Load Balacing

Software Engineering for Internet Applications

Small: One multi-CPU machine for RDBMS, multiple single-CPU machines running webservers.
Session ID needs to be in RDBMS.
Load balancing could be done by DNS in round-robin fashion. But this might be bad when you give all of aol.com the same IP.
A load balancing router (free) routes requests as per network load. Only one IP needed.
Statics (pictures, javascript libs, css) can be off-loaded: akamai
Remember: memory is getting cheap and large.