Hp Surestore Disk Array 12h and FC60 Manual de usuario Pagina 49
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Disk Array High Availability Features 49
Product Description
Figure 17
Calculating Data Parity
Data Striping
Data striping, which is used on RAID 0, 0/1, 3 and 5 LUNs, is the performance-enhancing
technique of reading and writing data to uniformly sized segments on all disks in a LUN
simultaneously. Collectively, the segments comprise a stripe of data on the LUN. Data
striping enhances performance by allowing multiple sets of read/write heads to execute the
same I/O transaction simultaneously.
The amount of information simultaneously read from or written to each disk is the stripe
segment size. The stripe segment size is configurable to provide optimum performance
under varying sizes of I/O transactions. Stripe segment size is specified in 512-byte blocks
of data.
Stripe segment size can affect disk array performance. The smaller the stripe segment size,
the more efficient the distribution of data read or written across the stripes in the LUN.
However, if the stripe segment is too small for a single I/O operation, the operation requires
access to two stripes. Called a stripe boundary crossing, this action may negatively impact
performance.
The optimum stripe segment size is the smallest size that will rarely force I/Os to a second
stripe. For example, assume your application uses a typical I/O size of 64
K
B. If you are
1
0
0
1
0
0
0
1
1
1
0
1
0
1
1
1
0
1
0
1
0
1
0
1
1
0
0
0
0
0
=
++ +
+
Data Data Data Data Parity
If this bit is
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This bit will also
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- Advanced User’s Guide 1
- Trademark Information 2
- Safety Notices 2
- Format Conventions 3
- Printing History 3
- Manual Revision History 4
- About This Book 5
- 1 Product Description 7
- 2 Topology and Array Planning 8
- 3Installation 9
- 10 10
- 11 11
- Contents 11
- 5 HP-UX Diagnostic Tools 12
- 6 Troubleshooting 13
- 7 Removal and Replacement 13
- 14 14
- 15 15
- 16 16
- 1 PRODUCT DESCRIPTION 17
- Product Description 18
- Figure 1 19
- SureStore E 19
- Disk System SC10 19
- Array Controller FC60 19
- Operating System Support 20
- Management Tools 20
- Features 20
- High Availability 21
- Scalable Storage Capacity 21
- LED Status Monitoring 22
- Disk Enclosure Components 23
- Figure 2 24
- Operation Features 25
- Power Switch 26
- Disk Enclosure SC10 Modules 27
- Power Supplies 32
- Figure 9 36
- Front Cover 37
- Controller Modules 38
- Controller Module LEDs 39
- Controller Fan Modules 40
- Figure 13 41
- Power Supply Modules 42
- Power Supply Fan Module 43
- Figure 15 44
- Battery Backup Unit 45
- RAID Technology 47
- Disk Mirroring 47
- Data Parity 48
- Data Striping 49
- RAID Levels 50
- RAID 0/1 52
- RAID Level Comparisons 57
- Table 2 58
- Table 3 58
- Table 4 59
- Table 5 60
- Global Hot Spare Disks 61
- Figure 23 63
- Capacity Management Features 65
- Disk Array Caching 66
- Dynamic Capacity Expansion 67
- 2 TOPOLOGY AND ARRAY PLANNING 69
- Array Design Considerations 71
- Performance 73
- Storage Capacity 75
- Expanding Storage Capacity 75
- Configuration Considerations 77
- Figure 25 81
- Maximum Capacity 82
- Figure 26 83
- Figure 27 85
- Figure 28 87
- Figure 29 89
- Figure 30 91
- Figure 31 93
- Figure 32 95
- Figure 33 97
- Figure 34 99
- Total Disk Array Capacity 100
- Table 6 101
- Table 7 101
- Topologies for HP-UX 102
- Basic Topology 103
- Topology and Array 105
- Planning 105
- Figure 37 107
- Table 8 108
- Figure 38 112
- Table 9 113
- High Availability Topology 115
- Figure 39 117
- Table 10 118
- Figure 40 122
- Table 11 123
- Campus Topology 125
- Figure 41 126
- Table 12 127
- Figure 43 130
- Unsupported Windows Topology 132
- Characteristics 133
- Figure 45 134
- Figure 46 135
- Figure 47 136
- High Availability Topologies 137
- Figure 48 138
- Figure 49 139
- Figure 50 140
- Figure 51 141
- 3INSTALLATION 143
- Overview 144
- Host System Requirements 145
- Windows NT and Windows 2000 146
- Site Requirements 147
- Installing PDUs 152
- Recommended UPS Models 152
- Figure 52 153
- Figure 53 154
- Installation 155
- Figure 54 158
- Figure 55 159
- Step 2: Unpack the Product 160
- Figure 56 161
- Figure 57 163
