Compaq External RAID Controller & Subsystem Manual de usuario Pagina 190
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Valorado. / 5. Basado en revisión del cliente
Infortrend
9-5
9.1.2 S.M.A.R.T. (Self-Monitoring, Analysis
and Reporting Technology )
This section provides a brief introduction to S.M.A.R.T. as one way
to predict drive failure and Infortrend’s implementations with
S.M.A.R.T. for preventing data loss caused by drive failure.
A. Introduction
Self-Monitoring, Analysis and Reporting Technology (S.M.A.R.T.) is
an emerging technology that provides near-term failure prediction
for disk drives. When S.M.A.R.T. is enabled, the drive monitors
predetermined drive attributes that are susceptible to degradation
over time.
If a failure is likely to occur, S.M.A.R.T. makes a status report
available so that the host can prompt the user to back up data on the
failing drive. However, not all failures can be predicted. S.M.A.R.T.
predictability is limited to the attributes the drive can monitor which
are selected by the device manufacturer based on the attribute’s
ability to contribute to the prediction of degrading or fault
conditions.
Although attributes are drive specific, a variety of typical
characteristics can be identified:
• head flying height
• data throughput performance
• spin-up time
• re-allocated sector count
• seek error rate
• seek time performance
• spin try recount
• drive calibration retry count
Drives with reliability prediction capability only communicate a
reliability condition as either good or failing. In a SCSI
environment, the failure decision occurs at the disk drive, and the
host notifies the user for action. The SCSI specification provides a
sense bit to be flagged if the disk drive determines that a reliability
issue exists. The system then alerts the user/system administrator.
B. Infortrend's Implementations with S.M.A.R.T.
Infortrend is using ANSI-SCSI Informational Exception Control
(IEC) document X3T10/94-190 standard.
- Infortrend 1
- Generic Operation Manual 1
- Asia Pacific 2
- Americas 2
- Printed in Taiwan 3
- Table of Contents 4
- Chapter 7 Terminal Operation 7
- Chapter 8 Fibre Operation 8
- Chapter 12 Array Expansion 11
- Appendix D Event Messages 12
- Functional Table of Contents 13
- Chapter 8 Fibre Operation 15
- Chapter 12 Array Expansion 16
- Upgrading Firmware 17
- List of Tables 18
- List of Figures 18
- About This Manual 20
- Revision History: 21
- RAID Functions: 23
- An Introduction 23
- 1.3 RAID Levels 24
- Figure 1 - 2 NRAID 25
- Figure 1 - 3 JBOD 25
- RAID (0+1) 26
- 1.4 Spare Drives 28
- A Local Spare always has 29
- Global Spare 29
- 1.5 Identifying Drives 30
- 1.6 Rebuild 31
- 2. Manual Rebuild 32
- What is a logical volume? 34
- RAID 5 Logical Drive 35
- 24 drives, 1 redundancy drive 35
- Logical Volume 36
- 24 drives, 4 redundancy drive 36
- Multi-level RAID systems 39
- RAID (3+0) 39
- RAID (5+0) 39
- RAID Planning 40
- Optimization Mode 42
- 7. What RAID level? 42
- 8. Any spare drives? 43
- 9. Limitations? 43
- Configuring the Array: 44
- 2.3 Operation Theory 46
- 2.4 Tunable Parameters 49
- Accessing the Array 52
- Ethernet 52
- 3.2 Out-of-Band via Ethernet 55
- Other Concerns 56
- Requirements 56
- 5. Starting the Manager: 59
- 3.2.3 NPC Onboard 60
- The SNMP_TRAP section 61
- The EMAIL section 61
- The BROADCAST section 61
- LCD Screen Messages 62
- 4.3 Logical Drive Status 63
- 4.4 Logical Volume Status 64
- 4.5 SCSI Drive Status 65
- CH0=Host = 66
- 4.8 Cache Dirty Percentage 68
- 4.9 View and Edit Event Logs 68
- LCD Keypad Operation 69
- 5.3 View Connected Drives: 73
- 5.4 Creating a Logical Drive 74
- Spare Drive Assignments: 75
- Disk Reserved Space: 75
- Write Policy: 75
- Initialization Mode: 75
- Stripe Size: 76
- Beginning Initialization 76
- 5.5 Creating a Logical Volume 78
- Logical Volume Assignment 79
- Drive to Host LUN 81
- Adding a Global Spare Drive 83
- Rebuild Settings 83
- Scanning New SCSI Drive 91
- Identifying a Drive 92
- Viewing IDs 94
- Adding a Channel ID 94
- Deleting a Channel ID 95
- Setting Transfer Speed 97
- Setting Transfer Width 98
- Parity Check 100
- Disconnecting Support 100
- Maximum Tag Count 100
- IMPORTANT! 101
- Restore to Default Setting 101
- 5.13 System Functions 102
- Reset Controller 103
- Shutdown Controller 103
- Disabling Password 103
- Controller Maintenance 104
- Saving NVRAM to Disks 104
- Restore NVRAM from Disks 104
- 5.14 Controller Parameters 105
- Controller Date and Time 106
