Dell PowerVault MD3600i Manuel d'utilisateur Page 41
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Planning: MD3600i Series Storage Array Terms and Concepts 41
RAID Levels
RAID levels determine the way in which data is written to physical disks.
Different RAID levels provide different levels of accessibility, redundancy, and
capacity.
Using multiple physical disks has the following advantages over using a single
physical disk:
• Placing data on multiple physical disks (striping) allows input/output (I/O)
operations to occur simultaneously and improve performance.
• Storing redundant data on multiple physical disks using mirroring or parity
supports reconstruction of lost data if an error occurs, even if that error is
the failure of a physical disk.
Each RAID level provides different performance and protection. You should
select a RAID level based on the type of application, access, fault tolerance,
and data you are storing.
The storage array supports RAID levels 0, 1, 5, 6, and 10. The maximum
number of physical disks that can be used in a disk group depends on the
RAID level:
• 96 for RAID 0, 1 and 10
• 30 for RAID 5 and 6.
RAID Level Usage
To ensure best performance, you should select an optimal RAID level when
you create a system physical disk. The optimal RAID level for your disk array
depends on:
• Number of physical disks in the disk array
• Capacity of the physical disks in the disk array
• Need for redundant access to the data (fault tolerance)
• Disk performance requirements
RAID 0
RAID 0 uses disk striping to provide high data throughput, especially for large
files in an environment that requires no data redundancy. RAID 0 breaks the
data down into segments and writes each segment to a separate physical disk.
book.book Page 41 Thursday, December 9, 2010 3:20 PM
- Owner’s Manual 1
- Notes, Cautions, and Warnings 2
- Contents 3
- 4 Contents 4
- 6 Configuration: About Your 6
- 8 Contents 8
- 10 Contents 10
- 12 Contents 12
- 16 Management: Installing 13
- 14 Contents 14
- 19 Troubleshooting: Your 15
- 16 Contents 16
- Contents 17 17
- 18 Contents 18
- Introduction 19
- Series Storage Array 20
- 22 Introduction 22
- Overview 23
- Hardware Features 24
- Hard-Drive Indicator Patterns 28
- Power Indicator Codes 30
- RAID Controller Modules 31
- Battery Backup Unit 34
- Cache Functions and Features 35
- Write-Through Cache 36
- Array Terms and Concepts 37
- Physical Disks 38
- Physical Disk States 38
- Virtual Disks and Disk Groups 39
- Virtual Disk States 40
- RAID Levels 41
- Segment Size 43
- Virtual Disk Operations 43
- Consistency Check 44
- Media Verification 44
- Cycle Time 44
- Disk Group Operations 45
- Segment Size Migration 46
- Disk Group Defragmentation 47
- Disk Group Operations Limit 47
- Disk Migration 48
- Disk Roaming 50
- Advanced Features 51
- Multi-Path Software 54
- Virtual Disk Ownership 55
- Load Balancing 56
- Configuration: Overview 61
- Enterprise Management Window 62
- Array Management Window 63
- Out-of-Band Management 65
- Storage Arrays 66
- Setting Up Your Storage Array 68
- Locating Storage Arrays 70
- Setting a Password 71
- Password Guidelines 72
- Removing Storage Arrays 74
- Enabling Premium Features 74
- Displaying Failover Alert 75
- Configuring E-mail Alerts 77
- Configuring SNMP Alerts 80
- Battery Settings 81
- Configuration: Using iSCSI 83
- Creating CHAP Secrets 84
- Initiator CHAP Secret 85
- Target CHAP Secret 85
- Statistics 91
- Configuration: Event Monitor 93
- Configuring Host Access 95
- Using the Mappings Tab 96
- Defining a Host 97
- Removing Host Access 98
- Managing Host Groups 99
- Removing a Host Group 101
- Host Topology 101
- I/O Data Path Protection 103
- Virtual Disks 107
- Creating Disk Groups 108
- Locating a Disk Group 110
- Creating Virtual Disks 110
- Changing the I/O Type 116
- 512 KB) 117
- Creating a Security Key 120
- Changing a Security Key 122
- Saving a Security Key 124
- Validate Security Key 125
- Erasing Secure Physical Disks 126
- Hot Spares and Rebuild 128
- Global Hot Spares 128
- Hot Spare Operation 129
- Hot Spare Drive Protection 129
- Enclosure Loss Protection 130
- Host-to-Virtual Disk Mapping 131
- Restricted Mappings 137
- Disk Group 139
- Storage Partitioning 141
- Disk Group Expansion 143
- Virtual Disk Expansion 144
- Using Free Capacity 144
- Using Unconfigured Capacity 144
- Disk Group Migration 145
- Import Disk Group 146
- Storage Array Media Scan 147
- Changing Media Scan Settings 148
- Suspending the Media Scan 149
- Snapshot Virtual Disks 151
- Simple Path 153
- Advanced Path 156
- Snapshot Repository Capacity 163
- PowerVault Modular 166
- Virtual Disk Copy 169
- Creating a Virtual Disk Copy 172
- Before you Begin 173
- Create Copy Wizard 174
- Failed Virtual Disk Copy 174
- Failed RAID Controller Module 175
- Copy Manager 175
- Copying the Virtual Disk 175
- Setting Copy Priority 177
- Stopping a Virtual Disk Copy 178
- Recopying a Virtual Disk 179
- Recopying the Virtual Disk 180
- Removing Copy Pairs 181
- Configuration: Device Mapper 185
- Multipath for Linux 185
- Using DM Multipathing Devices 186
- Window (EMW) 187
- Ready For Use 191
- Limitations and Known Issues 193
- Troubleshooting 194
- from DM 195
- Packages 197
- Firmware 198
- EMM Firmware 205
- Technology (SMART) 206
- Management: Installing Array 209
- Components 209
- Front Bezel (Optional) 210
- Hard Drives 211
- Installing a Drive Blank 212
- Removing a Hard Drive 212
- Installing a Hard Drive 214
- RAID Controller Module 217
- Control Panel 227
- Installing the Control Panel 228
- Backplane 229
- Installing the Backplane 232
- Management: System Interfaces 235
- Array Software 237
- Storage Array Support Data 241
- Retrieving Trace Buffers 242
- Collecting Physical Disk Data 244
- Event Log 245
- Recovery Guru 246
- Storage Array Profile 246
- Finding Nodes 249
- Using Go To 250
- Condition 251
- Locating a Physical Disk 254
- SMrepassist Utility 257
- Unidentified Devices 258
- Software 261
- Troubleshooting: Your Array 263
- Management Modules 265
- Troubleshooting Hard Drives 268
- Connections 269
- Conditions 271
- Invalid Storage Array 271
- ECC Errors 271
- PCI Errors 272
- Critical Conditions 272
- Noncritical Conditions 272
- Getting Help 273
- 274 Getting Help 274
- Index 275 275
- Index 276 276
- Index 277 277
- Index 278 278
- Index 279 279
- Index 280 280
- Index 281 281
- 282 Index 282
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