Severalnines Blog
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Scaling Drupal on Multiple Servers with Galera Cluster for MySQL

This post shows you how to move from a single instance Drupal/MySQL to a multi-server environment. A well designed multi-server deployment not only allows Drupal to scale, but will also enhance redundancy by removing single points of failure. Components used are Apache, PHP, csync2, lsyncd, Keepalived, HAproxy,&MySQL Galera ClusterClusterControl.

MongoDB Sharding - On-premises Deployment and Monitoring of MongoDB Sharded Clusters

Last year, we did a survey asking our users about any other databases they were using alongside MySQL. A clear majority were interested in using other databases alongside MySQL, these included (in order of popularity) MongoDB, PostgreSQL, Cassandra, Hadoop, Redis.