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Network-Attached Storage

Network-Attached Storage. Module 2.3. Module Objectives. After completing this module, you will be able to: Describe NAS, its benefits and components Discuss different NAS implementations Describe NAS file-sharing protocols Discuss NAS management options. File Sharing Environment.

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Network-Attached Storage

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  1. Network-Attached Storage Module 2.3

  2. Module Objectives After completing this module, you will be able to: • Describe NAS, its benefits and components • Discuss different NAS implementations • Describe NAS file-sharing protocols • Discuss NAS management options Network-Attached Storage

  3. File Sharing Environment • File system is structured way of storing and organizing data files • File Sharing • Storing and accessing data files over network • FS must be mounted in order to access files • Traditional client/server model, implemented with file-sharing protocols for remote file sharing • Example: FTP, DNS • DFS is another examples of file sharing implementation Network-Attached Storage

  4. File Sharing Technology Evolution Networked File Sharing Networked PCs Portable Mediafor File Sharing Stand Alone PC Network Attached Storage (NAS) Network-Attached Storage

  5. What is NAS ? NAS is shared storage on a network infrastructure Clients ApplicationServer PrintServer NAS Device Network-Attached Storage

  6. Single Function NAS Device General Purpose Servers vs. NAS Devices File System Applications Operating System Print Drivers Network File System Operating System Network General Purpose Servers (Windows or UNIX) Network-Attached Storage

  7. Benefits of NAS • Support comprehensive access to information • Improves efficiency • Improved flexibility • Centralizes storage • Simplifies management • Scalability • High availability – through native clustering • Provides security integration to environment (user authentication and authorization) Network-Attached Storage

  8. Components of NAS NFS Network Interface UNIX NAS Head NFS CIFS IP NAS Device OS Storage Interface CIFS Windows Storage Array Network-Attached Storage

  9. NAS File Sharing Protocols • Two common NAS file sharing protocols are: • CIFS – Common Internet File System protocol • Traditional Microsoft environment file sharing protocol, based upon the Server Message Block protocol • NFS – Network File System protocol • Traditional UNIX environment file sharing protocol Network-Attached Storage

  10. Network File System (NFS) • Client/server application • Uses RPC mechanisms over TCP protocol • Mount points grant access to remote hierarchical file structures for local file system structures • Access to the mount can be controlled by permissions Network-Attached Storage

  11. NAS File Sharing - CIFS • Common Internet File System • Developed by Microsoft in 1996 • An enhanced version of the Server Message Block (SMB) protocol • Stateful Protocol • Can automatically restore connections and reopen files that were open prior to interruption • Operates at the Application/Presentation layer of the OSI model • Most commonly used with Microsoft operating systems, but is platform-independent • CIFS runs over TCP/IP and uses DNS (Domain Naming Service) for name resolution Network-Attached Storage

  12. 2 3 1 4 Client IP Network NAS Device NAS I/O Application Storage Interface Operating System Network Protocol Block I/O to storage device I/O Redirect NAS Operating System NFS / CIFS NFS / CIFS Storage Array TCP/IP Stack TCP/IP Stack Network Interface Network Interface Network-Attached Storage

  13. IP IP FC SAN NAS Implementations Integrated NAS NAS Device NAS Gateway NAS Head Storage Array Network-Attached Storage

  14. IP Integrated NAS Connectivity Clients UNIX Server Integrated NAS System Windows Server Network-Attached Storage

  15. Client Client Client IP FC SAN Gateway NAS Connectivity Application Server Application Server Storage Array NAS Gateway Network-Attached Storage

  16. Hosting and Accessing Files on the NAS Steps to host a file system: • Create an array volume • Assign volume to NAS device • Create a file system on the volume • Mount the file system • Access the file system • Use NFS in UNIX environment • Execute mount/nfsmount command • Use CIFS in windows environment • Map the network drive as: \\Account1\Act_Rep Network-Attached Storage

  17. NAS Management • Most ship with vendor management software • Have unique management issues • Require preliminary analysis • Need additional complementary software Network-Attached Storage

  18. Managing NAS Environments • Managing an Integrated System • Both NAS component and the storage array are managed via NAS management software • Managing a Gateway System • NAS component managed via NAS management software • Storage array managed via array management software Network-Attached Storage

  19. IP FC SAN Traditional File Server Environment – Example 1 Internal Users Business Clients Surfers, Shoppers Web Database Transaction Mission Critical Servers Windows File Server UNIX File Server Network-Attached Storage

  20. Business Clients LAN/WAN FC SAN Storage Consolidation with NAS Internal Users Surfers, Shoppers Database Transaction Mission Critical Servers NAS Head Network-Attached Storage

  21. IP Traditional File Server Environment – Example 2 UNIX NTW2K UNIX Windows General purpose OS serving files viaFTP, CIFS, NFS, HTTP. . . Network-Attached Storage

  22. IP Server Consolidation with NAS NAS UNIX Windows General purpose OS serving files viaFTP, CIFS, NFS, HTTP. . . Network-Attached Storage

  23. Module Summary • Key topics covered in this module: • NAS Benefits • NAS Components • NAS File Sharing Protocols • CIFS and NFS • NAS Implementation • Integrated NAS • Gateway NAS • Hosting and Accessing File on NAS • NAS Management • NAS Examples Network-Attached Storage

  24. Concept in Practice – EMC Celerra • Celerra is a • Dedicated and high-performance infrastructure for file level I/Os • Consists of • Data Movers • Control Station • Specialized O/S (DART) EMC Celerra NS40G (Gateway NAS) EMC Celerra NS-960 Integrated NAS Network-Attached Storage

  25. Joining the Building Blocks - Integrated Data Mover IP Network Internal Network Switch Control Station Serial cable connect Internal network connect Fibre Channel storage connect Network-Attached Storage

  26. Joining the Building Blocks - Gateway Data Mover Fibre Channel Switch NAS NAS NAS NAS NAS NAS IP Network Internal Network Switch SAN SAN SAN SAN SAN SAN Control Station SAN Host(s) Serial cable connect Internal network connect Fibre Channel storage connect Network-Attached Storage

  27. Check your Knowledge • What is the difference between an Integrated and Gateway NAS solution? • Which NAS type would you deploy if you already have a SAN and storage array? • Which NAS type is the simplest to deploy? • Which file serving environments typically uses CIFS and NFS? Network-Attached Storage

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