Estimate servers architecture (hits, traffic,droplets size)
I was just wondering how can I correctly estimate my servers needs.
I have a website done with PHP and MySQL ( replaceble with mariaDB ).
Each page is on average around 300-400Kb
I have 3 user types:
1) Simple user
- will visit 6 pages
- will spend 2-5 minutes
2) Average user
- will visit 10-15 pages
- will spend 5-12minutes
3) Heavy user
- will visit 15-30 pages
- will spend 12-25minutes
In our beta-testing period we estimate to have around 200 users the first 2weeks and around 1000users in the first 2 months, most of them coming from USA (same timezone).
The question is:
A) how can I start ?
B) how can I scale ?
This is my idea, please comment:
A) DB srv => 1Mb droplet (if needed I can scale to 2Mb droplet)
Automatic daily DB backup on other FTP server.
webserver => 512Mb droplet (if needed I can scale to 1Mb droplet)
How much traffic will this setup handles ?
My BADGET: $30/mo
DB srv => 2Mb droplet
Automatic DB backup every day, live replica on a smaller droplet?
LoadBalancer => 512Mb droplet
web1 => 512Mb droplet
web2 => 512Mb droplet
web3 => 512Mb droplet
My BADGET: $50/mo
Will this architecture handle 10.000 users? what about 20.000 ?
My concern is about the DB srv, is that enought? should I go on a dedicated machine (master) with a slave on a 1Mb/2Mb droplet ? Should I keep everything whitin DO infrastraction?