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RAID 6 – Block and Double Parity Stripe
RAID level 6 stores dual parity data is rotated across the physical drives along with the block data. A RAID 6 disk
array can continue to accept I/O requests when any two physical drives fail.
Double Distributed (Wide-space Q+Q) Parity
physical driv es
Data
Blocks
Figure 25: RAID 6, stripes all drives with data and double parity
The total capacity of a RAID 6 disk array is the smallest physical drive times the number of physical drives,
minus two.
Hence, a RAID 6 disk array with six 100 GB hard drives will have a capacity of 400 GB. A disk logical drive with
four100 GB hard drives will have a capacity of 200 GB.
RAID 6 becomes more capacity efficient in terms of physical drives as the number of physical drives increases.
RAID 6 offers double fault tolerance. Your logical drive remains available when up to two physical drives fail.
RAID 6 is generally considered to be the safest RAID level, except for RAID 60.
RAID 6 requires a minimum of four physical drives and a maximum of 16.
Recommended applications: Accounting, financial, and database servers; any application requiring very high
availability.
- SecurStor Astra ES 1
- Copyright ©2007 2
- Trademarks 2
- 4 EXCEL MERIDIAN DATA 4
- Table of Contents 4
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- About This Manual 7
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- Astra ES Overview 8
- Architectural Description 9
- Features and Benefits 9
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- Specifications 10
- Warranty and Support 11
- FCC Statement 11
- CE Statement 11
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- Unpacking the Astra ES 13
- 14 EXCEL MERIDIAN DATA 14
- Mounting Astra ES in a Rack 14
- Installing Disk Drives 15
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- Configuring JBOD expansion: 17
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- Configuring Cascaded Storage 19
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- Connecting the Power 20
- Logging into Astra GUI 21
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- Selecting a Language 22
- Perusing the Interface 22
- Logging out of Astra GUI 23
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- Working with Subsystems 24
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- Clearing NVRAM Events 27
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- Viewing Lock Status 29
- Setting the Lock 29
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- Managing Users 30
- Making User Settings 31
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- Deleting a User 33
- Viewing User Sessions 33
- Logging out Other Users 33
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- 36 EXCEL MERIDIAN DATA 36
- Managing SAS Connections 37
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- Managing Storage Services 39
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- Managing Software Services 40
- Managing SLP Settings 41
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- Managing SNMP Settings 43
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- Exporting the User Database 45
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- Importing a User Database 46
- Viewing the Controllers 48
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- Managing Enclosures 51
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- Reconditioning a Battery 53
- Managing Buzzer Settings 53
- Testing the Buzzer 53
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- Managing Physical Drives 54
- Adjustable Items 55
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- Managing Disk Arrays 57
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- Managing Disk Array Settings 61
- Creating a Logical Drive 61
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- Rebuilding a Disk Array 63
- Running PDM on a Disk Array 63
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- Managing Logical Drives 65
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- Running Redundancy Check 67
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- Managing Spare Drives 69
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- Chapter 4: Maintenance 73
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- Replacing a Power Supply 74
- Remove and Replace a Blower 75
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- Replacing a Cache Battery 77
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- Replacing a RAID Controller 78
- Single Controller Subsystem 79
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- Introduction to RAID 81
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- Data Mirror 83
- Disk Driv es 83
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- Distributed Parity 85
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- Data Stripe 87
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- 90 EXCEL MERIDIAN DATA 90
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- Choosing a RAID Level 92
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- Choosing Stripe Size 95
- Choosing Sector Size 95
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- Cache Policy 96
- LUN Affinity 96
- Capacity Coercion 97
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- RAID Level Migration 99
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- Media Patrol 100
- Transition 101
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- Automatic Transition 103
- Manual Transition 103
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- Chapter 6: Troubleshooting 105
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- Status LED 108
- Dirty Cache LED 108
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- Event Notification Response 110
- 112 EXCEL MERIDIAN DATA 112
- (Enclosure Events) 113
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- 116 EXCEL MERIDIAN DATA 116
- (Media Patrol Events) 117
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- (PDM Events) 119
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- (Physical Disk Events) 121
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- (PSU Fans Events) 123
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- (Rebuild Events) 125
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- (Spare Check Events) 127
- (Spare Drives Events) 127
- (SMART Events) 127
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- (Synchronization Events) 129
- (System Events) 129
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- Incomplete Array 132
- Physical Drive Problems 132
- Physical Drive Failed 133
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- Enclosure Problems 134
- 136 EXCEL MERIDIAN DATA 136
- Appendix A: SNMP MIB Files 137
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