1. Network-Attached Storage
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Network-Attached Storage
Chapter 7(5.3)
NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

2. File Sharing Environment
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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)

3. File Sharing Technology Evolution
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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)

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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)

5. General Purpose Servers vs. NAS Devices
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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)

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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)

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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)

8. NAS File Sharing Protocols
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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)

9. Network File System (NFS)
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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)

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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)

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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)

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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)

13. Integrated NAS Connectivity
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Integrated NAS Connectivity
Clients
Application Server IP
Integrated NAS System
Application Server
NAS(ISMDR:BEIT:VIII:Chap5.3,Madhu N. PIIT)

14. Gateway NAS Connectivity
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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)

15. Hosting and Accessing Files on the NAS
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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)

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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)

17. Managing NAS Environments
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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)

18. Traditional File Server Environment – Example 1
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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)

19. Storage Consolidation with NAS
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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)

20. Traditional File Server Environment – Example 2
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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)

21. Server Consolidation with NAS
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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)

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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)

23. Concept in Practice – EMC Celerra
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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)

24. Joining the Building Blocks - Integrated
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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

25. Joining the Building Blocks - Gateway
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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