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A. Single Dedicated Server
Single dedicated server solutions are a good starting point for projects that used to be hosted on shared hosting or VPS accounts that have outgrown the capacity of those solutions. Dedicated servers provide more power and dedicated system resources to support further growth.
B. Web & DB Dedicated Servers
As a site grows beyond the capacity of a single dedicated server solution, the next logical step for better performance and security is separating the web applications and databases onto different dedicated servers specific to those tasks. Having a separate dedicated server responsible for web and database requests greatly improves the performance for each task. Each dedicated server can be optimized to carry out its duties. A firewall is the first and biggest step in securing your site. From this dedicated server you can grow into the Example Scalable Solution or Database HA Solution below.

Setting up a database cluster provides you with redundancy on the database level so that if you sustain a failure on one of your dedicated servers, the other database server can continue functioning and serving data. Database clustering is handled differently in a Windows/MS SQL environment versus a Linux/MySQL environment and our sample depicts a Microsoft SQL Cluster utilizing a shared storage array. The addition of a dedicated backup server makes it possible to easily archive backups for each layer of your infrastructure. This solution allows you to have HA on both the Web and Database layers, and allows for growth into the Enterprise HA Solution below.

Redundant firewalls and load balancers add high availability to your network device layer, meaning that any single device can be removed from this configuration and your site will remain online. With a firmly-established application layer, every component of your infrastructure is scalable, so as the demand on your site increases, you can target upgrades and additional dedicated servers directly to the areas that are causing a bottleneck.
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