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36 Planning: RAID Controller Modules
Write-Through Cache
In write-through cache, data is written to the physical disk before completion
status is returned to the host operating system. Write-through cache is
considered more robust than write-back cache, since a power failure is less
likely to cause loss of data. The RAID controller automatically switches to
write-through if either cache mirroring is disabled or the battery is missing or
there is a fault condition.
book.book Page 36 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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