Cyrus 2.3 on shared filesystems

[Ken Murchison]

Attila Nagy wrote:

> Ken Murchison wrote:
> 
>>> Is replicated murder consists of multiple backend server groups which 
>>> has the same mailboxes? So murder will say that user.jsmith is on 
>>> server1 AND server2, instead of just saying it's on server1 OR server2?
>>
>> Yes.  Any machine in the Murder has local access to any mailbox.
> 
> Hmm. If any machine can access any of the mailboxes, why is murder 
> necessary?

The MUPDATE protocol is used to keep mailboxes.db in sync on each server.


> Above, I described a setup, similar to this (ASCII art follows):
> 
> +-----+ +-----+  +-----+ +-----+
> |IMAP1| |IMAP2|  |IMAP3| |IMAP4|
> +--+--+ +-----+  +--+--+ +-----+
>    |   /            |   /
> +--+--+          +--+--+
> |STOR1|          |STOR2|
> +-----+          +-----+
> 
> So murder is necessary to make the namespace unified. This way the 
> MUPDATE servers say that a mailbox on STOR1 storage is on IMAP1 and 
> IMAP2, so IMAP3 can't access mailboxes on STOR1. Does this work?

No.  You're talking about two levels of synchronization here, the 
current Murder code only handles the following scenarios.


Standard/Unified Murder:

+-----+ +-----+ +-----+ +-----+
|IMAP1| |IMAP2| |IMAP3| |IMAP4|
+--+--+ +--+--+ +--+--+ +--+--+
    |       |       |       |
+--+--+ +--+--+ +--+--+ +--+--+
|STOR1| |STOR2| |STOR3| |STOR4|
+-----+ +-----+ +-----+ +-----+

In a standard config, the mailboxes.db on each IMAP server only contains 
those mailboxes contained on its local STORage.  The master mailboxes.db 
(which contains ALL mailboxes and the servers on which they reside) is 
located on the MUPDATE master and slaves (frontend).

In a unified config, the master mailboxes.db is located on the MUPDATE 
master.  Each IMAP server is an MUPDATE slave (no frontends necessary) 
and differentiates between local and remote mailboxes.


Replicated Murder:

+-----+ +-----+ +-----+ +-----+
|IMAP1| |IMAP2| |IMAP3| |IMAP4|
+-----+ +--+--+ +--+--+ +--+--+
        \    \      /   /
         \   +-----+   /
          \--+STOR1+--/
             +-----+

In a replicated config, the master mailboxes.db is located on the 
MUPDATE master.  Each IMAP server is an MUPDATE slave (no frontends 
necessary) and all mailboxes are considered local.

-- 
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
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