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Troubleshooting 110
RAID 1 and RAID 1+0 (RAID 10)
In RAID 1 and RAID 1+0 (RAID 10) configurations, data is duplicated to a second drive.
When the array contains only two physical drives, the fault-tolerance method is known as RAID 1.
When the array has more than two physical drives, drives are mirrored in pairs, and the fault-tolerance
method is known as RAID 1+0 or RAID 10.
In each mirrored pair, the physical drive that is not busy answering other requests answers any read requests
that are sent to the array. This behavior is called load balancing. If a physical drive fails, the remaining drive
in the mirrored pair can still provide all the necessary data. Several drives in the array can fail without
incurring data loss, as long as no two failed drives belong to the same mirrored pair.
This fault-tolerance method is useful when high performance and data protection are more important than the
cost of physical drives.
Advantages:
• This method has the second highest read performance of any fault-tolerant configuration.
- User Guide 1
- Contents 3
- Contents 4 4
- Overview 5
- Array configuration overview 6
- Minimum requirements 8
- Overview 9 9
- Operations 10
- Prerequisites 11
- Specify the ISO image path 13
- • NFS: 13
- Using the HP SSA GUI 16
- Icon and key stroke legend 17
- Navigating the GUI 18
- Configure screen 19
- Operations 20 20
- Diagnostics screen 21
- HP SSA help 22
- Configuration tasks 23
- Configuring a controller 24
- HP SSD Smart Path 26
- Rapid Parity Initialization 27
- Operations 29 29
- Cache Manager 32
- Click Caching Settings 33
- About HP SmartCache 34
- Enable HP SmartCache 34
- Click OK 35
- Working with mirrored arrays 38
- Healing an array 41
- Replacing an array 41
- Setting Auto RAID 0 42
- Operations 43 43
- Diagnostic tasks 44
- Using the HP SSA CLI 46
- CLI syntax 47
- The <target> variable 48
- The <command> variable 48
- Querying a device 48
- Hiding warning prompts 49
- Keyword abbreviations 49
- The show command 50
- Operations 51 51
- Typical procedures 52
- Setting the boot volume 53
- Setting the target 53
- Identifying devices 54
- Deleting target devices 54
- Erasing a physical drive 55
- Rescanning the system 55
- Creating a logical drive 56
- Sample scenario 57
- Moving a logical drive 58
- Viewing SSD physical drives 59
- Viewing SSD information 60
- SmartCache in HPSSACLI 60
- Managing spare drives 61
- Expanding an array 62
- Shrinking an array 63
- Moving an array 63
- Extending a logical drive 65
- Migrating a logical drive 65
- Operations 66 66
- Operations 67 67
- Operations 68 68
- Operations 69 69
- Using HP SSA scripting 70
- Script file requirements 71
- Sample custom input script 71
- Operations 72 72
- Sample custom capture script 73
- Sample encryption script 74
- Script file options 75
- Control category 76
- Controller category 77
- Operations 78 78
- Operations 79 79
- Array category 80
- Operations 81 81
- Logical Drive category 83
- Operations 84 84
- Operations 85 85
- Operations 86 86
- Operations 87 87
- Encryption support commands 88
- Operations 89 89
- XML support 90
- Operations 91 91
- XML input 92
- XML input file DTD 92
- Operations 93 93
- Warning 94
- Troubleshooting 101
- Installing the utility 103
- Diagnostic report procedures 104
- Drive arrays 106
- Troubleshooting 107 107
- Troubleshooting 108 108
- Fault-tolerance methods 109
- Troubleshooting 110 110
- Troubleshooting 111 111
- Troubleshooting 112 112
- Troubleshooting 113 113
- RAID 50 114
- RAID 60 115
- Selecting a RAID method 116
- Troubleshooting 117 117
- Diagnosing array problems 118
- Troubleshooting 119 119
- Optional components 120
- HP Smart Array Advanced Pack 121
- Acronyms and abbreviations 122
- Documentation feedback 124
- Index 125 125
- Index 126 126
- Index 127 127
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