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Section 3 – Networked Storage. Introduction. 本章目标及内容. 面对不断增长的信息需求和不断发展的网络技术,网络存储应运产生。本章分别介绍了网络存储环境下的直连存储、网络附加存储、光纤存储局域网、 IP 存储局域网和内容寻址存储,并深入介绍了这些网络存储结构的概念、结构特点、基本原理以及应用环境等方面的知识。 本章内容包括 5 个方面: 3.1 直连存储( Direct Attached Storage , DAS )

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slide2
本章目标及内容

面对不断增长的信息需求和不断发展的网络技术,网络存储应运产生。本章分别介绍了网络存储环境下的直连存储、网络附加存储、光纤存储局域网、IP存储局域网和内容寻址存储,并深入介绍了这些网络存储结构的概念、结构特点、基本原理以及应用环境等方面的知识。

本章内容包括5个方面:

3.1 直连存储(Direct Attached Storage,DAS)

3.2 网络附加存储(Network Attached Storage,NAS)

3.3 光纤存储局域网络(Fibre Channel Storage Area Networks,SAN)

3.4 IP存储局域网(IP Storage Area Networks,IP SAN)

3.5 内容寻址存储(Content Addressed Storage,CAS)

Module TitleStorage Networking Overview

section objectives
Section Objectives

Upon completion of this section, you will be able to:

  • Describe the elements, connectivity, and management of: Direct Attached Storage (DAS), Network Attached Storage (NAS), FC and IP Storage Area Networks (SAN), Content Addressed Storage (CAS)
  • Compare the benefits and challenges of each of the storage models

Module TitleStorage Networking Overview

in this section
In this Section …

This section contains the following modules:

  • Direct Attached Storage (DAS)
  • Networked Attached Storage (NAS)
  • Fibre Channel Storage Area Networks (FC SAN)
  • IP Storage Area Networks (IP SAN)
  • Content Addressed Storage (CAS)

Module TitleStorage Networking Overview

direct attached storage das1
Direct Attached Storage (DAS)

After completing this module you will be able to:

  • Discuss the benefits of DAS based storage strategy
  • Describe the elements of DAS
  • Describe the connectivity options for DAS
  • Discuss DAS management considerations
  • Identify the best environments for DAS solutions

Module TitleStorage Networking Overview

what is das
What is DAS?

Internal

External Direct Connect

Module TitleStorage Networking Overview

das benefits
DAS Benefits
  • Ideal for local data provisioning
  • Quick deployment for small environments
  • Simple to deploy in simple configurations
  • Reliability
  • Low capital expense
  • Low complexity

Module TitleStorage Networking Overview

physical elements of das

Connectivity

Physical Elements of DAS

Storage

CPU

  • Motherboard
  • Clustered group of processors
  • Processor cards
  • Complete system
  • Internal
  • External
  • Hard disk(s)
  • CD-ROM drive
  • Optical drive
  • Removable media
  • Tape devices/tape library
  • RAID/intelligent array(s)
  • Portable media drives

Module TitleStorage Networking Overview

das connectivity
DAS Connectivity

Block-Level Access Protocols:

  • ATA (IDE) and SATA
    • Primarily for internal bus
  • SCSI
    • Parallel (primarily for internal bus)
    • Serial (external bus)
  • Buss and Tag
    • Primarily for external mainframe
    • Precursor to ESCON and FICON

Module TitleStorage Networking Overview

das connectivity internal
DAS Connectivity: Internal

Module TitleStorage Networking Overview

internal das connectivity examples
Internal DAS Connectivity Examples

Parallel Connectivity Cables

Serial Connectivity Cable

50-wire SCSI-2 cable

80-wire IDE cable

34-wire floppy cable

Serial ATA cable

Module TitleStorage Networking Overview

das connectivity external

Example of an external connectivity cable

DAS Connectivity: External

External DAS

HBA

HBA

Host

Storage Device

Module TitleStorage Networking Overview

das management internal
DAS Management: Internal
  • Host provides:
    • Disk partitioning (Volume management)
    • File system layout
    • Data addressing
  • Direct Attached Storage managed individually through the server and the OS

Module TitleStorage Networking Overview

das management external
DAS Management: External
  • Array based management
  • Availability – multi-path I/O
  • Lower TCO for managing data and storage Infrastructure

Module TitleStorage Networking Overview

das performance considerations
DAS Performance Considerations

Factors to be considered for DAS performance:

  • Hard disks
  • Memory cache
  • Virtual memory (paging)
  • Storage controllers
    • Protocol supported (e.g. SCSI, FireWire, USB, etc.)
  • RAID level
  • Bus

