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Network Attached Storage (NAS) © 2009 EMC Corporation Section 2 : Storage Networking Technologies and Virtualization Network-Attached Storage Chapter 7 EMC Proven Professional The #1 Certification Program in the information storage and management industry © 2009 EMC Corporation. All rights reserved. Chapter Objectives After completing this chapter, you will be able to: o Describe NAS, its benefits and components o Discuss different NAS implementations o Describe NAS file-sharing protocols o Discuss NAS management options © 2009 EMC Corporation. All rights reserved. File Sharing Environment o File system is a structured way of storing and organizing data files o File Sharing o Storing and accessing data files over network o File system must be mounted in order to access files o Traditional client/server model, implemented with file-sharing protocols for remote file sharing o Example: FTP, CIFS (also known as SMB), NFS, DFS © 2009 EMC Corporation. All rights reserved. File Sharing Technology Evolution Networked File Sharing Portable Media Networked PCs Stand Alone PC for File Sharing Network Attached Storage (NAS) © 2009 EMC Corporation. All rights reserved. What is NAS ? NAS is shared storage on a network infrastructure Clients Application Print Server Server NAS Device © 2009 EMC Corporation. All rights reserved. General Purpose Servers vs. NAS Devices Applications File System Print Drivers Operating System File System Network Operating System Network Single Function NAS Device • Dedicated for file-serving • Uses real-time OS dedicated for file- serving purpose General Purpose Servers (Windows or UNIX) © 2009 EMC Corporation. All rights reserved. Benefits of NAS o Support comprehensive access to information o Improves efficiency – uses special purpose OS o Improved flexibility – platform independent o Centralizes storage o Simplifies management o Scalability o High availability – provide redundant components o Provides security integration to environment (user authentication and authorization) © 2009 EMC Corporation. All rights reserved. Components of NAS UNIX NFS Network Interface NAS Head NFS CIFS IP NAS Device OS Storage Interface CIFS Windows Storage Array © 2009 EMC Corporation. All rights reserved. NAS File Sharing Protocols o Two common NAS file sharing protocols are: o NFS – Network File System protocol o Traditional UNIX environment file sharing protocol o CIFS – Common Internet File System protocol o Traditional Microsoft environment file sharing protocol, based upon the Server Message Block protocol © 2009 EMC Corporation. All rights reserved. Network File System (NFS) o Client/server application o Uses RPC mechanisms over TCP protocol o Mount points grant access to remote hierarchical file structures for local file system structures o Access to the mount can be controlled by permissions Additional Task Research on NFS & CIFS © 2009 EMC Corporation. All rights reserved. NAS File Sharing - CIFS o Common Internet File System o Developed by Microsoft in 1996 o An enhanced version of the Server Message Block (SMB) protocol o Stateful Protocol o Can automatically restore connections and reopen files that were open prior to interruption o Operates at the Application/Presentation layer of the OSI model o Most commonly used with Microsoft operating systems, but is platform- independent o CIFS runs over TCP/IP and uses DNS (Domain Naming Service) for name resolution © 2009 EMC Corporation. All rights reserved. NAS I/O 2 Application Storage Interface 3 Operating System Network Protocol Block I/O to storage device I/O Redirect NAS Operating System NFS / CIFS NFS / CIFS Storage Array Client uses file I/O TCP/IP Stack TCP/IP Stack 1 Network Interface Network Interface 4 Client IP Network NAS Device © 2009 EMC Corporation. All rights reserved. NAS Implementations Integrated NAS IP NAS Device Gateway NAS IP FC SAN NAS Head Storage Array © 2009 EMC Corporation. All rights reserved. Integrated NAS Connectivity Clients Application Server IP Integrated NAS System Application Server © 2009 EMC Corporation. All rights reserved. Gateway NAS Connectivity Additional Task Research on suitable environments for implementing Integrated & Gateway NAS Application Server Client IP FC SAN Client Application Server Storage Array Client NAS Gateway © 2009 EMC Corporation. All rights reserved. Hosting and Accessing Files on the NAS Steps to host a file system: o Create an array volume o Assign volume to NAS device o Create a file system on the volume o Mount the file system o Access the file system o Use NFS in UNIX environment o Execute mount/nfsmount command o Use CIFS in windows environment o Map the network drive as: \\Account1\Act_Rep © 2009 EMC Corporation. All rights reserved. NAS Management o Most ship with vendor management software o Have unique management issues o Require preliminary analysis o Need additional complementary software © 2009 EMC Corporation. All rights reserved. Managing NAS Environments o Managing an Integrated System o Both NAS component and the storage array are managed via NAS management software o Managing a Gateway System o NAS component managed via NAS management software o Storage array managed via array management software © 2009 EMC Corporation. All rights reserved. Traditional File Server Environment – Example 1 Internal Users Business Clients Surfers, Shoppers IP Web Database Transaction Mission Windows Critical UNIX File File Server Servers Server FC SAN © 2009 EMC Corporation. All rights reserved. Storage Consolidation with NAS Internal Users Business Clients Surfers, Shoppers LAN/WAN Database NAS Transaction Head Mission Critical Servers FC SAN © 2009 EMC Corporation. All rights reserved. Traditional File Server Environment – Example 2 UNIX NT W2K IP UNIX Windows General purpose OS serving files via FTP, CIFS, NFS, HTTP. © 2009 EMC Corporation. All rights reserved. Server Consolidation with NAS NAS IP UNIX Windows General purpose OS serving files via FTP, CIFS, NFS, HTTP. © 2009 EMC Corporation. All rights reserved. Chapter Summary o Key topics covered in this chapter: o NAS Benefits o NAS Components o NAS File Sharing Protocols o CIFS and NFS o NAS Implementation o Integrated NAS o Gateway NAS o Hosting and Accessing File on NAS o NAS Management o NAS Examples Additional Task Research on factors affecting NAS Performance, Virtual LUN & Jumbo Frames © 2009 EMC Corporation. All rights reserved. Check your Knowledge o What is the difference between an Integrated and Gateway NAS solution? o Which NAS type would you deploy if you already have a SAN and storage array? o Which NAS type is the simplest to deploy? o Which file serving environments typically uses CIFS and NFS? © 2009 EMC Corporation. All rights reserved. #1 IT company For more information visit http://education.EMC.com © 2009 EMC Corporation. All rights reserved. .
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