is amazon elasti cache / redis always inmemory, or does it page stuff lke dbs ?

@qqq that's an incredibly vague question about serialisation, you'll need to give more context

Pretty sure elasticache is memory only by default. http://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/RedisAOF.html

@danielcompton: I called up aws business support; they agree with you -- elastic cache is in memory only so far