High availability

I am building this portal, that needs high availability and I am
thinking about clustering the 3 linux boxes to be one so if one box
goes down the other two will still keep the site up. Also I want to be
able to grow more boxes. I was also thinking too, that i will need
another server just for the db that will be running mysql.

So I guess the picture will be like 3 clustered webserver and 1or2
clustered mysql db server...

does this sound good or does anyone see any holes in this?

.

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