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3
Planning Considerations for Fibre Channel Topologies
3-15
Planning Considerations for Fibre Channel Topologies
Figure 3-9 Full Mesh Fabric
Full-mesh fabrics provide increased resiliency over cascaded or ring
fabrics and are well suited for applications that require any-to-any
connectivity. If a single ISL fails, traffic is automatically routed
through an alternate path.
Mesh fabrics also form effective backbones to which other SAN
islands can be connected. Traffic patterns through the fabric should
be evenly distributed and overall bandwidth consumption low.
When using low port-count fabric elements, mesh fabrics are best
used when the fabric is not expected to grow beyond four or five
switches. The cost of ISLs becomes prohibitive for larger mesh
fabrics. In addition, full-mesh fabrics do not scale easily because the
addition of a switch requires that at least one additional ISL be added
from every existing switch in the fabric. If less than four fabric
elements are used in a full-mesh fabric:
• A two-switch full mesh fabric is identical to a two-switch
cascaded fabric.
• A three-switch full mesh fabric is identical to a three-switch ring
fabric.
T
M
T
M
T
M
T
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Interswitch Link
Fabric Connection
- Products in a SAN 1
- Environment 1
- Planning Manual 1
- Contents 3
- Chapter 2 Product Management 4
- Appendix B Firmware Summary 7
- Introduction to McDATA 27
- Multi-Protocol Products 27
- Product Overview 28
- Cabinet-Mount McDATA Products 30
- SAN Management 31
- Applications 31
- Directors 32
- Director 33
- Performance 33
- Intrepid 6064 34
- Intrepid 6064 Director 35
- Intrepid 6140 36
- Intrepid 6140 Director 37
- Intrepid 10000 38
- Fabric Switches 40
- Fabric Switch 41
- Sphereon 3232 41
- Sphereon 4300 42
- Sphereon 4400 44
- Sphereon 4500 45
- Sphereon 4700 47
- SAN Routers 48
- SAN Router 49
- Eclipse 1620 SAN 50
- Eclipse 1620 SAN Router 51
- Eclipse 2640 SAN 52
- Product Features 54
- Security Features 57
- Serviceability 58
- Features 58
- Product Management 63
- Interface Summary 68
- Management Server Support 69
- Specifications 70
- Ethernet Hub 72
- Product Firmware 73
- Firmware Services 74
- Backup and Restore Features 75
- SAN Management Applications 77
- Sphereon 4300 Fabric Switch 78
- Hardware View 79
- SANvergence 80
- Manager 80
- EFCM Basic Edition Interface 82
- Command Line Interface 83
- Planning Considerations 85
- Topologies 85
- Fibre Channel Topologies 85
- Shared Mode Versus 87
- Switched Mode 87
- Switched Mode Operation 88
- Public Versus Private 90
- Private Device Connectivity 91
- Public Loop Connectivity 93
- Private Loop Connectivity 93
- FL_Port Connectivity 94
- Connecting FC-AL 95
- Devices to a 95
- Switched Fabric 95
- Tape Device 97
- Fabric Topologies 98
- Full Mesh Fabric 99
- Core-to-Edge 100
- 2-by-14 Core-to-Edge Fabric 101
- SAN Islands 102
- Fabric Topology 103
- Factors to Consider 104
- When Implementing 104
- Fabric Initialization 113
- Fabric Performance 114
- ISL Oversubscription 116
- High Device Locality 118
- Low Device Locality 118
- Interswitch Link 119
- Fabric Connection 119
- Device Fan-Out Ratio: 10 to 1 119
- Tier 2 Storage 120
- Tier 2 Servers 120
- Fabric Availability 121
- Fabric Scalability 123
- Obtaining 124
- Professional 124
- Services 124
- FCP and FICON in a 125
- Single Fabric 125
- CTP - 1 Card 127
- CTP - 0 Card 127
- SBAR - 1 Module 128
- SBAR - 0 Module 128
- Multiple Data 135
- Transmission Speeds 135
- FICON Cascading 136
- High-Integrity 137
- Minimum 137
- Requirements 137
- Best Practices 138
- Implementing SAN 143
- Internetworking Solutions 143
- SAN Island Consolidation 144
- Flexible Partitioning 146
- Technology 146
- SAN Routing 150
- SAN Routing Hierarchy 151
- SAN Routing Concepts 152
- Table 4-1 mSAN Routing Domain 160
- Figure 4-6 iFCP WAN Extension 166
- Table 4-3 mFCP Versus iFCP 170
- Inter-FlexPar Routing 171
- Implementing BC/DR Solutions 178
- Extended-Distance 179
- Operational Modes 179
- SAN Extension 181
- Transport 181
- Technologies 181
- Distance Extension 191
- Through BB_Credit 191
- Intelligent Port 193
- Consolidation 202
- Physical Planning 205
- Considerations 205
- Port Requirements 206
- SFP Optical 208
- Transceivers 208
- High-Availability 210
- Fibre Channel 211
- Cables and 211
- Connectors 211
- Routing Fiber-Optic 212
- Management 214
- Remote User 215
- Workstations 215
- SNMP Management 217
- EFCM Basic Edition 218
- Interface 218
- Security Provisions 219
- SANtegrity 220
- Authentication 220
- SANtegrity Binding 223
- PDCM Arrays 224
- PDCM Array - Example Problem 226
- Preferred Path 227
- Director Zoning 229
- Server and 233
- Storage-Level 233
- Access Control 233
- Security Best 234
- Practices 234
- Optional Feature Keys 237
- Flexport Technology 240
- OpenTrunking 241
- Full Volatility 242
- Full Fabric 242
- Remote Fabric 243
- N_Port ID 243
- Virtualization 243
- Element Manager 243
- Application 243
- Configuration Planning 245
- Task 1: Prepare a Site Plan 246
- Configuration Planning Tasks 247
- Task 5: Plan Ethernet Access 251
- Rules for Port Names 257
- Rules for Nicknames 258
- Task 14: Plan AC Power 272
- Product Specifications 283
- Power Requirements 285
- Heat Dissipation 287
- Clearances 287
- Operating 289
- Dimensions 290
- Cabinet Footprint 290
- Fabricenter Cabinet Footprint 291
- Firmware Summary 293
- System-Related Differences 293
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