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@@ -28,7 +28,7 @@ Must read papers on distributed systems. While nearly *all* of Lamport's work sh
 - [Bigtable: A Distributed Storage System for Structured Data](http://static.googleusercontent.com/media/research.google.com/en//archive/bigtable-osdi06.pdf)
 - [The Google File System](http://static.googleusercontent.com/external_content/untrusted_dlcp/research.google.com/en/us/archive/gfs-sosp2003.pdf)
 - [Cassandra: A Decentralized Structured Storage System](http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.161.6751&rep=rep1&type=pdf) Inspired heavily by Dynamo
-- [CRUSH: Controlled, Scalable, Decentralized Placement of Replicated Data](http://www.ssrc.ucsc.edu/Papers/weil-sc06.pdf), Basis of Ceph distributed storage system
+- [CRUSH: Controlled, Scalable, Decentralized Placement of Replicated Data](http://www.ssrc.ucsc.edu/Papers/weil-sc06.pdf), the algorithm for the basis of Ceph distributed storage system, for the architecture itself read [RADOS](http://ceph.com/papers/weil-rados-pdsw07.pdf)
 
 ### Messaging systems
 - [The Log: What every software engineer should know about real-time data's unifying abstraction](http://engineering.linkedin.com/distributed-systems/log-what-every-software-engineer-should-know-about-real-time-datas-unifying), a somewhat long read, but covers brilliantly on logs, which are at the heart of most distributed systems