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RAID 10
Advantages
Disadvantages
Implemented as a mirrored disk array
whose segments are RAID 0 disk
arrays
High I/O rates are achieved thanks to
multiple stripe segments
Very high disk overhead - uses only
50% of total capacity
Recommended Applications for RAID 10
• Imaging applications
• Database servers
• General fileserver
RAID 50
Advantages
Disadvantages
High Read data transaction rate
Medium Write data transaction rate
Good aggregate transfer rate
High reliability
Supports large volume sizes
Higher disk overhead than RAID 5
Recommended Applications for RAID 50
• File and Application servers
• Transaction processing
• Office application with many users accessing small files
RAID 60
Advantages
Disadvantages
High Read data transaction rate
Medium Write data transaction rate
Good aggregate transfer rate
Safest RAID level
High disk overhead – equivalent of two
drives used for parity
Slightly lower performance than RAID
50
Recommended Applications for RAID 60:
• Accounting and Financial
• Database servers
• Any application requiring very high availability
- SecurStor Astra ES 1
- Copyright ©2007 2
- Trademarks 2
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- 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
- 10 EXCEL MERIDIAN DATA 10
- Specifications 10
- Warranty and Support 11
- FCC Statement 11
- CE Statement 11
- 12 EXCEL MERIDIAN DATA 12
- 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
- 20 EXCEL MERIDIAN DATA 20
- Connecting the Power 20
- Logging into Astra GUI 21
- 22 EXCEL MERIDIAN DATA 22
- Selecting a Language 22
- Perusing the Interface 22
- Logging out of Astra GUI 23
- 24 EXCEL MERIDIAN DATA 24
- Working with Subsystems 24
- 26 EXCEL MERIDIAN DATA 26
- Clearing NVRAM Events 27
- 28 EXCEL MERIDIAN DATA 28
- Viewing Lock Status 29
- Setting the Lock 29
- 30 EXCEL MERIDIAN DATA 30
- Managing Users 30
- Making User Settings 31
- 32 EXCEL MERIDIAN DATA 32
- Deleting a User 33
- Viewing User Sessions 33
- Logging out Other Users 33
- 34 EXCEL MERIDIAN DATA 34
- 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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- 60 EXCEL MERIDIAN DATA 60
- 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
- 80 EXCEL MERIDIAN DATA 80
- Introduction to RAID 81
- 82 EXCEL MERIDIAN DATA 82
- 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
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- Appendix A: SNMP MIB Files 137
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