Dell PowerVault MD3200i Manuel d'utilisateur Page 45
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Planning: MD3200i Series Storage Array Terms and Concepts 45
Virtual Disk Operations Limit
The maximum number of active, concurrent virtual disk processes per RAID
controller module installed in the storage array is four. This limit is applied to
the following virtual disk processes:
• Background initialization
• Foreground initialization
• Consistency check
•Rebuild
•Copy back
If a redundant RAID controller module fails with existing virtual disk
processes, the processes on the failed controller are transferred to the peer
controller. A transferred process is placed in a suspended state if there are four
active processes on the peer controller. The suspended processes are resumed
on the peer controller when the number of active processes falls below four.
Disk Group Operations
RAID Level Migration
You can migrate from one RAID level to another depending on your
requirements. For example, fault-tolerant characteristics can be added to a
stripe set (RAID 0) by converting it to a RAID 5 set. MDSM provides
information about RAID attributes to assist you in selecting the appropriate
RAID level. You can perform a RAID level migration while the system is still
running and without rebooting, which maintains data availability.
Segment Size Migration
Segment size refers to the amount of data (in KB) that the storage array
writes on a single physical disk in a virtual disk before writing data on the next
physical disk. Valid values for the segment size are 8 KB, 16 KB, 32 KB, 64 KB,
128 KB, 256 KB, and 512 KB.
Dynamic segment size migration enables the segment size of a given virtual
disk to be changed. A default segment size is set when the virtual disk is
created, based on such factors as the RAID level and expected usage. You can
change the default value if segment size usage does not match your needs.
book.book Page 45 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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