Hp Smart Storage Administrator Manuel d'utilisateur Page 107
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Troubleshooting 107
With an array controller installed in the system, the capacity of several physical drives can be combined into
one or more virtual units called logical drives (also called logical volumes and denoted by Ln in the figures in
this section). Then, the read/write heads of all the constituent physical drives are active simultaneously,
reducing the total time required for data transfer.
Because the read/write heads are active simultaneously, the same amount of data is written to each drive
during any given time interval. Each unit of data is called a block (denoted by Bn in the figure), and adjacent
blocks form a set of data stripes (Sn) across all the physical drives that comprise the logical drive.
For data in the logical drive to be readable, the data block sequence must be the same in every stripe. This
sequencing process is performed by the array controller, which sends the data blocks to the drive write heads
in the correct order.
A natural consequence of the striping process is that each physical drive in a given logical drive will contain
the same amount of data. If one physical drive has a larger capacity than other physical drives in the same
logical drive, the extra capacity is wasted because it cannot be used by the logical drive.
- 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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