Dell OpenManage Server Administrator Version 7.3 Uživatelský manuál Strana 28
- Strana / 230
- Tabulka s obsahem
- ŘEŠENÍ PROBLÉMŮ
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
RAID 5 characteristics:
• Groups
n
disks as one large virtual disk with a capacity of (
n
-1) disks.
• Redundant information (parity) is alternately stored on all disks.
• When a disk fails, the virtual disk still works, but it is operating in a degraded state. The data is reconstructed
from the surviving disks.
• Better read performance, but slower write performance.
• Redundancy for protection of data.
RAID Level 6 (Striping With Additional Distributed Parity)
RAID 6 provides data redundancy by using data striping in combination with parity information. Similar to RAID 5, the
parity is distributed within each stripe. RAID 6, however, uses an additional physical disk to maintain parity, such that
each stripe in the disk group maintains two disk blocks with parity information. The additional parity provides data
protection in the event of two disk failures. In the following image, the two sets of parity information are identified as P
and Q.
28
- Notes, Cautions, and Warnings 2
- Copyright 2
- Contents 3
- Overview 15
- Supported Controllers 16
- Supported Enclosures 16
- Getting Started 19
- User Privileges 20
- Displaying The Online Help 20
- Common Storage Tasks 21
- Understanding RAID Concepts 23
- RAID Levels 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 Extender Cards 40
- Physical Device Properties 40
- Physical Device Tasks 42
- Exporting The Log 44
- PCIe SSD SubSystem Health 45
- Related Links 46
- Fluid Cache Disks 48
- Fluid Cache Pool 49
- Server Administrator 50
- Messages Reference Guide 50
- Cache I/O Statistics 51
- License Settings 51
- Table 11. License Settings 52
- Storage Properties 53
- Global Tasks 53
- Storage Controller Properties 54
- Storage Components 56
- RAID Controller Features 58
- Read Policy 59
- Write Policy 59
- Cache Policy 60
- Disk Cache Policy 60
- Firmware Or Driver Versions 61
- Controller Health 62
- Server Administrator Readme 63
- Controller Tasks 66
- Rescanning The Controller 67
- Creating A Virtual Disk 67
- Enabling The Controller Alarm 67
- Testing The Controller Alarm 68
- Setting The Rebuild Rate 68
- <mmdd> 70
- Setting The Reconstruct Rate 78
- and Enclosure 80
- Setting The Patrol Read Mode 81
- Server 83
- Managing The Preserved Cache 85
- Encryption Key 86
- Managing The Encryption Key 87
- Converting To Non-RAID Disks 88
- Viewing Available Reports 89
- Viewing Slot Occupancy Report 90
- Enclosures And Backplanes 93
- SMART Thermal Shutdown 94
- Enclosure Physical Disks 94
- Enclosure Fans 94
- Enclosure Power Supplies 95
- Enclosure Temperature Probes 96
- EMM Properties 98
- Enabling The Enclosure Alarm 102
- Setting Asset Data 102
- View Slot Occupancy Report 104
- Enclosure Management 105
- Enclosure Components 106
- Connectors 107
- Connector Health 108
- Rescanning The Connector 109
- Connector Components 111
- Path Health 111
- Tape Drive 113
- RAID Controller Batteries 115
- Battery Tasks 116
- Battery — Available Tasks 116
- Delay The Battery Learn Cycle 117
- For SAS Controllers 120
- Other Disk Procedures 121
- Reference Guide 123
- Physical Disk Tasks 125
- Removing Dead Segments 126
- Preparing To Remove 126
- Rebuilding Data 127
- Canceling A Rebuild 127
- Enabling Revertible Hot Spare 129
- Convert To RAID Capable Disk 130
- Convert To Non-RAID Disk 130
- Virtual Disks 131
- Creating Virtual Disks 134
- And Capacity Expansion 135
- Virtual Disk Properties 139
- Virtual Disk Tasks 141
- Reconfiguring A Virtual Disk 142
- s*(n-1) 148
- Span Edit 151
- Slow And Fast Initialize 154
- Deleting A Virtual Disk 155
- Renaming A Virtual Disk 156
- Split Mirror 157
- Unmirror 158
- System To Another 163
- Understanding Hot Spares 165
- Controllers 168
- Managing The CacheCade 171
- CacheCade Properties 172
- Creating A CacheCade 172
- Resizing The CacheCade 173
- Renaming The CacheCade 173
- Deleting The CacheCade 173
- Troubleshooting 175
- Drivers And Firmware 176
- Isolate Hardware Problems 176
- Replacing A Failed Disk 176
- Replacing The Disk 177
- Assigning A Hot Spare 177
- Virtual Disk Troubleshooting 178
- Cannot Create A Virtual Disk 179
- Redundant Virtual Disks 180
- PCIe SSD Troubleshooting 183
- Fluid Cache For DAS 184
- Through operational mode 185
- Frequently Asked Questions 187
- Which Controllers Do I Have? 188
- How Do I Turn Off An Alarm 188
- Supported Features 189
- S300 Controllers 218
- Enclosure And Backplane Tasks 222
- Components 225
- Not Included) 226
- Failed Or Rebuilding 227
- Connection Removed 228
- Enclosure 229
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