Agree with GP that this is getting pretty far off the article, but also--I think remote caches in datacenters are sometimes as much about making the cache share

Agree with GP that this is getting pretty far off the article, but also--I think remote caches in datacenters are sometimes as much about making the cache shared as about the storage latency. If you have a lot of boxes running your application, sometimes it's nice to be able to do an expensive thing once per expiry period across the cluster, not once per expiry per app server. Or sometimes you want a cheap simple way to invalidate or write a new value for the full cluster. The throughput and latency of SSDs does make them a workable cache medium for some uses, with much lower cost/GB than RAM, but that can be independent of the local/remote choice.