What are my options for clustering (load balancing, failover, etc.)?
The OpenSRF framework is inherently cluster-friendly, allowing the ad-hoc addition of inexpensive commodity hardware when system load dictates. The PINES implementation currently uses approximately 25 servers in production, and machines are added and removed on a regular basis as needed. Evergreen uses PostgreSQL, the most advanced and robust Open Source RDBMS available, as its back-end data store. In order to provide load balancing for the Evergreen database, PINES has implemented Slony-I with PGPool as a clustering solution. Other clustering solutions exist for PostgreSQL, and may make sense in other environments. In order to provide load balancing and high-availability at the OPAC and Staff Client level, PINES has implemented a Linux Virtual Server environment with five independent mini-clusters. This allows live updates of the entire system with no perceived downtime or interruption in service.
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- What are my options for clustering (load balancing, failover, etc.)?
