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E-6 Compaq StorageWorks RAID Array 4100 User Guide
Table E-1
RAID Level Characteristics
Distributed
Data
Guarding
(RAID 5)
Data
Guarding
(RAID 4)
Mirroring
(RAID 1)
No Fault
Tolerance
(RAID 0)
Usable Disk
Space*
67% to 93% 67% to 93% 50% 100%
Disk Space
Formula
(n = no. of
drives)
(n-1)/n (n-1)/n n/2 n
Parity and
Data
Redundancy
Parity
distributed
over each
drive
Dedicated
parity drive
Duplicate
data
None
Minimum
Number of
Drives
3321
Comments
Tolerant of
single drive
failures.
Higher
performance
than RAID 4.
Uses the
least
amount of
storage
capacity for
fault
tolerance.
Tolerant of
single drive
failures.
Like RAID 5,
uses the
least
amount of
storage
capacity for
fault
tolerance.
Tolerant of
multiple,
simultaneous
drive failures.
Higher
performance
than RAID 4 or
5. Uses the
most storage
capacity for
fault tolerance.
Requires an
even number
of drives.
Best
performance
but data is
lost if any
drive in the
logical drive
fails. Uses
no storage
space for
fault
tolerance.
* All drives are the same capacity
If you require a fault-tolerant system for critical data, use RAID 5 for
maximum storage space efficiency. Use RAID 1 if I/O performance is more
important.
If you will be storing non-critical data, and space and performance are both
important, RAID 0 offers the best of both parameters. However, RAID 0 has
- RAID Array 4100 1
- Second Edition (January 2000) 2
- Part Number 146297-002 2
- Contents 3
- Chapter 2 4
- Chapter 3 4
- Chapter 4 5
- Chapter 5 5
- Chapter 6 6
- Appendix A 6
- Appendix B 6
- Appendix C 6
- Appendix D 6
- Appendix E 7
- About This Guide 8
- Text Conventions 9
- Symbols in Text 10
- Symbols on Equipment 10
- Rack Stability 11
- Getting Help 11
- Compaq Technical Support 12
- Compaq Website 12
- Compaq Authorized Reseller 13
- Introduction 14
- Features 15
- Introduction 1-3 16
- Table 1-1 16
- RA4100 Features 16
- Front Panel Features 17
- Fan Assembly 18
- Hot-Pluggable Drives 19
- Maximum Storage 19
- SCSI ID Assignments 19
- Fault Tolerance 21
- Capacity Expansion 21
- Performance Monitoring 23
- Automatic Performance Tuning 23
- Tagged-Command Queuing 23
- System Power 23
- Redundant Power Supply 24
- Installation 25
- 1. Choose a location 26
- Installing the RA4100 28
- Environment 29
- Grounding 30
- Temperature Requirements 30
- Airflow Requirements 31
- Blanking Panels 32
- TROJO33.EPS 33
- TROJ026.eps 34
- TROJ034.eps 34
- TROJ035.eps 35
- Installing the Storage Hub 37
- Installing the Storage Hub 12 38
- Fibre Channel Cables 39
- Connecting the Power 42
- TROJ011.EPS 42
- Operation 44
- Front Panel 45
- Power Supply 46
- Hard Drives 48
- Troubleshooting 49
- Fibre Host Adapter LEDs 50
- RA4000 Controller LEDs 51
- Table 4-1 52
- Storage Hub 7 53
- Storage Hub 12 54
- Redundant Controller 57
- Controller 59
- Replacing GBICs 64
- Removing Fibre Channel Cables 65
- Replacing the Fan Assembly 67
- Replacing Hard Drives 69
- Configuration Wizards 76
- Configuration Procedures 77
- Creating a New Array—Example 78
- Port 1:SCSI ID 0 80
- Port 1:SCSI ID 1 80
- Port 1:SCSI ID 2 80
- Figure 5-5. Example Array A 81
- Configuration Utility 82
- 8. Click the Done button 86
- 2. Click the Drive menu 87
- 5. Click Done 88
- Online Migration 89
- 6. Click Done 90
- Redundant Controllers 91
- Main Configuration Screen 92
- Controller Selection Box 93
- View Box 93
- More Information Button 94
- Drive View Box 94
- Controller Buttons 94
- Array Buttons 95
- Logical Drive Buttons 95
- Controller Settings Screen 96
- Create Array Screen 97
- Create Logical Drive Screen 98
- Stripe Size 99
- Table 5-1 99
- Stripe Size Fault Tolerance 99
- Error and Warning Messages 100
- Utility (CPQONLIN) 100
- CPQFC.HAM and CPQSHD.CDM 100
- Auto-configuration 101
- Custom Configuration 102
- Priority Settings 103
- Drive Rebuild 103
- Accelerator Ratio 104
- Expanding an Array 104
- Handling Disk Drive Failures 106
- Options ROMPaq 108
- Regulatory Compliance Notices 111
- European Union Notice 112
- Japanese Notice 113
- Taiwanese Notice 113
- Laser Compliance 113
- Battery Replacement Notice 114
- Electrostatic Discharge 115
- Grounding Methods 116
- Specifications 117
- Table C-1 118
- RA4100 Specifications 118
- Fibre Channel Technology 119
- Advantages of Fibre Channel 120
- Point-to-Point Connection 121
- Arbitrated Loop 122
- Server RA4100 1 123
- Exchange 125
- Sequence 125
- Fibre Channel 125
- Protocol Layers 126
- Hard Drive Arrays 127
- Hard Drive Arrays E-3 129
- Drive Arrays 130
- Logical Drives 130
- Drive Array Benefits 131
- Table E-1 132
- RAID Level Characteristics 132
- DATADATADATA 133
- Data Guarding (RAID 4) 134
- Drive Mirroring (RAID 1) 134
- DAZ-10-2.EPS 135
- Performance Enhancement 136
- Array Accelerator 137
- Performance 138
- Data Protection 138
- ECC Memory 138
- Batteries 138
- Optimized Request Management 139
- Expanding Storage Capacity 140
- Online Capacity Expansion 142
- Hard Drive Upgrades 142
- Auto Reliability Monitoring 143
- Dynamic Sector Repairing 143
- Drive Parameter Tracking 143
- Drive Failure Alert Features 144
- Interim Data Recovery 144
- Automatic Data Recovery 144
- Appendix F 145
- Recognizing a Drive Failure 145
- Replacing a Failed Drive 147
- Compromised Fault Tolerance 149
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