yes , as I mentioned cluster is a group of commuters so you can use two webserver and one database server. It's all up to depend on what type of architecture you need,each node contain his own a databases.
following are the main reasons to implement clustering association with databases.
* performance, because you can spread process loads across multiple nodes; *you can expect to get reasonable performance across a bigger system
* high availability, more particularly, continuous availability.
Please let me know if you have more doubts.
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