Archive for the ‘HA’ Category

Best available technologies overview First of all, we will discuss how to loadbalance queries from application to our MySQL database cluster. It is nice to have a database cluster that provides high availability and performance, but if you don’t find a proper way to connect, your efforts will be useless. Different approaches exist to loadbalance […]

Tuesday, March 17th, 2009 at 21:08 | 6 comments
Categories: HA

In this scenario, we have two machines and try to make the most of available resources. Each of the node will play the role of realserver, it will provide a service such as a web or a mail server. At the same time, one of the machines will loadbalance the requests to itself and to […]

Monday, January 26th, 2009 at 17:53 | 75 comments
Categories: HA

This article should be seen as a continuation of the post entitled DRBD8 with two primaries on debian etch. We noticed that DRBD8 with two primaries could not only ensure filesystem integrity but also does not work as expected under Ext3 filesystem. It focuses only on synchronization. As shown in following figure, read accesses take […]

Wednesday, January 14th, 2009 at 19:15 | 25 comments
Categories: HA

The goal of this post is to set up an architecture composed of two nodes that can both simultaneously have read/write access to a synchronized partition. Each node will access the synchronized partition as any other classical partition, the only difference is that every modification will also be forwarded to the other node. DRBD8 configuration […]

Wednesday, December 10th, 2008 at 09:10 | 10 comments
Categories: HA