Defining a Replication Strategy134 Red Hat Directory Server Deployment Guide • May 2005• Use the hub supplier to replicate to local sites throughout the enterprise.Replicating to local sites helps balance the workload of your servers and yourWANs, as well as ensuring high availability of directory data. Assume thatyou want to replicate to four sites around the country. You then have fourconsumers of each hub supplier.• At each site, replicate at least once to ensure high availability, at least for readoperations.Use DNS sort to ensure that local users always find a local Directory Serverthey can use for directory lookups.Example Replication Strategy for a Small SiteSuppose your entire enterprise is contained within a single building. Thisbuilding has a very fast (100 MB per second) and lightly used network. Thenetwork is very stable, and you are reasonably confident of the reliability of yourserver hardware and OS platforms. Also, you are sure that a single server’sperformance will easily handle your site’s load.In this case, you should replicate at least once to ensure availability in the eventyour primary server is shut down for maintenance or hardware upgrades. Also,set up a DNS round-robin to improve LDAP connection performance in the eventthat one of your Directory Servers becomes unavailable.Example Replication Strategy for a Large SiteSuppose your entire enterprise is contained within two buildings. Each buildinghas a very fast (100 MB per second) and lightly used network. The network is verystable and you are reasonably confident of the reliability of your server hardwareand OS platforms. Also, you are sure that a single server’s performance will easilyhandle the load placed on a server within each building.Also assume that you have slow (ISDN) connections between the buildings, andthat this connection is very busy during normal business hours.
