Simple failover schema for 4 servers

Here is simple failover schema for 4 servers with 2 active web nodes and frontend/backend architecture, MySQL replication, NFS and DRBD active-passive mode.

http://my.itwnik.com/wp-content/uploads/2012/04/Simple-Failover-Schema-4S1.png

I must admit that this architecture build on compromise of availability and performance. If you’d like to have better performance please avoid shared data. For example: use can use CDN for static content or shared storage device etc …

Also that’s good idea to have cache level on this schema. For example you can use memcache as a session storage and cache data.

Author: GergunD

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