Scalability 101 and dropbox

Scalability from Harvard :

https://www.youtube.com/watch?v=-W9F__D3oY4

Notes:
1. scalability 101.
2. issues when having multiple servers, share data, etc.


Scale dropbox:

https://www.youtube.com/watch?v=PE4gwstWhmc

Notes:
1. heavy write V.S heavy read
2. no need to internet scale at beginning.