© 2009 EMC Corporation. All rights reserved. EMC Proven Professional The #1 Certification Program in the information storage and management industry Network-Attached Storage Chapter 7 Section 2 : Storage Networking Technologies and Virtualization

© 2009 EMC Corporation. All rights reserved. Chapter Objectives After completing this chapter, you will be able to: oDescribe NAS, its benefits and components oDiscuss different NAS implementations oDescribe NAS file-sharing protocols oDiscuss NAS management options

© 2009 EMC Corporation. All rights reserved. File Sharing Environment oFile system is a structured way of storing and organizing data files oFile Sharing oStoring and accessing data files over network oFile system must be mounted in order to access files oTraditional client/server model, implemented with file-sharing protocols for remote file sharing oExample: FTP, CIFS (also known as SMB), NFS, DFS

© 2009 EMC Corporation. All rights reserved. File Sharing Technology Evolution Network Attached Storage (NAS) Stand Alone PC Networked File Sharing Networked PCs Portable Media for File Sharing

© 2009 EMC Corporation. All rights reserved. What is NAS ? NAS is shared storage on a network infrastructure Clients Application Server Print Server NAS Device

© 2009 EMC Corporation. All rights reserved. General Purpose Servers vs. NAS Devices Applications Print Drivers File System Operating System Network File System Operating System Network Single Function NAS Device General Purpose Servers (Windows or UNIX) Dedicated for file-serving Uses real-time OS dedicated for file- serving purpose

© 2009 EMC Corporation. All rights reserved. Benefits of NAS oSupport comprehensive access to information oImproves efficiency – uses special purpose OS oImproved flexibility – platform independent oCentralizes storage oSimplifies management oScalability oHigh availability – provide redundant components oProvides security integration to environment (user authentication and authorization)

© 2009 EMC Corporation. All rights reserved. Components of NAS Network Interface NFSCIFS NAS Device OS Storage Interface NAS Head NFS CIFS UNIX Windows Storage Array IP

© 2009 EMC Corporation. All rights reserved. NAS File Sharing Protocols oTwo common NAS file sharing protocols are: oNFS – Network File System protocol oTraditional UNIX environment file sharing protocol oCIFS – Common Internet File System protocol oTraditional Microsoft environment file sharing protocol, based upon the Server Message Block protocol

© 2009 EMC Corporation. All rights reserved. Network File System (NFS) oClient/server application oUses RPC mechanisms over TCP protocol oMount points grant access to remote hierarchical file structures for local file system structures oAccess to the mount can be controlled by permissions Additional Task Research on NFS & CIFS

© 2009 EMC Corporation. All rights reserved. NAS File Sharing - CIFS oCommon Internet File System oDeveloped by Microsoft in 1996 oAn enhanced version of the Server Message Block (SMB) protocol oStateful Protocol oCan automatically restore connections and reopen files that were open prior to interruption oOperates at the Application/Presentation layer of the OSI model oMost commonly used with Microsoft operating systems, but is platform- independent oCIFS runs over TCP/IP and uses DNS (Domain Naming Service) for name resolution

© 2009 EMC Corporation. All rights reserved. Storage Interface Network Protocol NAS Operating System NFS / CIFS TCP/IP Stack Network Interface Application Operating System I/O Redirect NFS / CIFS TCP/IP Stack Network Interface 1324 Block I/O to storage device Storage Array NAS I/O Client uses file I/O

© 2009 EMC Corporation. All rights reserved. NAS Implementations Integrated NAS IP NAS Device Gateway NAS NAS Head IP FC SAN Storage Array

© 2009 EMC Corporation. All rights reserved. Integrated NAS Connectivity Application Server Integrated NAS System Clients IP

© 2009 EMC Corporation. All rights reserved. Gateway NAS Connectivity Application Server NAS Gateway Storage Array Application Server IP FC SAN Client Additional Task Research on suitable environments for implementing Integrated & Gateway NAS

© 2009 EMC Corporation. All rights reserved. Hosting and Accessing Files on the NAS Steps to host a file system: oCreate an array volume oAssign volume to NAS device oCreate a file system on the volume oMount the file system oAccess the file system oUse NFS in UNIX environment oExecute mount/nfsmount command oUse CIFS in windows environment oMap the network drive as: \\Account1\Act_Rep

© 2009 EMC Corporation. All rights reserved. NAS Management oMost ship with vendor management software oHave unique management issues oRequire preliminary analysis oNeed additional complementary software

© 2009 EMC Corporation. All rights reserved. Managing NAS Environments oManaging an Integrated System oBoth NAS component and the storage array are managed via NAS management software oManaging a Gateway System oNAS component managed via NAS management software oStorage array managed via array management software

© 2009 EMC Corporation. All rights reserved. Traditional File Server Environment – Example 1 Web Database Transaction Mission Critical Servers IP FC SAN Windows File Server UNIX File Server Internal Users Business ClientsSurfers, Shoppers

© 2009 EMC Corporation. All rights reserved. Storage Consolidation with NAS Database Transaction Mission Critical Servers LAN/WAN FC SAN NAS Head Internal Users Surfers, Shoppers Business Clients

© 2009 EMC Corporation. All rights reserved. Traditional File Server Environment – Example 2 General purpose OS serving files via FTP, CIFS, NFS, HTTP... UNIXNT W2K UNIXWindows IP

© 2009 EMC Corporation. All rights reserved. Server Consolidation with NAS NAS General purpose OS serving files via FTP, CIFS, NFS, HTTP... UNIXWindows IP

© 2009 EMC Corporation. All rights reserved. Chapter Summary oKey topics covered in this chapter: oNAS Benefits oNAS Components oNAS File Sharing Protocols oCIFS and NFS oNAS Implementation oIntegrated NAS oGateway NAS oHosting and Accessing File on NAS oNAS Management oNAS Examples Additional Task Research on factors affecting NAS Performance, Virtual LUN & Jumbo Frames

© 2009 EMC Corporation. All rights reserved. Check your Knowledge oWhat is the difference between an Integrated and Gateway NAS solution? oWhich NAS type would you deploy if you already have a SAN and storage array? oWhich NAS type is the simplest to deploy? oWhich file serving environments typically uses CIFS and NFS?

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