Module TitleStorage Networking Overview

internal das application example
Internal DAS Application Example

Hard Drive

40 Pin Ribbon Cable

Motherboard

Module TitleStorage Networking Overview

external das application example
External DAS Application Example

Cable for external DAS connectivity

ESCON HBA

Module TitleStorage Networking Overview

das challenges
DAS Challenges
  • Hosts must be directly connected
  • Data availability
  • Data slowdowns possible
    • CPU congestion, caching, multi-pathing
  • Scalability is limited
    • Number of connectivity ports to hosts
    • Number of addressable disks
    • Distance limitations
  • Downtime required for maintenance

Module TitleStorage Networking Overview

module summary
Module Summary

Key points covered in this module:

  • DAS can be:
    • An integrated part of the host computer
    • Directly connected to a single server
  • DAS is made up of a CPU, connectivity, and storage devices
    • There are several options within each of these categories
  • DAS connectivity uses block-level access protocols

Module TitleStorage Networking Overview

check your knowledge

Check Your Knowledge
  • What are the physical elements of DAS?
  • Give an example of when DAS is a good solution.
  • Describe internal DAS connectivity.
  • Describe external DAS connectivity.
  • What are some areas that you need to consider as part of DAS management?

Module TitleStorage Networking Overview

nas network attached storage
NAS – Network Attached Storage

After completing this module, you will be able to:

  • Discuss the benefits of NAS based storage strategy
  • Describe the elements of NAS
  • Discuss connectivity options for NAS
  • Discuss NAS management considerations by environment
  • Identify the best environments for NAS solutions

Module TitleStorage Networking Overview

in this module
In this Module …

This module contains the following lessons:

  • What is NAS?
  • Managing a NAS Environment
  • NAS Application Examples

Module TitleStorage Networking Overview

lesson what is nas
Lesson: What is NAS?

Upon completion of this lesson, you should be able to:

  • Define NAS and describe its key attributes
  • List the benefits of NAS
  • Describe NAS connectivity

Module TitleStorage Networking Overview

nas evolution
NAS Evolution

Networked File Sharing

Portable Mediafor File Sharing

Networked PCs

Stand Alone PC

Network Attached Storage (NAS)

Module TitleStorage Networking Overview

what is nas
What is NAS?

NAS is shared storage on a network infrastructure.

Clients

NAS Head

Storage

ApplicationServer

PrintServer

NAS Device

Module TitleStorage Networking Overview

general purpose servers vs nas devices
General Purpose Servers vs. NAS Devices

Applications

Print Drivers

File System

File System

Operating System

I/O

Network

Operating System

Network

Single Function Device(NAS Server)

General Purpose Server(NT or Unix Server)

Module TitleStorage Networking Overview

why nas
Why NAS?
  • Supports global information access
  • Improves efficiency
  • Provides flexibility
  • Centralizes storage
  • Simplifies management
  • Scalability
  • High availability – through native clustering
  • Provides security integration to environment (user authentication and authorization)

Module TitleStorage Networking Overview

customer demands for nas have changed
Customer Demands for NAS Have Changed

T H E P A S T

T O D A Y

Critical BusinessApplications(Databases)

Outside theData Center

IntegratedInfrastructure

Islands ofInformation

EnterpriseManagement

Tools andScripts

Module TitleStorage Networking Overview

nas device components
NAS Device Components

NAS Device

Network Interface

NFS

CIFS

IP Network

NAS Device OS

Storage Interface

SCSI, FC, or ATA

Module TitleStorage Networking Overview

nas file services protocols nfs and cifs
NAS File Services Protocols: NFS and CIFS

Unix

NAS Device

NFS

Network Interface

NFS

CIFS

IP Network

NAS Device OS

Storage Interface

CIFS

Windows

SCSI, FC, or ATA

Module TitleStorage Networking Overview

network file system nfs
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

Module TitleStorage Networking Overview

common internet file system cifs
Common Internet File System (CIFS)
  • Public version of the Server Message Block (SMB) protocol
  • Client applications access files on a computer running server applications that accept the SMB protocol
  • Better control of files than FTP
  • Potentially better access than Web browsers and HTTP