- Door Lock 164
- Installing the Controller 170
- Table 23 171
- Figure 62 172
- Figure 63 174
- Configuration Switches 176
- Table 26 182
- Attaching Power Cords 183
- Figure 66 185
- Figure 67 186
- Attaching SCSI Cables and 187
- Figure 69 190
- Figure 71 193
- SCSI terminators 193
- Bus Addressing Examples 194
- Figure 73 195
- This disk is on 195
- Table 27 201
- Figure 77 202
- Figure 78 204
- Powering Down the Array 205
- On HP-UX 206
- 8/12.8.0.255.1.2.0 208
- 8/12.8.0.6.0.1.3 209
- 8/12.8.0.0.0.3.5 211
- (3 x 8) + (5) = 29 212
- System Requirements 213
- Configuring the Disk Array 216
- Step 5. Replace LUN 0 218
- Step 8. Bind LUNs 219
- Capacity Expansion Example 232
- Figure 84 235
- Array Manager 60 238
- Table 30 239
- AM60Srvr Daemon 241
- Running Array Manager 60 241
- Managing Disk Array Capacity 242
- Selecting Disks for a LUN 243
- Increasing LUN Capacity 245
- Selecting a RAID Level 247
- Global Hot Spares 248
- Evaluating Performance Impact 250
- Cache page size 252
- Start data flushing 253
- Stop data flushing 253
- Initial cache settings 253
- Adding More Disk Modules 254
- Managing the Disk Array 255
- Table 32 259
- Checking Disk Array Status 261
- Locating Disk Modules 265
- Binding a LUN 267
- Unbinding a LUN 271
- Replacing a LUN 271
- Adding a Global Hot Spare 273
- Unassigned 274
- Removing a Global Hot Spare 275
- Table 33 277
- Table 34 278
- Command Syntax Conventions 279
- Array Manager 60 man pages 279
- Quick Help 279
- Figure 88 284
- Listing Disk Array IDs 288
- Rescanning for Disk Arrays 288
- Managing LUNs 289
- Identifying Disks 292
- Calculating LUN Capacity 292
- Managing Global Hot Spares 295
- Managing Cache Parameters 299
- Setting Cache Page Size 300
- Setting the Cache Flush Limit 301
- Managing the Rebuild Process 305
- Checking Rebuild Progress 305
- Performing a Parity Scan 306
- Managing Disk Array Logs 307
- Sample Log Entries 310
- Purging Controller Logs 311
- Resetting Battery Age 312
- Installing Updated Patches 312
- Upgrading Disk Firmware 313
- LUN Status Conditions 317
- Table 40 318
- Disk Status Conditions 319
- Table 41 320
- Component Status Conditions 321
- FRU Codes 322
- Table 43 323
- 0 x n n n n 324
- 76543 21 0 324
- SCSI Sense Codes 327
- Table 44 328
- 5 HP-UX DIAGNOSTIC TOOLS 345
- Support Tools Manager 347
- HP-UX Diagnostic Tools 349
- Figure 90 350
- STM Tools 351
- Using the STM Expert Tool 355
- Table 46 357
- 6 TROUBLESHOOTING 359
- Introduction 360
- Table 47 361
- HP-UX Troubleshooting Tools 362
- Sample EMS Event Message 363
- Figure 91 364
- Troubleshooting 365
- Power-Up Troubleshooting 366
- Controller Enclosure LEDs 368
- Master Troubleshooting Table 370
- Disk Enclosure LEDs 376
- Losing LUN 0 376
- Figure 93 377
- Table 50 377
- Disk Enclosure LED Functions 377
- Isolating Causes 380
- Table 52 382
- 7 REMOVAL AND REPLACEMENT 383
- Overview 385 385
- Removal and 385
- Replacement 385
- Disk Enclosure Modules 386
- Installing 388
- Figure 96 391
- Disk Enclosure Fan Module 392
- Installing the Fan Module 393
- Hot Swappable Component! 394
- 395
- Removing the Front Cover 397
- Controller Fan Module 398
- Removing the BBU 400
- Figure 101 401
- Installing the BBU 402
- SCSI Cables 407
- Fibre Channel Host Adapters 411
- Models and Options 412
- Table 54 413
- Table 58 416
- PDU/PDRU Products 417
- Replaceable Parts 418
- Table 61 419
- Dimensions: 420
- Weight: 420
- AC Power: 421
- Heat Output: 421
- Environmental Specifications 422
- Acoustics 423
- Weight: 424
- DC Power Output: 425
- Limitation of Warranty 429
- Reference / Legal / 431
- Regulatory 431
- Regulatory Compliance 434
- FCC Statements (USA Only) 435
- VCCI Statement (Japan) 436
- Harmonics Conformance (Japan) 436
- Declaration of Conformity 439
- GLOSSARY 441
- 442 442
- 443 443
- Glossary 443
- 444 444
- 445 445
- 446 446
- 447 447
- 448 448
- 449 449
- 450 450
- 451 451
- 452 452
- 453 453
- 454 454
- See disk array 456
- See BCC module 456
- See battery backup module 456
- See cstm 457
- See disk modules 458
- See disk module 458
- See disk enclosure 458
- See EMS 460
- See global hot spare 460
- See Fibre Channel host ID 461
- See mstm 461
- See disk 464
- See xstm 465
- 466 Index 466
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