What if you need to restart a server or it fails?

[tanraya]

Does all 'likes' still keeps? Can we dump all 'likes' to DB?

[bemurphy]

@tanraya that would be a feature of how you have your redis servers configured. Most people use some degree of disk persistance in combination with slaves.

Redis replication: http://redis.io/topics/replication
Redis persistance: http://redis.io/topics/persistence