Module TitleStorage Networking Overview

nas connectivity a closer look
NAS Connectivity: A Closer Look

NFS

Application

FTP, TelnetSMTP, SNMP

Presentation

XDR

RPC

Session

Transport

TCP, UDP

IP

Network

ARP / RARP

Data Link

Not Defined

Physical

OSI Seven-Layer Module

Internet Protocol Suite

Module TitleStorage Networking Overview

i o example
I/O Example

Application

Storage Interface

Block I/O to storage device

Operating System

Storage Protocol

I/O Redirect

NAS Operating System

NFS / CIFS

NFS / CIFS

TCP/IP Stack

TCP/IP Stack

Network Interface

Network Interface

Client

NAS Device

IP Network

Module TitleStorage Networking Overview

slide37

UNIX and Windows Information Sharing

NFS Traffic

FTP

CIFS Traffic

Protocol Layer

Common File System (CFS)

Multi-protocol support layer

OS

I/O layer

Module TitleStorage Networking Overview

nas physical elements
NAS Physical Elements
  • Data movers/filers
  • Management interface
    • Configure network interfaces
    • Create, mount, or export file system
    • Install, configure and manage all data movers/filers
    • Can be accessed locally or remotely
  • Connectivity
    • NAS head to storage
    • NAS head to network
  • Storage

Module TitleStorage Networking Overview

integrated vs gateway nas
Integrated vs. Gateway NAS

Integrated NAS

IP Network

NAS Head

NAS Gateway

FC Fabric

IP Network

NAS Head

Module TitleStorage Networking Overview

integrated nas system
Integrated NAS System

Integrated NAS System

Direct Attach

IP Network

NAS Head

Storage

Module TitleStorage Networking Overview

gateway nas system
Gateway NAS System

Clients

IP Network

Application Servers

IP Network

FC Switch

NAS Gateway

Storage

Module TitleStorage Networking Overview

lesson summary
Lesson Summary
  • A NAS server is an appliance optimized for file serving functions.
  • Generally it has a specialized operating system
  • NAS supports multiple protocols
  • NAS can be implemented as an integrated system or as a gateway

Module TitleStorage Networking Overview

lesson managing in a nas environment
Lesson: Managing in a NAS Environment

Upon completion of this lesson, you will be able to:

  • Describe the issues involved in managing a NAS environment
  • Differentiate between the issues related to managing an integrated system vs. a gateway system

Module TitleStorage Networking Overview

about managing nas devices
About Managing NAS Devices
  • Most ship with vendor management software
  • Have unique management issues
  • Require preliminary analysis
  • Need additional complementary software

Module TitleStorage Networking Overview

nas management concerns
NAS Management Concerns
  • Performance
  • Discovery
  • Space Management
  • Backup/Recovery
  • Asset Management

Module TitleStorage Networking Overview

managing nas environments
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

Module TitleStorage Networking Overview

lesson summary1
Lesson Summary

Key points covered in this lesson:

  • NAS management involves several areas: performance, discovery, space management, backup/recovery, and asset management
  • The management is handled differently in integrated and gateway NAS environments

Module TitleStorage Networking Overview

lesson nas examples
Lesson: NAS Examples

Upon completion of this lesson, you will be able to:

  • Discuss environments that would benefit from a NAS solution including:
    • NAS solution for HTTP file server
    • NAS consolidation
    • NAS solution for Gateway NAS system

Module TitleStorage Networking Overview

nas http file server scenario
NAS HTTP File Server Scenario

Current Environment

Internal Users

Business Clients

Surfers, Shoppers

LANs / WANs

Web DatabaseTransactionMission CriticalServers

SAN(Fibre Channel)

Module TitleStorage Networking Overview

nas http file server example
NAS HTTP File Server Example

Solution

Internal Users

Business Clients

Surfers, Shoppers

LANs / WANs

HTTPServer

NAS Head

SAN(Fibre Channel)

Database transactionmission critical servers

Module TitleStorage Networking Overview

nas server consolidation scenario
NAS Server Consolidation Scenario

Current Environment

UNIX

NTW2K

Internet/Intranet

UNIX

Windows

General purpose OS serving files viaFTP, CIFS, NFS, HTTP. . .

Module TitleStorage Networking Overview

nas server consolidation example
NAS Server Consolidation Example

Solution

NASFileServer

Internet/Intranet

UNIX

Windows

General purpose OS serving files viaFTP, CIFS, NFS, HTTP. . .

Module TitleStorage Networking Overview

gateway nas scenario
Gateway NAS Scenario
  • Why purchase additional Integrated NAS Storage when you have SAN Storage?
  • Capitalize on your storage investment and purchase NAS functionality without the cost of additional NAS Storage.

