SCALING
Twice the server.
Twice the outage.
ONE MACHINE, ONE PLUG
Traffic outgrew one machine. There
are only two ways to answer that.
VERTICAL
SCALE UP
It is the simple answer, but one machine has a top and one plug.
HORIZONTAL
SCALE OUT
Capacity adds up now, and losing one node is not losing the service.
VERTICAL — scale up. One machine,
a hard ceiling, one plug.
HORIZONTAL — scale out. More
machines, and one can fail.
Twice the server.
Twice the outage.
You'll want this one
in the design round.
