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14.1.3 571B
iV5R4 offers two new options on DASD configuration.
y RAID6 which offers improved system protection on supported IOAs.
y NOTE: RAID6 is supported under iV5R3 but we have chosen to look at performance data on
a iV5R4 system.
y IOPLess operation on supported IOAs.
14.1.3.1 571B RAID5 vs RAID6 - 10 15K 35GB DASD
14.1.3.2 571B IOP vs IOPLESS - 10 15K 35GB DASD
The system CPU % used with and without and IOP was basically the same for the 571B with our
workload tests.
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008 Chapter 14 DASD Performance 194
RAID-5 vs RAID-6 .
0
0.05
0.1
0.15
0.2
0.25
0 500 1000 1500 2000 2500 3000 3500
Workload Throughput
System Responce Time
(sec)
571B RAID-5 571B RAID-6
IOP vs IOPLess
0
0.05
0.1
0.15
0.2
0.25
0 500 1000 1500 2000 2500 3000 3500
Workload Throughput
System Responce Time
(sec)
571B RAID-5 IOP 571B RAID-5 IOPLess
- IBM Power Systems 1
- Table of Contents 3
- Special Notices 10
- IBM Corporation 11
- Purpose of this Document 12
- Chapter 1. Introduction 13
- 2.1 Overview 15
- 2.2 Server Model Behavior 17
- 2.2.1 In V4R5 - V5R2 17
- 2.2.3 Existing Older Models 18
- Fraction of Interactive CPW 19
- Available CPU % 19
- Custom Server Model 21
- Model 7xx and 9/98 Model 170 22
- CPW Values 24
- 2.8 Interactive Utilization 25
- Server Dynamic Tuning - 28
- Server Dynamic Tuning 28
- Chapter 3. Batch Performance 39
- 4.1 New for i5/OS V6R1 42
- 4.2 DB2 i5/OS V5R4 Highlights 44
- 4.3 i5/OS V5R3 Highlights 46
- 4.5 Indexing 52
- 4.10 Referential Integrity 58
- manual and the redbook 58
- 4.11 Triggers 58
- 4.12 Variable Length Fields 59
- Table 5.9 76
- 5.9 Additional Information 77
- Relative Capacity 81
- Non-Secure Secure 81
- IFS Local Cache FRCA 83
- 6.2 PHP - Zend Core for i 88
- +68% +78% 93
- Capacity 99
- Trade on System i 100
- WebSphere Trade 3 Primitives 102
- 6.4 IBM WebFacing 107
- Version 5.0 of Webfacing 108
- Webfacing - Compression 114
- HATS Customization (CPW/User) 118
- 6.7 WebSphere Portal 121
- 6.8 WebSphere Commerce 121
- 6.10 Connect for iSeries 122
- Connect for iSeries 123
- Connector Types 123
- Chapter 7. Java Performance 125
- 7.4 Classic VM (64-bit) 128
- 7.6 Capacity Planning 134
- Resources 141
- 8.6 Additional Information 148
- Measurement Results: 150
- Conclusion/Explanations: 150
- NetServer 151
- Chapter 11. Domino on i 157
- ), March 2004 158
- , February 2003 158
- 11.2 Domino 8 159
- 11.3 Domino 7 159
- 11.4 Domino 6 160
- 11.8 Domino Web Access 167
- 11.9 Domino Subsystem Tuning 167
- 11.11 Main Storage Options 168
- Thousands 170
- 12.1 Introduction 174
- Other Sources of Information 176
- 13.1 Summary 177
- Fraction of ILE Performance 182
- Chapter 14. DASD Performance 190
- 14.1.0 Direct Attach (Native) 191
- & Controllers 191
- 14.1.2.1 192
- I/O Intensive Workload 193
- 14.1.9.1 203
- 14.1.9.2 203
- 14.2 New in iV5R4M5 205
- 14.2.2 RAID Hot Spare 206
- 14.3 New in iV6R1M0 208
- 14.3.1 Encrypted ASP 208
- Workload Throughput 210
- System Response Time (sec) 210
- System Response Time (sec 211
- DS4800 (90 DDMs) 223
- Average DASD Response 226
- Time (Seconds) 226
- 15 Disk 5GB Sequential Write 235
- NWSD Read Scaling 236
- Read Performance - Large 237
- Transactions 237
- 15 Disk 1GB Sequential Read 241
- 15.3 Workloads 245
- Save and Restore Rates 250
- 520 2 way 16GB Memory 60 Dasd 253
- 520 2 way 16GB Memory 254
- 15.12 Virtual Tape 255
- 1000 Empty Libraries 256
- 15.13 Parallel Virtual Tapes 257
- DASD and writing to tape 258
- (SAVE) Write to Virtual tape 259
- User Mix Virtual Tape Scaling 259
- (SAVE) Write to Virtual Tape 259
- Large File Restore 260
- User Mix Restores 261
- 15.19 5XX Tape Device Rates 265
- 15.22 Software Compression 269
- 15.23 9406-MMA DVD RAM 270
- Chapter 16 IPL Performance 273
- 16.6 NOTES on MSD 276
- 16.11 IPL Tips 279
- 17.1 Introduction 280
- CPW per 1k Disk Operations 287
- MB per Second 288
- . This is 289
- VEPhyp Stream TCP 290
- . The target tape 291
- FLBU SAV / RST Rates 292
- 18.1 Introduction 294
- 18.2 Considerations 295
- 5% increase 3% decrease 296
- LPAR Throughput Increase 298
- 18.4 LPAR Measurements 299
- 18.5 Summary 300
- Standard 302
- Number of PC Clients 311
- Total Collection Time (min) 311
- HSL Line 327
- 870 Cluster HSL Cabling Map 327
- System ASP 327
- 6:5510:194:31Time(Minutes) 328
- Workload Description 329
- Cabling Map 330
- Hardware Configuration 330
- Geographic Mirroring Tips 332
- 22.1 Overview 333
- All of the 340
- All of these 340
- - IBM i operating system 345
- IBM ~® i5 Servers 350
- C.9 V5R2 Additions 353
- C.10 V5R1 Additions 354
- C.10.1 Model 8xx Servers 355
- C.10.2 Model 2xx Servers 356
- C.11 V4R5 Additions 359
- C.11.2 Model 2xx Servers 360
- C.11.4 SB Models 361
- C.12 V4R4 Additions 361
- C.12.2 Model 170 Servers 362
- Current 170 Servers 362
- Previous Model 170 Servers 363
- C.14 AS/400e Custom Servers 364
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