Plantescale (a database company) released an article about sharding.

It doesn't go into deep technical details. Also, it's a pity that they did not touch on some operational aspects of sharded storages: how to back up those systems, replication, etc. On another hand, because of this the article is brief and easy to follow.

It may be useful for your system design interviews out there, because it is high level and it mentions some existing out-of-the-box solutions.

P.S. It also has some very nice animations!

#databases