[Fedora-directory-users] multi-master limit

[Rich Megginson]

Jason Beavers wrote:
> Good to hear.  The actual directory will likely be small in size 
> (number of objects).
Also important to keep in mind is your update rate - avg. updates per 
minute, max. updates per minute.
> 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?
In Fedora DS, replication is supplier initiated, and will update as soon 
as possible by default.  That is, as soon as the supplier receives the 
change, it will send it to the consumer.  There are also programmatic 
ways to do it, but you usually don't need to.
>
> thanks,
>
> Jason
>
> ----- Original Message ----
> From: Rich Megginson <rmeggins at redhat.com>
> To: General discussion list for the Fedora Directory server project. 
> <fedora-directory-users at 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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