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For examples of redundant, partially-redundant, and non-redundant host and drive
loop configurations, see “Fibre channel host loop configurations.”
Fibre channel connections
The storage subsystem fibre channel connection consists of up to four host
fibre-channel loops and a redundant drive fibre-channel loop. The host fibre-channel
loops provide the fibre path for host attachment. They can consist of fibre-channel
cables, SFPs, host bus adapters, fibre-channel switches, and RAID controllers. The
redundant drive fibre-channel loop provides the fibre path from the DS4700 Express
Storage Subsystem to the hard disk drives (HDDs) in the storage expansion
enclosures. The redundant drive fibre-channel loop consists of the DS4700 Express
Storage Subsystem, the storage expansion enclosures, fibre-channel cables, and
SFPs.
The DS4700 Express supports redundant drive channel loop configurations. You
can build a redundant drive channel loop by connecting one or more storage
expansion enclosures to the redundant RAID controllers. Then, use dual fiber-optic
cables to connect one storage expansion enclosure to another in a daisy-chain. For
more information, see “Connecting storage expansion enclosures to the DS4700
Express” on page 68.
Fibre channel host loop configurations
You must determine how the host systems will connect to the storage subsystem.
You can connect up to four host systems directly to the storage subsystem, or you
can connect more than two hosts to the fibre channel storage subsystem through
switches. The illustrations in the following sections show common host system
configurations.
Host 1, Host Adapter 1 and 2
Host 4, Host Adapter 1 and 2
Host 2, Host Adapter 1 and 2
Host 3, Host Adapter 1 and 2
ds470024
1234
12 34
Figure 86. Cabling diagram for four redundant host connections
Chapter 3. Cabling the storage subsystem 107
- GC26-7843-05 1
- Sixth Edition (November 2011) 4
- Contents 5
- Contents v 7
- Contents vii 9
- © Copyright IBM Corp. 2010 ix 11
- Figures xi 13
- © Copyright IBM Corp. 2010 xv 17
- Class 1 Laser Product 19
- Laser Klasse 1 19
- Laser Klass 1 19
- Luokan 1 Laserlaite 19
- Apparell Laser de Calsse 1À 19
- Safety xix 21
- Cable Warning: 22
- About this document 23
- About this document xxiii 25
- About this document xxv 27
- Before you call 28
- Using the documentation 28
- Finding DS4000 readme files 29
- Web sites 29
- Software service and support 30
- Hardware service and support 30
- Fire suppression systems 31
- How to send your comments 31
- Chapter 1. Introduction 33
- Operating system support 35
- Fibre channel defined 35
- SATA defined 35
- Inventory checklist 35
- Best practices guidelines 37
- Storage subsystem components 38
- Chapter 1. Introduction 7 39
- Controllers 40
- Chapter 1. Introduction 9 41
- Chapter 1. Introduction 11 43
- AC power supply and fan units 44
- Chapter 1. Introduction 13 45
- DC power supply and fan units 46
- Chapter 1. Introduction 15 47
- Battery units 49
- SFP modules 51
- Telco bezel 51
- Determining firmware levels 53
- Specifications 54
- Area requirements 54
- 77027-03 55
- Temperature and humidity 56
- 77027-02 57
- Electrical requirements 58
- Chapter 1. Introduction 27 59
- Chapter 1. Introduction 29 61
- Installation overview 63
- Serial number 64
- Machine type 64
- Model number 64
- Preparing for installation 66
- Tools and hardware required 67
- Preparing the site 67
- Preparing the rack cabinet 68
- Installing the support rails 68
- Rear of Rack 72
- Removing a controller 73
- Removing an E-DDM 77
- Front of Rack 79
- Replacing the components 80
- Replacing an E-DDM 84
- Installing a Telco bezel 85
- Enclosure ID settings 87
- Number Description 88
- 1 Enclosure ID 88
- Handling fibre-optic cables 89
- Installing SFP modules 90
- Protective cap 92
- Plastic tab 92
- SFP module 92
- Fibre-optic 95
- LC connector 97
- SC connector 97
- Redundant drive channel pair 100
- Redundant 101
- Drive Channel 101
- Recommended cabling 107
- DS4000 Storage Subsystem 127
- DS4700 Express 129
- Host 1, Host Adapter 1 and 2 138
- Host 2, Host Adapter 1 and 2 138
- Fibre channel connections 139
- Web pages 150
- Hardware responsibilities 150
- Firmware updates 156
- Checking the LEDs 157
- Front LEDs 159
- Battery unit LEDs 160
- Controller LEDs 161
- Diagnostic LED 164
- Cache memory 173
- Subsystem cache battery 174
- Replacing a controller 178
- F10ug009 179
- F10ug010 180
- Guide pin 181
- Working with hot-swap E-DDMs 183
- Table 49. Drive LED activity 184
- LED LED state Descriptions 184
- Installing hot-swap E-DDMs 185
- Figure 111. E-DDM CRU handle 186
- Replacing hot-swap E-DDMs 187
- Replacing multiple E-DDMs 188
- 77025-01 195
- Ds470011 200
- Replacing a battery unit 207
- Replacing an SFP module 209
- Replacing a midplane 210
- 810midpl 212
- General checkout 215
- Solving problems 215
- Parts listing 220
- Appendix A. Records 223
- Sample information record 225
- Installed device records 226
- Rack Mounting 228
- Template 228
- Appendix C. Power cords 231
- Appendix C. Power cords 201 233
- Appendix E. Accessibility 245
- Trademarks 247
- Important notes 248
- Particulate contamination 249
- Documentation format 249
- Notices 219 251
- Glossary 253
- Glossary 223 255
- Glossary 225 257
- Glossary 227 259
- Glossary 229 261
- Index 233 265
- Index 235 267
- Web sites (continued) 268
- SAN support xxvii 268
- Part Number: 94Y8472 270
- Printed in USA 270
- (1P) P/N: 94Y8472 270
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