This course mainly introduces big data storage systems. For both structured and unstructured data, this course illustrates them in storage and database tracks, respectively. Particularly, tranditional big data storage systems are introduced in this course, such as hadoop (HDFS,HBase), Google GFS/Chubby/BigTable, Amazon S3, Microsoft Azure Storage, Ali Cloud, etc. Critical issues like data reliability, data consistency, metadata management are well illustrated in this course. The course aims to help students to understand how file systems/databases really work for big data storage.