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Re: [Fedora-directory-users] multi-master limit

Good to hear.  The actual directory will likely be small in size (number of objects).
So it sounds like as long as we manage the number of agreements (2-3) per node then we may be okay.

Another quick question, I assume there is a programatic call that can be made to trigger replication push for a supplier.  True?



----- Original Message ----
From: Rich Megginson <rmeggins redhat com>
To: General discussion list for the Fedora Directory server project. <fedora-directory-users redhat com>
Sent: Tuesday, December 4, 2007 9:12:19 AM
Subject: Re: [Fedora-directory-users] multi-master limit

Jason Beavers wrote:
> Hi all,
> New to FedoraDS.  I'm doing some research for an upcoming application
> that will require LDAP.
> This App will consist of multiple servers (10 or more) in different
> geographical locations.
> Each server will authenticate against itself and serve its own local
> data.
> The full LDAP directory needs to be replicated across all servers so
> that users can login to any server.
> I've read that there is a limit of 4 writable servers in multi-master
> replication.  Is this a hard limit or a soft (reccomendation) limit?
That means 4 is the highest number of masters we've tested
exhaustively.  The protocol supports up to 2^32-2 masters, but you will
usually hit a practical limit in the number of replication agreements.  
Each repl. agreement runs a separate thread, so you will usually be
constrained by resources - available RAM, processors, etc.
> The application will need to write changes directly to itself on all
> servers
The application will write the changes directly to each of the 10 masters?
> so that they are immediately available locally, then replicated to
> other servers.
> Is this possible with FedoraDS?
Yes, it is possible.
> Thanks in advance!
> Beavrz1
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