51CTO下载-SAN基础培训文档(Legato公司)

I LANs I LANs
use different protocols, different tools
are physically insecure at the desktop and potentially vulnerable at the server I LANs seldom have spare capacity for storage networking I LANs are tuned to favor short, “bursty” user transmissions vs large, continuous data transfers
Hubs and switches Bridges and extenders SAN management software
17 August 1999
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Promise of SAN
I I I I I I I I
Massively extended scalability Greatly enhanced device connectivity Storage consolidation LAN-free backup Serverless (active-fabric) backup Server clustering Heterogeneous data sharing Disaster recovery - Remote mirroring
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Objectives
This training prepares students to:
• Use and understand basic SAN terminology • Distinguish SAN from NAS and other storage network technologies • Understand where SANs can help users the most • Describe the configuration of SANs in the point-topoint, arbitrated loop, and switched fabric topologies • Cite the performance gains available through use of SAN technology • Recognize the distinguishing features of the main SAN products in today’s market
17 August 1999
© Copyright 2000, Legato Systems, Inc
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Traditional Connectivity
Channel
Memory Disk
Network
Processor
Closed, structured High performance Error-free Large data transfer Hardware intensive
17 August 1999
© Copyright 2000, Legato Systems, Inc
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SAN Components
I I
Servers with host bus adapters Storage systems
Q Q Q Q
RAID JBOD Tape Optical
I I I
Channel Network
Closed, structured High performance Error-free Large data transfer Hardware intensive
Open, unstructured Error-free secondary Peer to peer Data, voice, video Software intensive
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JBOD: “Just a Bunch of Disks”
Q Q Q
Drives independently attached to the I/O channel Scaleable, but requires server to manage multiple volumes Do not provide protection in case of drive failure
Channel transport ideal for SANs Multiple protocol support Networking capability and functionality Heterogeneous interconnect
bandwidth -- availability -- reliability -- integrity -- scalability
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High-performance backup Storage consolidation/expansion Disaster protection
17 August 1999
© Copyright 2000, Legato Systems, Inc
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What is a Storage Area Network?
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17 August 1999
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Scalability and Performance
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Storage expansion
Q
No impact on servers No impact on storage Active parallel paths Robust topology
17 August 1999
© Copyright 2000, Legato Systems, Inc
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Agenda
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Introduction to SANs SAN connectivity SAN components SAN applications
Basic terms and concepts Advantages of SANs SAN and NAS “A Fibre Channel Primer” Products and features
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SAN Storage
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RAID: “Redundant Array of Inexpensive Disks”
Q Q Q
Fault-tolerant grouping of disks that server sees as a single disk volume Combination of parity-checking, mirroring, striping Self-contained, manageable unit of storage
NAS
17 August 1999
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SAN and NAS
SAN
I I I I
NAS
I I I I
Remote storage access Private net for storage Storage protocols Centralized management Good for hosting large databases
100MB 100MB
17 August 1999
© Copyright 2000, Legato Systems, Inc
F A I L O V E R
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Network Attached Storage (NAS)
Dedicated, multi-protocol filer
File I/O File I/O
Attached directly to network
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Summary and Questions
SAN Benefits
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SANs fully exploit high-performance, highconnectivity network technologies SANs expand easily to keep pace with fast growing storage needs SANs allow any server to access any data SANs help centralize management of storage resources SANs reduce total cost of ownership
A dedicated network for servers and storage systems
LAN
SAN
17 August 1999
© Copyright 2000, Legato Systems, Inc
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Why Give Storage Its Own Network?
A good LAN does not make a good SAN !
Remote file access Shares user net Network protocols Distributed management Good for simple, scalable file sharing
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17 August 1999
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SAN Connectivity
“A Fibre Channel Primer”
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Fibre Channel
17 August 1999
Open, unstructured Error-free secondary Peer to peer Data, voice, video Software intensive
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Fibre Channel Connectivity
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Server expansion
Q
I
Load balancing
Q
I
Bandwidth on demand
Q
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High Availability
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Multiple levels of redundancy are configurable throughout data path Multiple access paths allow failover cluster configurations De-coupling of storage from application service allows it to be managed independently Data vaulting and disaster recovery configurations can address loss of service due to site failure
Fibre Channel
wk.baidu.com
17 August 1999
© Copyright 2000, Legato Systems, Inc
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SAN Topologies
Point-to-Point
100MB > < 100MB
Arbitrated Loop
100MB
100MB
Switched Fabric
SAN 101
A Foundation for Understanding
Storage Area Networks
Special thanks to our SAN 101 sponsors whose support helped bring you this course:
© Copyright 2000, Legato Systems, Inc