1 INTRODUCTION  
1.1 Motivation  
1.2 Organization  

2 BIG DATA STORAGE SYSTEM  
2.1 Hadoop Distributed File System  
2.2 Classification of Storage System Architecture  
2.3 Types of Big Data Storage  
2.4 Database  
2.5 Query Systems  

3 METADATA  
3.1 Metadata Schema  
3.2 Types of Metadata  
3.3 Metadata Operations  

4 METADATA SERVERS  
4.1 Categories of Metadata Servers  
4.2 Data Server  

5 METHODS USED IN DESIGNING MDS  

6 MDS DESIGNS  

7 ISSUES IN MDS DESIGN  

8 DISCUSSION  

9 CONCLUSION