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Understanding Drive Arrays B-7
Compaq Confidential – Need to Know Required
Writer: CDresden Project: Compaq Integrated Smart Array Controller User Guide Comments:
Part Number: 153236-001 File Name: i-appb Understanding Drive Arrays.doc Last Saved On: 8/27/99 11:35 AM
CAUTION: RAID 0 has no data protection. You must rely on backups in case of
hardware failure on drives with no fault tolerance.
Distributed Data Guarding (RAID 5)
Distributed data guarding, also called RAID 5, stores parity data across all the
drives in the array. Spreading the parity across all the drives allows
simultaneous read. If a drive fails, the controller uses the parity data and the
data on the remaining drives to reconstruct data from the failed drive. This
allows the system to continue operating with a slightly reduced performance
until you replace the failed drive.
Distributed data guarding requires an array with a minimum of three physical
drives and allows a maximum of 15 drives. Therefore, in an array containing
three physical drives, distributed data guarding uses only 33 percent of the
total logical drive storage capacity for fault tolerance, while a 15-drive
configuration uses only 7 percent.
DATA
P
P
P
P
P
P
P
P
P
DATADATADATA
P = Parity
Figure B-5. Distributed data guarding distributes the redundant data [P]
throughout the physical drives
- User Guide 1
- Part Number 153236-001 1
- Compaq Computer Corporation 1
- Contents 3
- Chapter 2 4
- Chapter 3 4
- Chapter 4 4
- Chapter 5 4
- Chapter 6 5
- Appendix A 6
- Appendix B 6
- Appendix C 7
- About This Guide 9
- Symbols in Text 10
- Symbols on Equipment 10
- Rack Stability 11
- Getting Help 12
- Compaq Website 13
- Compaq Authorized Reseller 13
- Controller Features 15
- Controller Interface 16
- Drive Array Technology 17
- Fault Tolerance 18
- Drive Movement 18
- Read-Cache Memory 18
- Wide Ultra2 SCSI Technology 19
- Configuration Utilities 20
- Controller 23
- External Cabling 25
- External Cables 26
- Configuring the Controller 28
- Updating Firmware 29
- ROMPaq Diskettes 30
- Running System ROMPaq 31
- Running Options ROMPaq 33
- Option ROM Configuration 35
- Initial Start Screen 36
- Create Logical Drive Screen 37
- Confirmation Screen 38
- Before Installing Drivers 42
- Materials Needed 42
- Operating Systems 43
- (PAS) Diskettes 44
- C:\DIR\SPXXXX.exe 45
- A:\README 45
- Novell NetWare 46
- Installation Procedure 47
- Microsoft Windows NT 4.0 49
- README.BAT 50
- A:\README.BAT 50
- A:\SETUP 51
- Microsoft Windows 2000 54
- SmartStart 55
- The Internet 55
- Installing the Driver 56
- SCO OpenServer 5 57
- Compaq SCO OpenServer 5 58
- SCO OpenServer 5 (Non-Compaq) 58
- SCO UnixWare 2.1 or Later 59
- IBM OS/2 60
- Controller Ordering 62
- Partitioning 63
- Controller Drive 63
- Command Line Switches 64
- BASEDEV=CPQARRAY.ADD /A:2 /I 65
- Banyan VINES 7.0 or Later 66
- Before You Begin 70
- Running the Compaq 70
- Array Configuration Utility 70
- ACU Online 71
- Microsoft Windows NT 71
- Configuration Wizards 72
- Online Help 72
- Main Configuration Screen 73
- Menu Bar 74
- Controller Selection Frame 75
- More Information Bar 76
- Drive View Buttons 76
- Controller Buttons 76
- Array Buttons 77
- Logical Drive Button 77
- Controller Settings Screen 78
- Create Drive Array Screen 79
- Array Accelerator Frame 81
- Stripe Size 81
- Table 6-1 82
- Stripe Size Fault Tolerance 82
- Autoconfiguration 82
- Custom Configuration 83
- Drive Rebuild 85
- Priority Settings 86
- Accelerator Ratio 86
- Expand an Array 86
- Add or Configure Spare Drives 86
- ■ Interim Recovery 87
- ■ Ready for Recovery 87
- Handling Disk Drive Failures 88
- Configuration Procedures 90
- Grouping Physical Drives 92
- Figure 6-20. Example Array B 93
- Expanding Capacity 97
- Capacity Extension 100
- Extending Logical Drives 101
- Online Migration 102
- Online Stripe Size Migration 103
- Errors and Warnings 104
- Electrostatic Discharge 105
- Grounding Methods 106
- Understanding Drive Arrays 107
- Drive Arrays 110
- Logical Drives 110
- Drive Array Benefits 111
- Table B-1 112
- RAID Level Characteristics 112
- P = Parity 113
- Drive Mirroring and Striping 114
- (RAID 1 and RAID 0+1) 114
- No Fault Tolerance (RAID 0) 115
- Online Spares 115
- Performance Enhancement 116
- Optimized Request Management 117
- Bus Master Data Transfers 118
- Adding Storage Capacity 119
- ■ Hot-plug hard drives 121
- Data Reliability 122
- Dynamic Sector Repairing 123
- Drive Parameter Tracking 123
- Drive Failure Alert Features 123
- Interim Data Recovery 123
- Automatic Data Recovery 124
- Hot-Plug Drives 124
- Recovering from Drive Failure 126
- Recognizing a Drive Failure 127
- Replacing a Failed Drive 129
- Compromised Fault Tolerance 131
- Questions and Answers 133
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