Network-Attached Storage Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. Network-Attached Storage Chapter 7(5.3) NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

File Sharing Environment Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. 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 Client/server model is implemented with file-sharing protocols for remote file sharing Example: FTP, CIFS and NFS NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

File Sharing Technology Evolution Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. File Sharing Technology Evolution Networked File Sharing Portable Media for File Sharing Networked PCs Stand Alone PC NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT) Network Attached Storage (NAS)

Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. What is NAS ? NAS is shared storage on a network infrastructure Clients Application Server Print Server NAS Device NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

General Purpose Servers vs. NAS Devices Copyright © 2009 EMC Corporation. Do not Copy - 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 NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT) General Purpose Servers (Windows or UNIX)

Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. Benefits of NAS Improves efficiency Improved flexibility Centralized storage Simplifies management Scalability High availability – through native clustering Provides security integration to environment (user authentication and authorization) NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. Components of NAS UNIX NFS Network Interface NAS Head NFS CIFS IP NAS Device OS Storage Interface CIFS Windows Storage Array NAS NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

NAS File Sharing Protocols Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. 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 NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Network File System (NFS) Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. 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 NFS v2 was stateless and uses UDP as the transport layer protocol NFS v3 added TCP as an option for transport layer protocol NFS v4 uses stateful protocol Aimed to provides support to cluster server deployment Allow scalable parallel access to the files distributed among multiple servers NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. 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 NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. NAS I/O IP Network NAS Device Client 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 TCP/IP Stack TCP/IP Stack 1 Network Interface Network Interface 4 NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. NAS Implementations Integrated NAS IP NAS Device NAS Gateway IP FC SAN NAS Head Storage Array NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Integrated NAS Connectivity Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. Integrated NAS Connectivity Clients Application Server IP Integrated NAS System Application Server NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Gateway NAS Connectivity Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. Gateway NAS Connectivity Application Server Client Client IP FC SAN Application Server Client Storage Array NAS Gateway NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Hosting and Accessing Files on the NAS Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. 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 NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. NAS Management Ships with vendor management software Have unique management issues Require preliminary analysis Need additional complementary software NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Managing NAS Environments Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. 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 NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Traditional File Server Environment – Example 1 Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. Traditional File Server Environment – Example 1 Internal Users Business Clients Surfers, Shoppers IP Web Database Transaction Mission Critical Servers Windows File Server UNIX File Server FC SAN NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Storage Consolidation with NAS Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. Storage Consolidation with NAS Internal Users Business Clients Surfers, Shoppers LAN/WAN Database Transaction Mission Critical Servers NAS Head FC SAN NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Traditional File Server Environment – Example 2 Copyright © 2009 EMC Corporation. Do not Copy - 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. . . NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Server Consolidation with NAS Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. Server Consolidation with NAS NAS IP UNIX Windows General purpose OS serving files via FTP, CIFS, NFS, HTTP. . . NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. Chapter Summary Key topics covered in this chapter: NAS Benefits NAS Components NAS File Sharing Protocols CIFS and NFS NAS Implementation Integrated NAS Gateway NAS NAS Management NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Concept in Practice – EMC Celerra Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. Concept in Practice – EMC Celerra Celerra is: 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 NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

Joining the Building Blocks - Integrated Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. Joining the Building Blocks - Integrated Data Mover IP Network Internal Network Switch Control Station Serial cable connect Internal network connect NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT) Fibre Channel storage connect

Joining the Building Blocks - Gateway Copyright © 2009 EMC Corporation. Do not Copy - All Rights Reserved. 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 NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT) Fibre Channel storage connect