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Oceniono. / 5. Na podstawie oceny klientów
RAID 5 Characteristics:
l Groups n disks as one large virtual disk with a capacity of (n-1) disks.
l Redundant information (parity) is alternately stored on all disks.
l 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.
l Better read performance, but slower write performance.
l Redundancy for protection of data.
Related Information:
See the following:
l "Organizing Data Storage for Availability and Performance"
l "Comparing RAID Level and Concatenation Performance"
l "Controller-supported RAID Levels"
l "Number of Physical Disks per Virtual Disk"
l "Maximum Number of Virtual Disks per Controller"
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 Figure3-5, the two sets of parity information are identified as "P" and "Q".
Figure 3-5. RAID 6
RAID 6 Characteristics:
- Notes and Cautions 1
- Supported Features 2
- SATA1.5/6ch Controllers 6
- Battery Tasks 10
- Connector Tasks 10
- Physical Disk Tasks 10
- Virtual Disk Tasks 11
- Virtual Disk Specifications 11
- Supported RAID Levels 12
- Enclosure Support 13
- Controller Tasks 13
- Permanently Degraded 26
- Rebuilding 27
- Physical Disks 31
- Other Disk Procedures 32
- Remove Dead Segments 35
- Prepare to Remove 35
- Initialize 36
- Rebuild 36
- Cancel Rebuild 36
- Online and Offline 37
- Revertible Hot Spare 38
- Instant Secure Erase 38
- RAID Controller Batteries 40
- Battery Delay Learn Cycle 43
- BIOS Terminology 44
- Connectors 45
- Connector Health 46
- Connector Information 47
- Connector Components 47
- Connector Properties 47
- Path Health 48
- Related Tasks 49
- Controllers 50
- RAID Controller Features 51
- Read Policy 52
- Write Policy 52
- Cache Policy 52
- Disk Cache Policy 53
- Non-RAID SCSI Controllers 54
- Firmware/Driver Versions 55
- Controller Health 55
- Controller Information 56
- Controller Components 56
- Controller Properties 56
- Set Rebuild Rate 60
- Reset Configuration 61
- Export Log 61
- Set Check Consistency Rate 67
- Set Reconstruct Rate 68
- Set Patrol Read Mode 70
- Start and Stop Patrol Read 71
- Manage Preserved Cache 72
- Manage Security Key 73
- Enclosures and Backplanes 75
- SMART Thermal Shutdown 76
- Enclosure Management 77
- Enclosure Tasks 79
- Set Asset Data 81
- EMM Properties 82
- Fan Properties 83
- Power Supply Properties 83
- Related information: 87
- Getting Started 88
- Displaying the Online Help 89
- Common Storage Tasks 89
- Understanding Hot Spares 91
- 6/I Controllers 91
- S300 Controllers 92
- Required Conditions 96
- Moving the Disks 97
- Overview 105
- Supported Controllers 106
- Supported Enclosures 107
- Storage Health 108
- Storage Component Severity 108
- Alerts or Events 109
- Related Information: 110
- Storage Properties 111
- Global Tasks 111
- Storage Controllers 112
- Storage Components 113
- What Is RAID? 114
- Concatenation 115
- RAID Level 0 (Striping) 116
- RAID Level 1 (Mirroring) 117
- RAID 5 Characteristics: 118
- RAID 6 Characteristics: 118
- RAID 50 Characteristics: 119
- RAID 60 Characteristics: 120
- RAID 10 Characteristics: 121
- No-RAID 123
- Troubleshooting 124
- Replacing a Failed Disk 125
- A Rebuild Does Not Work 127
- Nonredundant Virtual Disks 128
- Virtual Disks 132
- Creating Virtual Disks 134
- Expansion 135
- SATA1.5/2s Controllers 136
- Recommendations 137
- Virtual Disk Properties 138
- Connector 0 146
- Physical Disks Selected 146
- Span Edit 147
- Controllers 149
- Considerations for Format 150
- Virtual Disk Task: Delete 151
- Virtual Disk Task: Rename 151
- Split Mirror 152
- Unmirror 153
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