Compaq External RAID Controller & Subsystem Manual do Utilizador Página 36
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Functional Description
1-14
minimized to reduce the possibility of having two drives to fail at
the same time.
Configuration A is a large logical drive and takes a long time to
rebuild. All members will be involved during the rebuild process.
In Configuration B, the time span is shorter because only 6 members
will participate when rebuilding any of the logical drives.
c) Channel Failure Protection: Channel failure may sometimes
result from absurd matters like a cable failure. A channel failure
will cause multiple drives to fail at the same time and inevitably
lead to a fatal failure. Using a logical volume with drives coming
from different drive channels can get around this point of failure.
Figure 1 - 18 Logical Volume with Drives on Different
Channels
Logical Volume
24 drives, 4 redundancy drive
Configuration C - One logical volume with 4 logical drives
Logical
Volume
RAID 5
Logical
Drive
RAID 5
Logical
Drive
RAID 5
Logical
Drive
RAID 5
Logical
Drive
CH1
CH1/ID0
CH1/ID1
CH1/ID2
CH1/ID3
CH3
CH3/ID0
CH3/ID1
CH3/ID2
CH3/ID3
CH4
CH4/ID0
CH4/ID1
CH4/ID2
CH4/ID3
CH5
CH5/ID0
CH5/ID1
CH5/ID2
CH5/ID3
CH2
CH2/ID0
CH2/ID1
CH2/ID2
CH2/ID3
CH6
CH6/ID0
CH6/ID1
CH6/ID2
CH6/ID3
As illustrated above, should one of the drive channels fail, each
logical drive loses one of its members. Logical drives still have the
chance to rebuild its members. Data remains intact and the rebuild
can be performed after the failed channel is recovered. No access
interruptions to the logical volume will be experienced from the host
side.
Spare drives assigned to a logical volume?
A Local Spare can not be assigned to a Logical Volume. If a drive
fails, it fails as a member of a logical drive; therefore, the controller
allows Local Spare's assignment to logical drives rather than logical
volumes.
- 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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