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RAID 0 – Stripe
When a disk array is striped, the read and write blocks of data are interleaved between the sectors of multiple
drives. Performance is increased, since the workload is balanced between drives or ―members‖ that form the disk
array. Identical disk drives are recommended for performance as well as data storage efficiency. The disk array’s
data capacity is equal to the number of disk drive members multiplied by the smallest drive's capacity.
Data
Stripe
Disk Driv es
Figure 21: RAID 0, Striping interleaves data across multiple drives
For example, one 100 GB and three 120 GB drives will form a 400 GB (4 x 100 GB) disk array instead of 460
GB.
RAID 0 arrays require one or more physical drives.
Recommended applications: Image Editing, Pre-Press Applications, other applications requiring high bandwidth.
- 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
- 10 EXCEL MERIDIAN DATA 10
- Specifications 10
- Warranty and Support 11
- FCC Statement 11
- CE Statement 11
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- Unpacking the Astra ES 13
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- 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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- 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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- 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
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- (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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