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© Copyright IBM Corp. 2008. All rights reserved. 93
Draft Document for Review September 2, 2008 5:05 pm4405ch04 Continuous availability and manageability.fm
Chapter 4. Continuous availability and
manageability
This chapter provides information about IBM Power Systems design features that help lower
the total cost of ownership (TCO). The advanced IBM RAS (Reliability, Availability, and
Service ability) technology allows the possibility to improve your architecture’s TCO by
reducing unplanned down time.
IBM POWER6 processor-based systems have a number of new features that enable systems
to dynamically adjust when issues arise that threaten availability. Most notably, POWER6
processor-based systems introduce the POWER6 Processor Instruction Retry suite of tools,
which includes Processor Instruction Retry, Alternate Processor Recovery, Partition
Availability Prioritization, and Single Processor Checkstop. Taken together, in many failure
scenarios these features allow a POWER6 processor-based system to recover transparently
without an impact on a partition using a failing core.
This chapter includes several features that are based on the benefits available when using
AIX as the operating system. Support of these features when using Linux can vary.
4.1 Reliability
Highly reliable systems are built with highly reliable components. On IBM POWER6
processor-based systems, this basic principle is expanded upon with a clear design for
reliability architecture and methodology. A concentrated, systematic, architecture-based
approach is designed to improve overall system reliability with each successive generation of
system offerings.
4.1.1 Designed for reliability
Systems designed with fewer components and interconnects have fewer opportunities to fail.
Simple design choices such as integrating two processor cores on a single POWER chip can
dramatically reduce the opportunity for system failures. In this case, a 16-core server will
include half as many processor chips (and chip socket interfaces) as with a
4
- Redpaper 1
- October 2008 3
- First Edition (October 2008) 4
- Contents 5
- Contents v 7
- Trademarks 10
- Become a published author 12
- Comments welcome 13
- General description 15
- 1.1 System specifications 17
- 1.2 Physical package 17
- 1.3 System features 18
- 1.3.2 Memory features 20
- 1.3.4 I/O drawers 22
- Front Rear 24
- 1.4 System racks 26
- Physical specifications 28
- Client responsibilities 28
- 1.4.5 Rack-mounting rules 31
- 1.4.6 Useful rack additions 32
- 1.4.7 OEM rack 33
- Architecture and technical 37
- 2.1 The POWER6 processor 38
- Figure 2-2 POWER6 processor 39
- 2.1.1 Decimal floating point 40
- 2.3 Processor cards 43
- 2.3.2 Processor clock rate 44
- 2.4 Memory subsystem 45
- 2.4.4 OEM memory 48
- 2.5 System buses 49
- 2.5.2 Service processor bus 50
- 2.6 Internal I/O subsystem 51
- 2.6.1 System ports 52
- POWER6 chip 56
- 2.8 PCI adapters 57
- 2.8.1 LAN adapters 58
- 2.8.2 SCSI and SAS adapters 58
- 2.8.3 iSCSI 59
- IBM iSCSI adapters 60
- 2.8.4 Fibre Channel adapter 61
- 2.8.5 Graphic accelerators 61
- 2.9 Internal storage 62
- 2.9.2 Split backplane 63
- 2.9.3 Internal media devices 63
- 2.10 External I/O subsystems 64
- 7311 Model D11 features 65
- PCI-X Bridge 66
- PCI-X slots 67
- SPCN cabling examples 68
- YO Cable 71
- IBM AIX 5L 77
- IBM AIX V6.1 77
- Linux for System p systems 78
- 2.13 Service information 79
- 2.14 System firmware 81
- System firmware download site 82
- 2.14.1 Service processor 84
- System Management Services 86
- Open Firmware 87
- Virtualization 89
- 3.1 POWER Hypervisor 90
- Virtual SCSI 91
- Virtual Ethernet 91
- Virtual (TTY) console 91
- 3.2 Logical partitioning 92
- 3.2.3 Processing mode 93
- Dedicated mode 94
- Shared dedicated mode 94
- Shared mode 94
- 3.3 PowerVM 95
- Shared Ethernet Adapter 96
- Chapter 3. Virtualization 83 97
- 3.3.3 PowerVM Lx86 99
- Supported Operating Systems 100
- Chapter 3. Virtualization 87 101
- Chapter 3. Virtualization 89 103
- 3.4 System Planning Tool 105
- Continuous availability and 107
- Component failure rates 108
- 4.2 Availability 109
- Persistent deallocation 110
- Memory protection 113
- Memory page deallocation 114
- Memory control hierarchy 114
- Memory deconfiguration 115
- L2 Array Protection 116
- 4.2.4 PCI Error Recovery 117
- 4.3 Serviceability 118
- 4.3.1 Detecting errors 119
- Error checkers 120
- Fault Isolation Registers 120
- 4.3.2 Diagnosing problems 121
- Boot-time 122
- Device drivers 122
- 4.3.3 Reporting problems 123
- Extended Error Data (EED) 124
- System dump handling 124
- Customer notify 124
- Call home 124
- Guiding light LEDs 125
- The operator panel 125
- Concurrent maintenance 126
- Blind-swap PCI adapters 126
- Firmware updates 126
- Repair and verify 127
- 4.5 Manageability 130
- Graphics terminal 134
- Example 4-1 135
- 4.6 Cluster solution 136
- Related publications 139
- Online resources 140
- How to get Redbooks 140
- Help from IBM 140
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