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100 Sun StorageTek SAS RAID HBA Installation Guide • March 2010
RAID 6 Arrays
A RAID 6 array—also referred to as dual drive failure protection—is similar to a RAID
5 array because it uses data striping and parity data to provide redundancy.
However, RAID 6 arrays include two independent sets of parity data instead of one.
Both sets of parity data are striped separately across all disk drives in the array.
RAID 6 arrays provide extra protection for your data because they can recover from
two simultaneous disk drive failures. However, the extra parity calculation slows
performance (compared to RAID 5 arrays).
RAID 6 arrays must be built from at least four disk drives. Maximum stripe size
depends on the number of disk drives in the array.
FIGURE F-8 RAID 6 Arrays
- Sun StorageTekSAS RAID HBA 1
- Contents 3
- ▼ To View the Event Log 78 8
- Contents ix 9
- Declaration of Conformity 115 10
- Index 131 10
- Before You Read This Document 11
- Related Documentation 12
- Training 13
- Documentation Comments 13
- HBA Overview 15
- HBA Features 16
- Component Layout 17
- Requirements 19
- System Interoperability 20
- Server Support 21
- Software Support 21
- Observing ESD and Handling 23
- Precautions 23
- Installation Task Map 26
- ■ ESD wrist strap 28
- SPARC System 30
- Installing the HBA 31
- Connecting Disk Drives 33
- Testing the HBA Installation 34
- No Logical Drives Found 38
- Next Steps 39
- Removing the Hardware 39
- ▼ To Remove the HBA 40
- Creating an Array 42
- Making the Array Bootable 45
- Setting the Boot HBA 45
- Install the Solaris OS 48
- ▼ To Create a Logical Drive 49
- # ./arcconf GETCONFIG 1 LD 51
- # devfsadm 51
- Array on an x64 System 53
- Preparing to Install an OS 54
- ■ “Next Steps” on page 47 59
- Installing the Solaris OS 60
- Operating System 63
- Linux OS 64
- Known Issues 67
- BIOS Utility Issues 68
- Performance Issues 68
- Chapter 8 Known Issues 55 69
- Configuration Rules 71
- ■ Maximum length of 1 meter 72
- HBA Specifications 73
- Environmental Specifications 74
- DC Power Requirements 74
- Current Requirements 74
- Performance Specifications 74
- Connector Pin Definitions 75
- SATA Pin-Out 76
- SATA Power Pin-Out 77
- Introduction to the BIOS RAID 80
- Configuration Utility 80
- Hot-Plug Addition Conditions 81
- Conditions 81
- ▼ To Start the ACU 84
- ■ Delete an array 85
- Settings 87
- General HBA Settings 88
- Select Utility 89
- Utilities 90
- ▼ To View the Event Log 92
- Troubleshooting 93
- Silencing the Alarm 94
- Appendix D Troubleshooting 81 95
- Best Practices 97
- Making New Connections 98
- Enclosures 99
- Failure Conditions 99
- Failures 100
- Discovering Drives 101
- Order of Logical Drives 101
- RAID Logical Devices 102
- Appendix E Best Practices 89 103
- Selecting the Best RAID Level 105
- Understanding Drive Segments 106
- Nonredundant Arrays (RAID 0) 106
- RAID 1 Arrays 107
- RAID 1 Enhanced Arrays 108
- RAID 10 Arrays 109
- RAID 5 Arrays 110
- RAID 5EE Arrays 111
- RAID 50 Arrays 112
- RAID 6 Arrays 114
- RAID 60 Arrays 115
- Migrating RAID Levels 116
- APPENDIX 117
- About SAS 118
- About Phys 119
- About SAS Ports 120
- About SAS Addresses 120
- About SAS Connectors 121
- About SAS Cables 121
- About SAS Connection Options 122
- SAS Expander Connections 123
- Declaration of Conformity 129
- Safety Precautions 131
- Battery Warning 132
- System Unit Cover 133
- Rack System Instructions 133
- Laser Compliance Notice 133
- CD and DVD Devices 133
- Mesures de sécurité 133
- Symboles 134
- Modification du matériel 134
- Conformité SELV 134
- Couvercle de l'unité 135
- Périphériques CD et DVD 135
- Vorschriften 136
- Anschluss des Netzkabels 137
- Warnung bezüglich Batterien 137
- Gehäuseabdeckung 137
- Anweisungen zur Rack-Montage 137
- Normativas de seguridad 138
- Class 1 Laser Product 140
- Luokan 1 Laserlaite 140
- Klasse 1 Laser Apparat 140
- Laser Klasse 1 140
- FCC Class B Notice 143
- GOST-R Certification Mark 144
- Index 133 147
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