How can high-availability be achieved with the Virtual Directory Server?
In a high availability environment, a first level of failover and load balancing can be established by replicating the same logical image of the VDS across two (or more) servers. A set of hardware load balancers (Cisco, F5) can distribute the load or fail over to a set of redundant VDS server configurations. Each VDS configuration itself can represent a very complex directory tree with potentially many branches and nodes coming from many different data sources with different latencies. The query load can be very high on some specific part of the tree (authentication hot spots for example) and the underlying data sources could have high latencies. Different strategies can be adapted to provide a high level of availability. Two mechanisms can be leveraged to maximize throughput: smart routing and caching. Smart Routing: Leveraging the Virtual DIT and RadiantOne LDAP Access Router One of the strengths of a virtual directory resides in its ability to manipulate the namespace.
In a high availability environment, a first level of failover and load balancing can be established by replicating the same logical image of the VDS across two (or more) servers. A set of hardware load balancers (Cisco, F5) can distribute the load or fail over to a set of redundant VDS server configurations. Each VDS configuration itself can represent a very complex directory tree with potentially many branches and nodes coming from many different data sources with different latencies. The query load can be very high on some specific part of the tree (authentication hot spots for example) and the underlying data sources could have high latencies. Different strategies can be adapted to provide a high level of availability. Two mechanisms can be leveraged to maximize throughput: smart routing and caching. Smart Routing: Leveraging the Virtual DIT and RadiantOne LDAP Access Router One of the strengths of a virtual directory resides in its ability to manipulate the namespace. Dividing an e
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