Brocade Design Doc

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SAN design

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    Brocade SAN DesignGuide

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    Table of Contents

    Preface............................................................................................................................................ 5Section 1 : Overview of SAN Design........................................................................................ 6

    The Brocade Product Line .......................................................................................................... 6SilkWorm 2000....................................................................................................................... 6SilkWorm 3000....................................................................................................................... 6SilkWorm 6400....................................................................................................................... 7SilkWorm 12000..................................................................................................................... 9

    Design Considerations ................................................................................................................ 9Design Terminology ................................................................................................................. 10SAN Solutions .......................................................................................................................... 11

    Storage Consolidation........................................................................................................... 12LAN-Free Backup................................................................................................................. 13Clustering.............................................................................................................................. 15

    Summary................................................................................................................................... 15Section 2 : SAN Design Concepts........................................................................................... 16

    Availability ............................................................................................................................... 16Availability Classifications................................................................................................... 17Resilient Fabrics.................................................................................................................... 18Redundant Fabrics ................................................................................................................ 19

    Scalability ................................................................................................................................. 21Performance .............................................................................................................................. 24

    Blocking and Congestion...................................................................................................... 24Locality ................................................................................................................................. 25ISL Over-Subscription .......................................................................................................... 26Bandwidth Consumption and Congestion ............................................................................ 28I/O Profiles............................................................................................................................ 30

    Device Attachment Strategies................................................................................................... 34Performance and Scalability Effects..................................................................................... 34Tiered Fabrics ....................................................................................................................... 35High Locality Device Attachment ........................................................................................ 38

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    Section 3 : Fabric Topologies ................................................................................................. 39Simple Topologies .................................................................................................................... 39

    Cascade ................................................................................................................................. 39Ring....................................................................................................................................... 40Full Mesh .............................................................................................................................. 41Partial Mesh .......................................................................................................................... 42Core/Edge ............................................................................................................................. 44

    Hybrid Topologies .................................................................................................................... 46Complex Core ....................................................................................................................... 47Composite Core/Edge ........................................................................................................... 47Summary............................................................................................................................... 48

    Section 4 : Switch Platform Considerations.......................................................................... 50Port Count ................................................................................................................................. 50ISL TrunkingTM......................................................................................................................... 50

    What Is Trunking? ................................................................................................................ 50How Does Trunking Impact SAN Design? .......................................................................... 52

    How 2 Gbit/sec Switches Impact a SAN Design...................................................................... 532 Gbit/sec Switch Placement ................................................................................................ 53More Ports or Higher Performance? ..................................................................................... 54

    Cabling For High Availability .................................................................................................. 55SilkWorm 12000 Device Attachment Strategies .................................................................. 56SilkWorm 12000 Availability Considerations...................................................................... 57

    Section 5 : Testing and Fabric Support Levels..................................................................... 58Section 6 : Reference Topologies............................................................................................ 59

    16-Port Switch Designs............................................................................................................. 6056-Port Fabric ....................................................................................................................... 6096-Port Fabric ....................................................................................................................... 61160-Port Fabric ..................................................................................................................... 62224-Port Fabric ..................................................................................................................... 62Extended Distance Topology................................................................................................ 63

    64-Port Switch Designs............................................................................................................. 6464-Port Fabric ....................................................................................................................... 64124-Port Fabric ..................................................................................................................... 65

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    248-Port Fabric ..................................................................................................................... 66368-Port Fabric ..................................................................................................................... 67

    16- and 64-Port Switch Mixed Designs .................................................................................... 68440-Port and 512-Port Fabrics .............................................................................................. 68

    Copyright ..................................................................................................................................... 69

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    Preface

    No matter how big a single switch might be, eventually a requirement for one more port than thatswitch supports will arise. This n+1 problem is solved with networking. All Storage AreaNetwork (SAN) designs should involve planning for networks of switches, even if they do nothave network requirements initially. The Brocade SAN Design Guide discusses factors thatinfluence fabric topology and overall SAN architecture, and facilitates storage network design byexplaining:

    When and how to connect fabric switches together When to leave them un