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164 IBM Power 770 and 780 Technical Overview and Introduction
The Active Memory Mirroring can be disabled or enabled on the management console using
the Advanced tab of the server properties (Figure 4-5).
Figure 4-5 Enabling or disabling active memory sharing
The system must be entirely powered off and then powered on to change from mirroring
mode to non-mirrored mode.
This same frame also gives informations about the mirroring status:
Desired mirroring mode: Takes the values “Off” or “System firmware only”
System firmware mirroring status
– Fully mirrored: The mirroring is completely functional.
– Partially functional: Due to uncorrectable memory failures, some of the hypervisor
elements or objects are not mirrored. The system remains partially mirrored until DIMM
is replaced and the system is rebooted.
– Not mirrored: At the last power on of the system, the desired state was “mirroring off.’
Mirrorable memory: Total amount of physical memory that can be mirrored, which is
based on the DIMMs that are plugged
Mirrored memory in use
Available mirrored memory
- Redpaper 1
- Introduction 3
- December 2011 3
- First Edition (December 2011) 4
- Contents 5
- Contents v 7
- Trademarks 10
- The team who wrote this paper 11
- Comments welcome 13
- General description 15
- 1.1 Systems overview 16
- 1.1.2 IBM Power 780 server 17
- 1.2 Operating environment 18
- 1.3 Physical package 19
- 1.4 System features 20
- 1.4.3 Minimum features 24
- 1.4.4 Power supply features 26
- 1.4.7 Memory features 33
- 1.5 Disk and media features 35
- 1.6 I/O drawers 37
- 1.6.3 EXP 12S SAS Drawer 38
- 1.8 Build to Order 40
- 1.9 IBM Editions 40
- 1.10 Model upgrade 40
- Upgrade considerations 41
- 1.12 System racks 43
- Rack Rear View 45
- Circuit breaker reset 45
- Status LED 45
- 1.12.8 Rack-mounting rules 46
- 1.12.9 Useful rack additions 47
- Flat panel display options 49
- Architecture and technical 51
- Memory Controller 53
- 2.1.2 POWER7 processor core 56
- 1997 hardware multi-thread 57
- 2004 2-way SMT 57
- 2010 4-way SMT 57
- 2.1.4 Memory access 58
- Optimized for servers 59
- 2.2 POWER7 processor cards 62
- Power 770 systems 63
- Power 780 systems 63
- Power 780 Systems 64
- 2.2.3 Processor comparison 65
- 2.3 Memory subsystem 66
- I/O Connectors 67
- Each enclosure 70
- 2.3.3 Memory throughput 72
- Processor Chip 73
- 2.4 Capacity on Demand 74
- Figure 2-17 FSP flex cables 80
- 2.6 System bus 82
- 2.7 Internal I/O subsystem 83
- 2.7.1 Blind-swap cassettes 84
- 2.7.2 System ports 84
- 2.8 PCI adapters 85
- • PCIe Expansion riser 86
- • #5802 / 5877 86
- • #5803 / 5873 86
- 2.8.5 LAN adapters 87
- 2.8.7 SCSI and SAS adapters 89
- 2.8.8 iSCSI adapters 90
- 2.8.9 Fibre Channel adapter 91
- 2.8.12 Asynchronous adapter 92
- 2.9 Internal storage 93
- 2.9.2 Triple split backplane 97
- 2.9.4 DVD 98
- 2.10 External I/O subsystems 99
- 2.10.2 12X I/O Drawer PCIe 100
- #5802 12X I/O Drawer 102
- ARECW500-0 103
- ARECW501-0 103
- Four PCIe I/O Drawer 105
- One PCIe I/O Drawer 105
- Two PCIe I/O Drawers 105
- Three PCIe I/O Drawer 105
- 2.11.5 IBM System Storage 113
- IBM XIV Storage System 114
- IBM System Storage DS8000 114
- Server management 115
- Virtualization management 115
- HMC Console management 116
- Management LAN 117
- 2.14.1 Virtual I/O Server 124
- IBM AIX Version 5.3 125
- IBM AIX Version 6.1 125
- IBM AIX Version 7.1 125
- 2.15 Energy management 128
- Virtualization 133
- 3.1 POWER Hypervisor 134
- Virtual SCSI 135
- Virtual Ethernet 135
- 3.2 POWER processor modes 136
- 3.3 Active Memory Expansion 138
- 5.5 true 141
- 3.4 PowerVM 142
- 3.4.1 PowerVM editions 143
- Micro-Partitioning 144
- Processing mode 145
- Dedicated mode 146
- Shared dedicated mode 146
- Shared mode 146
- EC Entitled Capacity 147
- SPPn Shared-Processor Pool 147
- 3.4.4 Virtual I/O Server 151
- Shared Ethernet Adapter 152
- Virtual I/O Server functions 154
- 3.4.6 Active Memory Sharing 157
- Duplication enabled 159
- Signature 160
- Function 160
- 3.5 System Planning Tool 164
- Continuous availability and 167
- 4.1 Reliability 169
- 4.2 Availability 170
- Persistent deallocation 172
- Processor instruction retry 172
- Alternate processor retry 172
- 4.2.3 Memory protection 173
- POWER7 memory subsystem 174
- 32 MB L3 Cache 175
- SMP Fabric 175
- What memory is mirrored 176
- Memory controller 0 177
- Power7 processor 177
- Memory controller 1 177
- Mirroring optimization 179
- DIMM guard at system boot 179
- Repair bits in L1-I 180
- 4.3 Serviceability 183
- Error checkers 186
- Fault isolation registers 186
- First-failure data capture 186
- 4.3.2 Diagnosing 187
- 4.3.3 Reporting 188
- Error logging and analysis 189
- Remote support 189
- Service Focal Point 189
- 4.3.4 Notifying 190
- 4.3.5 Locating and servicing 191
- Light Path 192
- Guiding Light 192
- Service labels 193
- The operator panel 193
- Concurrent maintenance 193
- Blind-swap cassette 194
- Firmware updates 194
- Repair and verify system 195
- 4.4 Manageability 196
- Operating system service menu 199
- Release Lever 199
- Related publications 207
- Online resources 208
- Help from IBM 209
- IBM Power 770 and 780 212
- Technical Overview 212
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