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Appendix D 355
Using SNAplus2 in a High Availability Environment
What is High Availability?
What is High Availability?
High availability is a term used to describe an environment in which
mission critical applications are protected from severe impact of various
failures . These failures might include entire computer system failures,
network failures, software failures, power failures, disk drive failures,
and I/O interface failures. If the result of any one failure is the complete
loss of the mission critical application, then a single point of failure
exists. The main goal of high availability is to achieve maximum uptime.
High availability networks should have sufficient redundancy of
software and hardware components so that a single point of failure will
not disrupt service.
To see what types of failures are considered important, look at the
following example of a typical SNAplus2 client/server network that is not
designed for high availability.
- HP-UX SNAplus2 1
- Administration Guide 1
- Legal Notices 2
- Contents 10
- Prerequisite Knowledge 15
- About This Book 15
- Organization of This Book 15
- Typographic Conventions 17
- Operating System Conventions 18
- SNAplus2 Publications 18
- Publications for Users 18
- Publications for Programmers 20
- Related Publications 21
- 1 SNA Terms and Concepts 23
- Systems Network Architecture 25
- Basic SNA Concepts 26
- Connectivity 30
- Transaction Programs 31
- Network Accessible Units 32
- Logical Units 33
- Control Points 35
- Sessions 36
- Conversations 39
- Route Selection 41
- Class of Service 42
- Basic APPN Concepts 43
- APPN Network Nodes 45
- APPN End Nodes 45
- LEN Nodes 46
- APPN Control Point 47
- Locating Resources 48
- Session Routing 53
- Intermediate Routing 57
- Direct Connectivity 58
- APPN Connection Networks 60
- APPN Networks 64
- 2 Introduction to SNAplus2 65
- What Is SNAplus2? 67
- Example Configurations 69
- SNAplus2 Components 74
- Node Components 75
- User Applications 79
- 5250 Emulation 80
- RJE Workstation Daemon 80
- APPC API 82
- CPI-C API 83
- Windows APIs 84
- Client/Server Support 85
- HP-UX Clients 88
- Windows Clients 89
- SNAplus2 Resources 90
- Connectivity Resources 91
- Link Stations 92
- Session Resources 94
- Modes and Classes of Service 96
- Directory Information 96
- Domain Resources 97
- SNAplus2 Administration 98
- Administration Tools 99
- Remote Command Facility 102
- Configuration Files 102
- NOF Applications 104
- Diagnostic Tools 105
- 3 Administering SNAplus2 107
- Overview 108
- Planning Worksheets 109
- Task Sheets 110
- Local System 111
- Enabling SNAplus2 Servers 112
- Disabling SNAplus2 Servers 113
- Resource Windows 116
- Domain Window 117
- Node Window 119
- Resource Items 122
- Tool Bar Buttons 123
- Resource Dialogs 124
- Status Dialogs 126
- Help Windows 127
- ASCII Administration Program 129
- Using the Command-Line 130
- Administration Program 130
- 132 Chapter 3 132
- Administering SNAplus2 132
- 4 Basic Configuration Tasks 133
- Configuring the Node 137
- Additional Configuration 138
- Configuring Logging 139
- 142 Chapter 4 142
- Basic Configuration Tasks 142
- 5 Defining Connectivity 143
- Components 143
- 146 Chapter 5 146
- Defining Ports, DLCs, and 147
- Connection Networks 147
- Configuration Parameters 148
- Ethernet 152
- Defining Link Stations 154
- Defining DLUR PUs 164
- 6 Configuring Dependent LUs 167
- Defining LU Types 0–3 169
- Defining LU Pools 172
- 174 Chapter 6 174
- Configuring Dependent LUs 174
- 7 Configuring APPC 175
- Communication 175
- Defining Local LUs 178
- Defining Remote Nodes 181
- Defining Partner LUs 183
- Defining TPs 187
- TP Invocation Parameters 189
- TP Definition Parameters 192
- Mode Configuration Parameters 196
- CPI-C Configuration Parameters 200
- Configuring APPC Security 204
- 208 Chapter 7 208
- Configuring APPC Communication 208
- Configuring 3270 Sessions 216
- Configuring 5250 Users 218
- Configuring RJE Workstations 220
- 222 Chapter 8 222
- Configuring User Applications 222
- 9 Configuring Passthrough 223
- Services 223
- Configuring TN Server 225
- Parameters 229
- Configuring PU Concentration 230
- Configuring DLUR 233
- 10 Managing SNAplus2 from 235
- NetView Screen Display 238
- Using SPCF 241
- Examples of SPCF Commands 242
- Using UCF 243
- Permitted Commands 244
- Example of a UCF Command 245
- Canceling a Command 246
- UCF Security 247
- 248 Chapter 10 248
- 11 Managing SNAplus2 Clients 249
- Setting Up IP Port Numbers 251
- LAN Access Timeout 252
- Defining Client TPs 253
- Managing Win32 Clients 254
- Enabling a Win32 Client 255
- Win32 Client Security 256
- Win32 Client Configuration 257
- Configuration 258
- API_tracing 267
- MSG_tracing 270
- CS_tracing 271
- Appl_Name 273
- CSV_data 274
- Managing Win16 Clients 275
- Enabling a Win16 Client 276
- Win16 Client Security 277
- [Configuration] 280
- [Servers] 283
- [Logging] 284
- [API_tracing] 288
- [MSG_tracing] 290
- [CS_tracing] 292
- [Appl_Name] 293
- [CSV_data] 294
- Managing HP-UX Clients 295
- (sna_clnt.net) 296
- 300 Chapter 11 300
- Managing SNAplus2 Clients 300
- A Configuration Planning 301
- Worksheets 301
- Node Worksheets 303
- LEN Node 304
- Connectivity Worksheets 306
- Token Ring 310
- QLLC (X.25) 318
- PU Concentration 323
- TN Server 324
- B APPN Network Management 337
- Using the Simple Network 337
- Management Protocol 337
- Introduction to SNMP 339
- SNAplus2 APPN SNMP Subagent 341
- C Configuring an Invokable TP 343
- Using snaptpinstall 343
- File Format for snaptpinstall 345
- D Using SNAplus2 in a High 353
- Availability Environment 353
- What is High Availability? 355
- Client/server network link 356
- SNAplus2 Link software 356
- SNA network link 356
- Disk Drives 356
- Client/Server Configuration 359
- SNAplus2 Package 368
- Standby LAN adapter 372
- SNA LAN Connections 373
- TN Server LAN Connections 374
- Modifying the PATH variable 376
- snap stop 377
- I/O Compatibility Constraints 378
- Primary HP-UX Server hp_pri 379
- Token Ring Adapter 379
- Backup HP-UX Server hp_back 379
- Card 0Card 0 379
- Backup DLC 382
- Primary DLC 382
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