Module TitleStorage Networking Overview

gateway nas example
Gateway NAS Example

MultipurposeServers

NT

UNIX

IP Network

FC Switch

NAS Gateway

Module TitleStorage Networking Overview

example summary
Example Summary

Key points covered in this lesson:

  • HTTP example
  • Consolidation example
  • Gateway example

Module TitleStorage Networking Overview

nas challenges
NAS Challenges
  • Speed
    • Network latency and congestion
    • Protocol stack inefficiency
    • Application response requirements
  • Reliability
  • Connectivity
  • Scalability

Module TitleStorage Networking Overview

module summary1
Module Summary

Key points covered in this module:

  • A NAS server is a specialized appliance optimized for file serving functions.
  • Overview of physical and logical elements of NAS
  • Connectivity options for NAS
  • Common NAS topologies
  • NAS connectivity devices
  • NAS management considerations by environment
  • Best environments for NAS solutions

Module TitleStorage Networking Overview

check your knowledge1

Check Your Knowledge
  • What are the differences between a General Purpose Server and a NAS Device?
  • What are the components of a NAS device?
  • What protocol is used to connect to and manage physical disk storage resources in a NAS system?
  • Give an example of a file sharing protocol.
  • What is the difference between an integrated NAS system and a gateway NAS system?

Module TitleStorage Networking Overview

apply your knowledge
Apply Your Knowledge…

Upon completion of this topic, you will be able to:

  • Describe EMC’s product implementation of a NAS solution

Module TitleStorage Networking Overview

nas equipment building blocks
NAS equipment building blocks
  • NAS device consists of:
    • Network interface device (EMC called Data Mover)
    • Storage interface device (EMC called Data Mover)
    • Management interface device (EMC called a Control Station)
    • Storage connectivity mechanism
      • Direct connect
      • Gateway connect
  • Storage device

Storage Interface Device

Management Interface Device

CLARiiON

Storage Processor

Navisphere Manager

Symmetrix

FA (Fibre Channel Adapter)

Service Processor

Module TitleStorage Networking Overview

what is a data mover
What is a Data Mover ?

A Data Mover is a specialized hardware platform with :

  • Dual Intel Processors
  • PCI or PCI-X based
  • High memory capacity
  • Multi-port Network cards
  • Fibre Channel connectivity to storage arrays
  • No internal storage devices
  • Operates on a highly specialized Operating System, DART (Data Access in Real Time).

Module TitleStorage Networking Overview

what does a data mover do
What does a Data Mover Do?
  • Once a Data Mover has been presented storage from a storage array, the storage is divided up using an Automated Volume Management feature of DART to provide volumes for file system creation.
  • The Data Mover supports both NFS and CIFS protocols simultaneously and is able to server out data to either protocol individually or data to both protocols at the same time.
  • In order to share data out to differing clients simultaneously the Data Mover integrates into the security structures of both environments seamlessly

Module TitleStorage Networking Overview

data mover summary
Data Mover Summary

NS500 Data Mover

NS700 Data Mover

NSX Blade

Fibre I/O module GbE I/O module

Module TitleStorage Networking Overview

what is a control station
What is a Control Station ?

A Control Station is a dedicated management, Intel processor based computer running EMC Linux to provide:

  • Specialized software installation and upgrade portal
  • Management of high availability features
    • Fault monitoring
    • Fault recovery
    • Fault Reporting (CallHome)
  • Management of Data Mover configuration and storage for the system configuration database
  • Remote diagnosis and repair

Module TitleStorage Networking Overview

control station system management command line
Control Station System Management – Command Line

The Control Station provides both management interfaces to NAS administrators:

  • Command line can be accessed on the Control Station via:
    • An ssh interface tool (e.g. PuTTy)
    • Telnet (not enabled by default for security)
  • Its primary function is for the scripting of common repetitive tasks that may run on a predetermined schedule to ease administrative burden
  • It has approximately 80 UNIX command-like commands:
    • nas_ - Generally for the configuration and management of global resources
    • server_ - Generally for the configuration and management of Data Mover specific resources
    • fs_ - Generally for special file system operations

Module TitleStorage Networking Overview

control station system management gui management
Control Station System Management – GUI Management

Module TitleStorage Networking Overview

celerra ns family control station hardware
Celerra NS Family – Control Station Hardware

Module TitleStorage Networking Overview

joining the building blocks integrated
Joining the Building Blocks - Integrated

Data Mover

IP Network

Internal Network

Switch

Control Station

Serial cable connect

Internal network connect

Fibre Channel storage connect

Module TitleStorage Networking Overview

joining the building blocks gateway
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

Fibre Channel storage connect

Module TitleStorage Networking Overview