How can I achieve high available solution for directory server
You can start with deploying multi master replication which will give you 2 servers available for writes (and as many read-only consumers as you want).
You can also install Directory Server in a Cluster (using Sun Cluster) which will provide more failover capabilities.
If you combine both, you should be able to have almost no downtime.
You can also use the Directory Proxy Server (aka iDAR) to provide transparent failover for client applications.
I hope this help.
Regards,
Ludovic.
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