are on the SAN.
    >
    >
    > Are symlinks "the right way" to do that or did I miss something in
    > imapd.conf.5?

    symlinks are fine.

    >>Note that the university that I wrote the code for has abandoned it
    >>because of problems with Sun's SAN filesystem.
    >
    >
    > Hm. Polyserve claims their filesystem "exhibits the same behavior
    > as an ext3 file system", but that's marketing... We will see.
    > That's what tests are for :) In any case, I will report here.
    >
    > Is there anything special I should be aware of?

    Not that comes to mind at the moment. Let me know if you have questions.

    -- 
    Kenneth Murchison     Oceana Matrix Ltd.
    Software Engineer     21 Princeton Place
    716-662-8973 x26      Orchard Park, NY 14127
    --PGP Public Key--    http://www.oceana.com/~ken/ksm.pgp
    ---
    Cyrus Home Page: http://asg.web.cmu.edu/cyrus
    Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu
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