[LoSboccacc]

is there any transnational storage solution that actually handles well a traffic spike?

my understanding is that most storage solution scales well when planned, but scaling during a spike only causes more stress onto the current replicas/partitions for all the time needed to boot and shift data toward new replica/partitions, and the new instances don't contribute in moving the load until the process is complete.

so they work if you can predict a spike, but they can't handle a sudden spike, especially if the data to replicate/partition is sizeable.