Hp Surestore Disk Array 12h and FC60 Manuel d'utilisateur Page 59
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Disk Array High Availability Features 59
Product Description
Table 4
RAID Level Comparison: General Performance Characteristics
RAID Level General Performance Characteristics
RAID 0 – Simultaneous access to multiple disks increases I/O performance. In
general, the greater the number of mirrored pairs, the greater the increase
in performance.
RAID 1 – A RAID 1 mirrored pair requires one I/O operation for a read and two I/O
operations for a write, one to each disk in the pair.
– The disks in a RAID 1 mirrored pair are locked in synchronization, but the
disk array can read data from the module whose read/write heads are the
closest.
– RAID 1 read performance can be twice that of an individual disk. Write
performance can be the same as that of an individual disk.
RAID 0/1 – Simultaneous access to multiple mirrored pairs increases I/O performance.
In general, the greater the number of mirrored pairs, the greater the
increase in performance.
RAID 3 – Provides high read throughput for large sequential I/Os.
– Write performance is limited by the need to perform four I/O operations per
write request.
– Because some I/O operations occur simultaneously, performance depends
on the number of disks in the LUN. Additional disks may improve
performance.
– The I/O performance of RAID 5 benefits significantly from write caching.
RAID 5 – Provides high read throughput for small block-size requests (2 KB to 8 KB).
– Write performance is limited by the need to perform four I/O operations per
write request.
– Because some I/O operations occur simultaneously, performance depends
on the number of disks in the LUN. Additional disks may improve
performance.
– The I/O performance of RAID 5 benefits significantly from write caching.
- 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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