Dell OpenManage Server Administrator Version 7.4 Bedienungsanleitung Seite 26
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When a physical disk in a concatenated or spanned volume fails, the entire volume becomes unavailable.
Because the data is not redundant, it cannot be restored by rebuilding from a mirrored disk or parity
information. Restoring from a backup is the only option.
Because concatenated volumes do not use disk space to maintain redundant data, they are more cost-
efficient than volumes that use mirrors or parity information. A concatenated volume may be a good
choice for data that is temporary, easily reproduced, or that does not justify the cost of data redundancy.
In addition, a concatenated volume can easily be expanded by adding an additional physical disk.
• Concatenates n disks as one large virtual disk with a capacity of n disks.
• Data fills up the first disk before it is written to the second disk.
• No redundant data is stored. When a disk fails, the large virtual disk fails.
• No performance gain.
• No redundancy.
RAID Level 0 (Striping)
RAID 0 uses data striping, which is writing data in equal-sized segments across the physical disks. RAID 0
does not provide data redundancy.
26
- Notes, Cautions, and Warnings 2
- Copyright 2
- Contents 3
- Overview 15
- Supported Controllers 16
- Supported Enclosures 17
- Getting Started 19
- User Privileges 20
- Displaying The Online Help 21
- Common Storage Tasks 21
- Understanding RAID Concepts 23
- Performance 24
- Concatenation 25
- RAID Level 0 (Striping) 26
- RAID Level 1 (Mirroring) 27
- Storage Health 35
- Hot Spare Protection Policy 35
- Storage Component Severity 36
- Alerts Or Events 37
- What Is PCIe SSD? 39
- PCIe SSD Features 39
- PCIe SSD SubSystem Properties 39
- PCIe Extender Cards 40
- Physical Device Properties 41
- Physical Device Tasks 43
- Exporting The Log 44
- PCIe SSD 45
- PCIe SSD SubSystem Health 47
- Fluid Cache Disks 50
- Fluid Cache Pool 51
- Cache I/O Statistics 53
- License Settings 54
- Storage Properties 57
- Global Tasks 57
- Storage Controller Properties 58
- RAID Controller Features 62
- Read Policy 63
- Write Policy 63
- Cache Policy 64
- Disk Cache Policy 64
- Non-RAID SCSI Controllers 65
- Non-RAID SAS Controllers 65
- Firmware Or Driver Versions 66
- Controller Health 67
- Controller Tasks 71
- Rescanning The Controller 72
- Creating A Virtual Disk 72
- Enabling The Controller Alarm 72
- Testing The Controller Alarm 73
- Setting The Rebuild Rate 73
- Setting The Reconstruct Rate 84
- Setting The Patrol Read Mode 86
- To Set The Patrol Read Mode 87
- Managing The Preserved Cache 91
- Encryption Key 92
- Managing The Encryption Key 93
- Converting To Non-RAID Disks 94
- Viewing Available Reports 95
- Viewing Slot Occupancy Report 96
- 9 Hardware Controller 99
- Enclosures And Backplanes 103
- SMART Thermal Shutdown 104
- Enclosure Physical Disks 104
- Enclosure Fans 104
- Enclosure Power Supplies 105
- Enclosure Temperature Probes 106
- EMM Properties 109
- Enclosure And Backplane Tasks 112
- Enabling The Enclosure Alarm 113
- Setting Asset Data 113
- Enclosure — Available Tasks 113
- Available Reports 115
- View Slot Occupancy Report 115
- Enclosure Management 116
- Enclosure Components 117
- Connectors 119
- Connector Health 120
- Rescanning The Connector 121
- Path Health 123
- Connector Components 123
- Tape Drive 125
- RAID Controller Batteries 127
- Battery Tasks 128
- Battery — Available Tasks 128
- Delay The Battery Learn Cycle 129
- For SAS Controllers 132
- Other Disk Procedures 133
- Physical Disk Tasks 138
- Removing Dead Segments 139
- Preparing To Remove 139
- Rebuilding Data 139
- Canceling A Rebuild 140
- Enabling Revertible Hot Spare 142
- Convert To RAID Capable Disk 143
- Convert To Non-RAID Disk 143
- Virtual Disks 145
- Creating Virtual Disks 148
- Virtual Disk Properties 153
- Virtual Disk Tasks 156
- Reconfiguring A Virtual Disk 157
- Restoring Dead Segments 157
- Replacing A Member Disk 159
- Encrypting A Virtual Disk 159
- Span Edit 168
- Slow And Fast Initialize 172
- Deleting A Virtual Disk 173
- Renaming A Virtual Disk 174
- Split Mirror 175
- Unmirror 176
- One System To Another 181
- Understanding Hot Spares 183
- S300 Controllers 186
- Managing The CacheCade 189
- CacheCade Properties 190
- Creating A CacheCade 190
- Resizing The CacheCade 191
- Renaming The CacheCade 191
- Deleting The CacheCade 191
- Troubleshooting 193
- Drivers And Firmware 194
- Isolate Hardware Problems 194
- Replacing A Failed Disk 194
- Replacing The Disk 195
- Assigning A Hot Spare 195
- Virtual Disk Troubleshooting 196
- Cannot Create A Virtual Disk 197
- Is Degraded 199
- PCIe SSD Troubleshooting 201
- Fluid Cache For DAS 202
- Frequently Asked Questions 205
- Which Controllers Do I Have? 206
- How Do I Turn Off An Alarm 206
- Concatenation Performance 207
- Supported Features 209
- Controllers 217
- H200 Controllers 233
- S110, And S300 Controllers 242
- Storage Components 249
- Not Included) 251
- Power Connection Removed 252
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