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Introduction to RAID 39
Rebuilding can be done only in arrays with data redundancy, which includes
as RAID 1, 5, 10 and 50.
A hot spare can be used to rebuild disk drives in RAID 1, 5, 10, or 50
systems. If a hot spare is not available, the failed disk drive must be replaced
with a new disk drive so that the data on the failed drive can be rebuilt.
Using hot spares, PERC 3 can automatically and transparently rebuild failed
drives with user-defined rebuild rates. If a hot spare is available, the rebuild
can start automatically when a drive fails. PERC 3 automatically restarts the
system and the rebuild if the system goes down during a rebuild.
Rebuild Rate
The rebuild rate is the percentage of the compute cycles dedicated to
rebuilding failed drives. A rebuild rate of 100 percent means the system is
totally dedicated to rebuilding the failed drive.
The PERC 3 rebuild rate can be configured between 0% and 100%. At 0%,
the rebuild is done only if the system is not doing anything else. At 100%,
the rebuild has a higher priority than any other system activity. The default
rebuild rate is 30%.
Hot Swap
A hot swap is the manual replacement of a defective physical disk unit while
the computer is still running. When a new drive has been installed, a
rebuild will occur automatically if it is placed in the same drive bay as the
failed drive it is replacing. PERC 3 can be configured to detect the new disks
and to rebuild the contents of the disk drive automatically.
SCSI Drive States
The SCSI drive states are listed in Table 2-3.
Table 2-3. SCSI Drive States
State Description
Online
(ONLIN)
The drive is working normally and is a part of a configured
logical drive.
- PERC 3 User’s Guide 1
- ____________________ 2
- Safety Instructions 3
- When Using Your Computer 4
- Ergonomic Computing Habits 7
- Battery Disposal 7
- Contents 9
- 3 RAID Levels 10
- 4 PERC 3/SC Features 10
- 6 PERC 3/QC Features 12
- 7 Configuring PERC 3 12
- 12 Dell Manager 16
- 13 Troubleshooting 17
- 16 Contents 18
- 18 Figures 20
- PERC 3 Overview 26
- PERC 3 Features 26
- SCSI Channels 27
- SCSI Connectors 27
- Operating System Support 29
- 28 Overview 30
- Introduction to RAID 31
- RAID Definition 32
- Components and Features 33
- Consistency Check 34
- Disk Striping 34
- Stripe Width 35
- Stripe Size 35
- Disk Mirroring 36
- Disk Spanning 37
- Hot Spares 39
- Disk Rebuilds 40
- Hot Swap 41
- SCSI Drive States 41
- Logical Drive States 42
- Enclosure Management 42
- RAID Levels 43
- Selecting a RAID Level 44
- 44 RAID Levels 46
- Figure 3-1. RAID 0 Array 46
- 46 RAID Levels 48
- Figure 3-2. RAID 1 Array 48
- 48 RAID Levels 50
- Figure 3-3. RAID 5 Array 50
- 50 RAID Levels 52
- Figure 3-4. RAID 10 Array 52
- 52 RAID Levels 54
- Figure 3-5. RAID 50 Array 54
- PERC 3/SC Features 55
- Hardware Requirements 56
- Configuration Features 56
- SMART Technology 57
- Array Performance Features 58
- Software Utilities 59
- PERC 3/SC Specifications 60
- PCI Bridge/CPU 61
- Cache Memory 61
- 60 PERC 3/SC Features 62
- SCSI Firmware 63
- RAID Management 63
- PERC 3/DC and PERC 65
- 3/DCL Features 65
- Configuration on Disk 67
- Fault Tolerance Features 69
- PERC 3/DC and PERC 3/DCL 70
- Specifications 70
- PERC 3/DC and PERC 3/DCL BIOS 72
- Onboard Speaker 72
- Serial Port 72
- SCSI Bus 72
- PERC 3/QC Features 75
- PERC 3/QC Specifications 80
