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Chapter 3. InfiniBand technology 39
service and does not follow the same flow control restriction as other VLs on the links. Subnet
management information is passed through the subnet ahead of all other traffic on a link
Subnet Manager (SM)
The SM monitors the health and performance of the InfiniBand subnet, maintains topology
information, and provides routing information to all of the switches in the network. These
responsibilities include LID assignment, SL-to-VL mapping, link bringup and teardown,
and link failover.
There must be at least one SM for a subnet and the SM must reside within the fabric
subnet, either on a switch or host node. Backup SMs can be defined in the network in the
event that the primary SM should fail.
Subnet Management Agents (SMAs)
The nodes within the subnet will maintain SMAs that process data from the SM.
Subnet Management Packets (SMPs)
Managers and agents communicate through Management Datagrams (MADs). SMPs are
used for communication between SMs and SMAs.
3.4.2 General services interface
The second method defined by InfiniBand is the general services interface (GSI). The GSI
handles functions such as chassis management, out-of-band I/O operations, and other
functions not associated with the subnet manager. These functions do not have the same
high-priority needs as subnet management, so the GSI management packets (GMPs) do not
use the high-priority virtual lane, VL15. All GSI commands use QP1 and must follow the flow
control requirements of other data links.
General Service Manager (GSM)
The GSM provides a variety of management functions not maintained by the SM including
performance, communication, and chassis management for physical devices.
General Service Agents (GSAs)
GSAs run on the nodes of the subnet and maintain management data and parameters
managed by GSMs.
General Service Management Packets (GMPs)
GMPs are used for communication general service managers and general service agents.
3.5 Common markets
Important markets, such as application clustering, storage area networks, inter-tier
communication and interprocessor communication, require high bandwidth, QoS, and RAS
features. Also, many embedded systems (including routers, storage systems, and intelligent
switches) utilize the PCI bus, often in the Compact PCI format, for their internal I/O
architecture. Such systems are unable to keep up with high-speed networking interconnects
such as Gigabit Ethernet and ATM. Therefore, many companies are developing proprietary
I/O interconnect architectures.
Building on the experience of developing Ethernet local area networks (LAN), Fibre Channel
storage area networks, and numerous wide area network (WAN) interconnects, InfiniBand
has been networked to exceed the needs of today’s markets and provide a cohesive
interconnect for a wide range of systems. This is accomplished with direct support for highly
important items such as RAS, QoS, and scalability.
- Redpaper 1
- October 2007 3
- Contract with IBM Corp 4
- Contents 5
- Contents v 7
- Trademarks 10
- Become a published author 13
- Comments welcome 13
- IBM BladeCenter products and 15
- 1.1 BladeCenter chassis 16
- 1.2 Blade servers 19
- 4X InfiniBand networking only 27
- InfiniBand products for 29
- BladeCenter 29
- OK (Green) and Fault (Yellow) 38
- 2.6.2 InfiniBand DDR HCAs 39
- InfiniBand technology 45
- 3.1.1 Upper layer protocols 46
- 3.1.2 Transport layer 46
- 3.1.3 Network layer 47
- 3.1.4 Data link layer 47
- 3.1.5 Physical layer 48
- 12X Link 49
- 3.2.3 Storage RDMA Protocol 50
- 3.3 Hardware 52
- 3.4 Management 52
- 3.5 Common markets 53
- 3.5.1 Application clustering 54
- 3.5.3 Storage area networks 54
- Configuring InfiniBand with 55
- QLogic bridges 55
- 4.1.1 Installing the drivers 56
- 4.1.5 Hints and tips 74
- Figure 4-66 Active SRP Map 89
- Figure 4-67 Add Direct Map 90
- Figure 4-70 93
- 5.2.3 Configuring IPoIB 105
- Cisco 3012 InfiniBand to FC 109
- 6.2 Blade booting from a SAN 110
- Installing hardware 111
- Figure 6-6 Define SRP host 114
- 6.2.5 Configuring storage 118
- 6.2.6 Discovering storage 119
- 6.2.8 Port masking 120
- Loading SCSI driver 128
- Loading ts_srp_host driver 128
- Configuring the Cisco 3012 131
- 7.2 Client information 136
- 7.3.1 The design 137
- EGW = Ethernet Gateway Module 147
- BG1 = Bridge Group 1 147
- Blue = InfiniBand 147
- Green = Ethernet 147
- Int Po5 153
- Figure 7-25 164
- 7.7 Useful CLI commands 169
- 7.7.2 For the 4948 170
- Abbreviations and acronyms 171
- Related publications 173
- Online resources 174
- Help from IBM 174
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