- Time Zone 106
- Date and Time 107
- 5.15 SCSI Drive Utilities 108
- SCSI Drive Read/Write Test 109
- Terminal Screen Messages 110
- 6.2 Main Menu 111
- 6.3 Quick Installation 111
- 6.4 Logical Drive Status 113
- 6.5 Logical Volume Status 114
- 6.6 SCSI Drive Status 115
- 6.7 SCSI Channel’s Status 116
- CurSynClk 117
- Terminal Operation 120
- Limitations: 121
- 7.4 Creating a Logical Drive 124
- Choosing a RAID Level: 125
- Choosing Member Drives: 125
- Logical Drive Preferences: 125
- Maximum Drive Capacity: 125
- Assign Spare Drives: 126
- Disk Reserved Space 126
- Logical Drive Assignments: 126
- Write Policy 126
- Initialization Mode 127
- Stripe Size 127
- 7.5 Creating a Logical Volume 129
- WARNING! 131
- Settings 134
- Drive Members 135
- Partition 1 136
- Rebuilding a Logical Drive 137
- Media Scan 138
- Edit Host-ID/WWN Name List 140
- Pass-through SCSI Commands 140
- Scanning New Drive 141
- Slot Number 142
- Drive Entry 142
- Identifying Drive 142
- Redefining Channel Mode 144
- Viewing and Editing SCSI IDs 145
- Deleting an ID 146
- Setting Channel Terminator 147
- Setting a Transfer Speed 147
- Setting the Transfer Width 148
- Maximum Transfer Width 150
- Data Rate 151
- 7.13 System Functions 153
- Changing the Password 154
- Setting a New Password 154
- Disabling the Password 155
- 7.14 Controller Parameters 156
- Password Validation Timeout 158
- Controller Unique Identifier 158
- Set Controller Date and Time 160
- 7.15 Drive Information 161
- SCSI Drive Low-level Format 162
- Fibre Operation 164
- 8.2 Major Concerns 165
- 8.3 Supported Features 167
- Drive IDs: 168
- Parameters 169
- (RCC Channel): 170
- View Channel WWN 170
- View and Edit Fibre Drive 171
- View Drive Information 172
- 2. Drive-Side Dual Loop: 173
- Filtering 177
- Creating LUN Masks 178
- WWN Name List 179
- Sample Configuration: 183
- Configuration Procedure: 184
- Advanced Configurations 186
- 9.1.1 Clone Failing Drive: 187
- Perpetual Clone: 188
- A. Introduction 190
- Disable: 191
- Detect Only: 191
- Clone + Replace: 191
- Configuration Procedure 192
- Using S.M.A.R.T. Functions 193
- Connection: 197
- Maximum Queued I/O Count: 198
- LUNs per Host SCSI ID 198
- LUN Applicability: 198
- Peripheral Device Type: 199
- In-band (SCSI or Fibre): 199
- Operating Systems: 200
- 9.2.2 Drive-side Parameters: 203
- SCSI Motor Spin-Up 203
- SCSI Reset at Power-Up 204
- Disk Access Delay Time 205
- SCSI I/O Timeout 205
- Periodic Drive Check Time 207
- Idle Drive Failure Detection 208
- Dynamic Switch Write-Policy 210
- 9.4 Disk Array Parameters 212
- Verification on Writes 213
- Redundant Controller 214
- 10.1.1 Setup Flowchart 215
- Connection 215
- Fibre-Based Controllers 216
- Primary and Secondary IDs 219
- 10.1.4 Fault-Tolerance 221
- A.Channel Bus 222
- Replacing a Failed Unit: 224
- Auto-Failback: 224
- E. Controller Failure 226
- 10.2 Preparing Controllers 227
- Controller Settings: 228
- 10.2.2 Limitations 229
- Cache Synchronization 230
- Battery Support 230
- Infortrend10-18 231
- 10.3 Configuration 232
- 10.3.1 Via Front Panel Keypad 233
- 2. Controller Unique ID 234
- Drive Channel 235
- Controller 236
- Secondary 238
- Controller Replaced? 244
- Channel) 247
- Secondary Controller RS-232 247
- Remote Redundant Controller 247
- Record of Settings 248
- Partition Information 249
- Logical Volume Information 250
- 11.3 View and Edit Host LUN’s 251
- Host Filter Entries 252
- Caching Parameters 256
- Host Side SCSI Parameters 256
- Drive Side SCSI Parameters 256
- 11.9 RAID Security: Password 259
- Array Expansion 260
- Note on Expansion 261
- 12.2 Mode 1 Expansion: 263
- 12.3 Mode 2 Expansion: 266
- Larger Capacity 266
- Expand Logical Drive 268
- 12.5 Expand Logical Volume 270
- Volume Extension in 271
- Windows 2000 271
- LCD Keypad Navigation Map 277
- View & Edit 278
- Navigation Map 279
- Firmware Functionality 284
- Specifications 284
- Advanced Features: 285
- Caching Operation: 286
- RAID Expansion: 287
- Fibre Channel Support: 288
- S.M.A.R.T. Support: 289
- Redundant Controller: 289
- Data Safety: 290
- System Security: 291
- Environment Management: 292
- User Interface: 293
- Remote Manageability: 293
- JBOD-Specific: 294
- System Functions: 295
- RAIDWatch Manager 296
- Emulation 298
- Event Messages 301
- Logical Drive Event 303
- General Target Events 303
- Controller Event 307
- Logical Drive Event: 317
- General Target Events: 322
- IndexIndex 340
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