Dell PowerVault MD3200i User Manual Page 42
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42 Planning: MD3200i Series Storage Array Terms and Concepts
is recommended for small databases or other applications that do not require
large capacity. RAID 1 provides full data redundancy. For example accounting,
payroll, or financial applications.
RAID 5
RAID 5 uses parity and striping data across all physical disks (distributed
parity) to provide high data throughput and data redundancy, especially for
small random access. This is a versatile RAID level and is suited for multi-user
environments where typical I/O size is small and there is a high proportion of
read activity such as file, application, database, web, e-mail, news, and
intranet servers.
RAID 6
RAID 6 is similar to RAID 5 but provides an additional parity disk for better
redundancy. This is the most versatile RAID level and is suited for multi-user
environments where typical I/O size is small and there is a high proportion of
read activity. RAID 6 is recommended when large size physical disks are used
or large number of physical disks are used in a disk group.
RAID 10
RAID 10, a combination of RAID 1 and RAID 0, uses disk striping across
mirrored disks. It provides high data throughput and complete data
redundancy. Utilizing an even number of physical disks (four or more) creates
a RAID level 10 disk group and/or virtual disk. Because RAID levels 1 and 10
use disk mirroring, half of the capacity of the physical disks is utilized for
mirroring. This leaves the remaining half of the physical disk capacity for
actual storage. RAID 10 is automatically used when a RAID level of 1 is
chosen with four or more physical disks. RAID 10 works well for medium-
sized databases or any environment that requires high performance and fault
tolerance and moderate-to-medium capacity.
Segment Size
Disk striping enables data to be written across multiple physical disks. Disk
striping enhances performance because striped disks are accessed
simultaneously.
book.book Page 42 Tuesday, June 18, 2013 3:15 PM
- Owner’s Manual 1
- Notes, Cautions, and Warnings 2
- Contents 3
- 4 Contents 4
- 6 Configuration: About Your 6
- 8 Contents 8
- 11 Configuration: Premium 10
- 12 Configuration: Premium 11
- Feature—Virtual Disk Copy 11
- 12 Contents 12
- 14 Contents 14
- 16 Contents 16
- 18 Contents 18
- Introduction 19
- Series Storage Array 20
- Introduction 21 21
- 22 Introduction 22
- Overview 23
- Hardware Features 24
- Hard-Drive Indicator Patterns 28
- RAID Controller Modules 31
- Battery Backup Unit 34
- Cache Functions and Features 35
- Write-Through Cache 36
- Array Terms and Concepts 37
- Physical Disk States 38
- Virtual Disks and Disk Groups 39
- RAID Levels 40
- RAID Level Usage 41
- Segment Size 42
- Virtual Disk Operations 43
- Consistency Check 44
- Media Verification 44
- Cycle Time 44
- Disk Group Operations 45
- Disk Group Defragmentation 46
- Disk Group Operations Limit 47
- Disk Migration 48
- Advanced Features 50
- Host Types 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 69
- Setting a Password 71
- Password Guidelines 72
- Removing Storage Arrays 73
- Enabling Premium Features 74
- Failover Alert Display 74
- Configuring E-mail Alerts 76
- Configuring SNMP Alerts 79
- Battery Settings 81
- Configuration: Using iSCSI 83
- Creating CHAP Secrets 84
- Initiator CHAP Secret 85
- Target CHAP Secret 85
- Statistics 91
- 92 Configuration: Using iSCSI 92
- Configuration: Event Monitor 93
- Configuring Host Access 95
- Using the Mappings Tab 96
- Removing Host Access 98
- Managing Host Groups 98
- Adding a Host to a Host Group 99
- Removing a Host Group 100
- Host Topology 100
- I/O Data Path Protection 102
- Virtual Disks 105
- Creating Disk Groups 106
- Locating a Disk Group 108
- Creating Virtual Disks 108
- Changing the I/O Type 114
- Creating a Security Key 118
- Changing a Security Key 119
- Saving a Security Key 121
- Validate Security Key 122
- Erasing Secure Physical Disks 122
- Hot Spares and Rebuild 125
- Global Hot Spares 125
- Hot Spare Operation 125
- Enclosure Loss Protection 126
- Host-to-Virtual Disk Mapping 128
- Restricted Mappings 136
- Disk Group 137
- Storage Partitioning 140
- Disk Group Expansion 141
- Virtual Disk Expansion 142
- Using Free Capacity 142
- Using Unconfigured Capacity 142
- Disk Group Migration 143
- Import Disk Group 144
- Storage Array Media Scan 145
- Changing Media Scan Settings 146
- Suspending the Media Scan 147
- Snapshot Virtual Disks 149
- Simple Path 152
- About the Simple Path 153
- Advanced Path 156
- Snapshot Repository Capacity 162
- Capacity option is disabled 163
- PowerVault Modular 165
- Snapshot Rollback 167
- Starting a Snapshot Rollback 169
- Resuming a Snapshot Rollback 170
- Canceling a Snapshot Rollback 171
- Virtual Disk Copy 173
- Types of Virtual Disk Copies 174
- Online Copy 175
- Creating a Virtual Disk Copy 178
- Create Copy Wizard 179
- Failed Virtual Disk Copy 179
- Failed RAID Controller Module 180
- Copy Manager 180
- Copying the Virtual Disk 180
- Setting Copy Priority 182
- Stopping a Virtual Disk Copy 183
- Recopying a Virtual Disk 183
- Re-Copying a Virtual Disk 185
- Removing Copy Pairs 186
- Configuration: Device Mapper 191
- Multipath for Linux 191
- Using DM Multipathing Devices 192
- Ready For Use 196
- Limitations and Known Issues 199
- Troubleshooting 200
- Packages 203
- Firmware 204
- EMM Firmware 210
- Technology (SMART) 212
- Management: Installing Array 213
- Components 213
- Front Bezel (Optional) 214
- Hard Drives 215
- Installing a Hard-Drive Blank 216
- Removing a Hard Drive 216
- Installing a Hard Drive 218
- RAID Controller Module 221
- Control Panel 231
- Installing the Control Panel 232
- Backplane 233
- Installing the Backplane 236
- Management: System Interfaces 239
- Array Software 241
- Storage Array Support Data 244
- Event Log 246
- Recovery Guru 247
- Storage Array Profile 248
- Finding Nodes 250
- Using Go To 252
- Condition 253
- Locating a Physical Disk 255
- SMrepassist Utility 259
- Unidentified Devices 260
- Software 262
- Troubleshooting: Your Array 265
- Management Modules 267
- Troubleshooting Hard Drives 270
- Connections 271
- Conditions 273
- Invalid Storage Array 273
- ECC Errors 273
- PCI Errors 274
- Critical Conditions 274
- Noncritical Conditions 274
- Getting Help 275
- Documentation Feedback 276
- Index 275 277
- Index 276 278
- Index 277 279
- Index 278 280
- Index 279 281
- Index 280 282
- Index 281 283
- 282 Index 284
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