Re: Mirror Mode, MMR and replicas

--On Wednesday, March 18, 2009 3:01 AM -0700 Howard Chu<hyc(a)symas.com> wrote: > Quanah Gibson-Mount wrote: >> A number of our clients have requested "fail-over"/redundancy >> capabilities for the LDAP master, and as I'm currently working on moving >> our product to use OpenLDAP 2.4, this becomes a distinct possibility. >> However, I have some questions about the >> viability/reliability/effectiveness of using multiple masters combined >> with replicas. I don't see these answered in the Admin Guide. > > You mean, setting up regular read-only replicas slaved to the masters? Yes. >> I'll start with replication under MMR. > >> As I understand it, the replicas can only point at a single master. > > False. Last I checked, the provider parameter in the syncrepl configuration block was single valued. Which means either it gets pointed at a load balancer, or it only talks to a single master. If that master goes down, it no longer talks to anything without reconfiguration.