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Re: High Availability / Clustering

Not sure what to say about high availability on the masters, but you can front
end your slaves with any hardware/software load balancer and get your fail over
to work. We use Foundry Serverirons and they work just fine.

- gary

> From: Lee <lee_hoffman@brown.edu>
> Date: Thu, 10 Apr 2003 17:47:17 -0400
> Subject: High Availability / Clustering
> To: openldap-software@OpenLDAP.org
> Comment: openldap-software mailing list <http://www.OpenLDAP.org/lists/>
> Ive read through most of the archives concerning high-availability 
> options for openldap. Right now, we're trying to create make our ldap 
> infrastructure highly-available, as well as load-balanced between three 
> servers (more to be added later). From my research it seems like we 
> have a few options:
> 1) Experimental Multi-Master: This seems to have a number of atomicity 
> issues. Plus this doesn't really solve the problem with the ldap 
> clients not appropriately using the second listed server if the first 
> goes down.
> 2) Plain old Master + Multiple Slaves: Same second issue above, plus no 
> high availability on writes.
> 3) Master + Slaves, Promotion of Slave if master goes down: Same ldap 
> client not using second listed server problem as in 1) and 2) above, 
> plus lots of issues with reclaiming Master status after failure.
> 4) 1 Master Server Cluster using shared storage: This seems like the 
> only viable solutions. The problem is we need support for many servers 
> connecting to one shared storage device, as well some sort of reliable 
> locking mechanism thats compatible with openldap.
> Has anyone successfully implemented 4) ? If so can you recommend any 
> specific hardware and or software that works nicely with openldap?
> Thanks,
> L