- 80 PERC 3/QC Features 82
- Configuring PERC 3 85
- Current Configuration 86
- Channel 1 87
- Channel 2 88
- Logical Drive Configuration 89
- Physical Device Layout 91
- Configuring Arrays 94
- Configuration Strategies 95
- Maximizing Capacity 96
- Assigning RAID Levels 97
- Configuring Logical Drives 98
- Optimizing Data Storage 98
- Array Functions 99
- Random Array Deletion 101
- Configuration Module 102
- PERC 3/SC Hardware 103
- Installation 103
- Requirements 104
- Installation Steps 105
- PERC 3/SC Card Layout 105
- Step 1—Unpack 106
- Step 2—Power Down 106
- Step 3—Set Jumpers 107
- J9 I2C Interface Connector 108
- J5 Serial Port 108
- J8 Hard Disk LED 109
- J10 Term Power 109
- Step 4—Set SCSI Termination 110
- SCSI Termination 111
- Selecting a Terminator 111
- Step 5—Install PERC 3/SC 113
- Motherboard 114
- Step 6—Connect SCSI Cables 115
- Step 7—Set Target IDs 116
- Step 8—Power On Host System 117
- PERC 3/DC or PERC 119
- 3/DCL Hardware 119
- PERC 3/DC Card Layout 121
- PERC 3/DCL Card Layout 122
- J2, and J3 Termination Enable 124
- J9 Onboard BIOS Enable 124
- J10 NVRAM Clear 125
- J11 Serial Port 125
- J13 Dirty Cache LED 125
- J14 SCSI Activity LED 126
- J16 and J18 TERMPWR Enable 126
- PERC 3/DC and 3/DCL 128
- Step 7—Connect SCSI Cables 130
- Connect SCSI Devices 131
- Cable Suggestions 131
- PERC 3/QC Hardware 135
- PERC 3/QC Card Layout 137
- J14 Serial Port 141
- J17 Dirty Cache LED 141
- J19 Onboard BIOS Enable 141
- Figure 10-4 144
- Step 5—Install PERC 3/QC 145
- Step 8—Power on Host System 148
- WebBIOS Configuration Utility 149
- PERC 3 BIOS 151
- Configuration Utility 151
- Configuration On Disk 152
- Starting the PERC 3 BIOS 152
- Options 153
- Configure Menu 154
- Initialize Menu 155
- Objects Menu 155
- (continued) 156
- Logical Drive 157
- Virtual Sizing 157
- Physical Drive 158
- Battery Information 159
- Format Menu 160
- Rebuild Menu 160
- Check Consistency Menu 161
- Easy Configuration 162
- New Configuration 162
- View/Add Configuration 163
- Press <F4> 164
- Using Easy Configuration 165
- Using New Configuration 169
- Using View/Add Configuration 175
- 18 Set the Read Policy 179
- 19 Set the Read Policy 179
- Initializing Logical Drives 180
- Deletion) 181
- Formatting Physical Drives 182
- Batch Formatting 183
- Individual Formatting 183
- Rebuilding Failed Disk Drives 184
- Exiting the PERC 3 BIOS 186
- Setting Hardware Termination 186
- Clustering 187
- Dell Manager 189
- Starting Dell Manager 190
- Management Menu Options 191
- Dell Manager Menu Options 192
- Logical Drive Settings 193
- Physical Drive Menu 194
- 12-8 displays the menu items 195
- Reconstruct Menu 197
- Parameters 198
- Formatting Drives 202
- Exiting Dell Manager 204
- Troubleshooting 205
- Overview 206
- BIOS Boot Error Messages 207
- Other BIOS Error Messages 210
- Other Potential Problems 211
- Audible Warnings 212
- Appendix A: SCSI 213
- Cables and Connectors 213
- Appendix B: 215
- Warranties and Return 215
- General Provisions 221
- Guarantee 237
- Exclusions 237
- Making a Claim 237
- Glossary 239
- 238 Glossary 240
- Glossary 239 241
- 240 Glossary 242
- Glossary 241 243
- 242 Glossary 244
- Glossary 243 245
- 244 Glossary 246
- Glossary 245 247
- 246 Glossary 248
- Index 247 249
- 248 Index 250
- 249 Index 251
- 250 Index 252
- Printed in the U.S.A 254
- P/N 5C229 Rev. A04 254
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