Transcript Network Attached Storage

Network-Attached Storage
Module 2.3
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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
© 2009 EMC Corporation. All rights reserved.
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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
 Traditional client/server model, implemented with filesharing protocols for remote file sharing
– Example: FTP, DNS
 DFS is another examples of file sharing implementation
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File Sharing Technology Evolution
Stand Alone PC
Portable Media
for File Sharing
Networked File Sharing
Networked PCs
Network Attached Storage (NAS)
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Network-Attached Storage - 4
What is NAS ?
NAS is shared storage on a network infrastructure
Clients
Application
Server
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Print
Server
NAS Device
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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
General Purpose Servers
(Windows or UNIX)
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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)
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Components of NAS
NFS
Network Interface
UNIX
NAS Head
NFS
IP
CIFS
NAS Device OS
Storage Interface
CIFS
Windows
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Storage Array
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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
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Network-Attached Storage - 9
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
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Network-Attached Storage - 10
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
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NAS I/O
2
Application
Storage Interface
Operating System
Network Protocol
I/O Redirect
NAS Operating System
NFS / CIFS
NFS / CIFS
TCP/IP Stack
3
Block I/O to
storage device
Storage Array
TCP/IP Stack
1
Network Interface
Network Interface
4
Client
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IP Network
NAS Device
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NAS Implementations
Integrated NAS
IP
NAS Device
NAS Gateway
IP
FC SAN
NAS Head
Storage Array
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Integrated NAS Connectivity
Clients
UNIX Server
IP
Integrated NAS System
Windows Server
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Gateway NAS Connectivity
Application Server
Client
Application Server
IP
FC SAN
Client
Storage Array
Client
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NAS Gateway
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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
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NAS Management
 Most ship with vendor management software
 Have unique management issues
 Require preliminary analysis
 Need additional complementary software
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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
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Traditional File Server Environment – Example 1
Internal Users
Business Clients
Surfers, Shoppers
IP
Windows
File Server
Web Database
Transaction
Mission
Critical
Servers
UNIX File
Server
FC SAN
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Storage Consolidation with NAS
Internal Users
Surfers, Shoppers
Business Clients
LAN/WAN
NAS
Head
Database
Transaction
Mission
Critical
Servers
FC SAN
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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. . .
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Server Consolidation with NAS
NAS
IP
UNIX
Windows
General purpose OS serving files via
FTP, CIFS, NFS, HTTP. . .
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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
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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)
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EMC Celerra NS-960
Integrated NAS
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Joining the Building Blocks - Integrated
Data Mover
IP Network
Internal Network
Switch
Control Station
Serial cable connect
Internal network connect
Fibre Channel storage connect
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Joining the Building Blocks - Gateway
Data Mover
Fibre Channel
NAS
NAS
NAS
NAS
NAS
NAS
SAN
SAN
SAN
SAN
SAN
SAN
Switch
IP Network
Internal Network
Switch
Control Station
SAN Host(s)
Serial cable connect
Internal network connect
Fibre Channel storage connect
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 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?
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