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Item RAID 0 RAID 1+0 RAID 5 RAID 6
(ADG)
RAID 1(0)
(ADM)
Alternative name
Striping (no
fault
tolerance)
Mirroring Distributed
Data
Guarding
Advanced
Data
Guarding
Advanced
Data
Mirroring
Formula for number of drives usable
for data (n = total number of drives in
array)
n n/2 n-1 n-2 n/3
Percentage of drive space usable*
100% 50% 67% to 93% 50% to 96% 33%
Minimum number of physical drives
1 2 3 4 3
Tolerates failure of one physical drive
No Yes Yes Yes Yes
Tolerates simultaneous failure of
more than one physical drive
No Only if no
two failed
drives are in
the same
mirrored
pair
No Yes Only if no
three drives
are in the
same mirror
group**
Read performance
High High High High High
Write performance
High Medium Low Low Medium
Relative cost
Low High Medium Medium Very high
*Values for the percentage of drive space usable are calculated with these assumptions: (1) all physical drives in the
array have the same capacity; (2) online spares are not used; (3) no more than 14 physical drives are used per array for
RAID 5; and (4) no more than 56 drives are used with RAID 6 (ADG).
**Mirror groups include the physical drives in each mirror.
Selecting a RAID method
Not all controllers support all RAID levels. To determine the RAID capabilities of your controller, see the
model-specific information for your controller on the HP website
(http://www.hp.com/products/smartarray).
Most important criterion Also important Suggested RAID level
Fault tolerance
Cost effectiveness
I/O performance
RAID 6
RAID 10 (ADM), RAID 1+0, RAID 50, RAID 60
Cost effectiveness
Fault tolerance
I/O performance
RAID 6
RAID 5 (RAID 0 if fault tolerance is not required)
I/O performance
Cost effectiveness
Fault tolerance
RAID 5 (RAID 0 if fault tolerance is not required)
RAID 10 (ADM), RAID 1+0, RAID 50, RAID 60
Alternative fault-tolerance methods
Your operating system may also support software-based RAID or controller duplexing.
• Software-based RAID resembles hardware-based RAID, except that the operating system works with
logical drives as if they were physical drives. To protect against data loss caused by physical drive
failure, each logical drive must be in a different array from the others.
• Controller duplexing uses two identical controllers with independent, identical sets of drives containing
identical data. In the unlikely event of a controller failure, the remaining controller and drives will service
all requests.
- 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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