Intel AS/400 RISC Server Manuel d'utilisateur Page 237
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
14.6.2.4 Virtual SCSI Bandwidth-Disk Scaling
Figure 4 shows a comparison of measured bandwidth while scaling disk drives with varying
block sizes of operations. Each of the network storage descriptions have a single network storage
space attached to them. The difference in the scaling of these tests is attributable to the
performance gain which can be achieved by adding disk drives and IO adapters. The figures
below include small (4k-64k) transactions and larger (128k) transactions.
Read Performance-Small Transactions
0
50
10 0
15 0
200
250
300
15 Disk 30 Disk 45 Disk
Disk
1 N W S D
2 NWSD
4 NWSD
8 NWSD
16 N W SD
24 NWSD
Write Performance-Small Transactions
0
50
10 0
15 0
200
250
15 Disk 30 Disk 45 Disk
Disk
1 N W S D
2 NWSD
4 NWSD
8 NWSD
16 N W SD
24 NWSD
Read Performance - Large
Transactions
0
200
400
600
15 Disk 30 Disk 45 Disk
Disk
1 N W S D
2 NWSD
4 NWSD
8 NWSD
16 N W SD
24 NWSD
Write Performance-Large Transactions
0
50
10 0
15 0
200
250
300
15 Disk 30 Disk 45 Disk
Disk
1 N W S D
2 NWSD
4 NWSD
8 NWSD
16 N W SD
24 NWSD
Figure 4 The figures above show read and write performance for small (4k-64k) and large transactions (128k+). This
experiment shows that adding disk drives increases the throughput. A system with 45 disk drives will be able to transfer
approximately 3 times faster then a system with 15 disk drives. Notice 24-network storage descriptions were used in order
to achieve maximum performance.
IBM i 6.1 Performance Capabilities Reference - January/April/October 2008
© Copyright IBM Corp. 2008 Chapter 14 DASD Performance 237
- 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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