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Appendix B: Understanding RAID ● 67
Drive segment size is limited to the size of the smallest disk drive in the array. For instance, an
array with two 250 GB disk drives and two 400 GB disk drives can create two mirrored drive
segments of 250 GB, for a total of 500 GB for the array, as shown in the following figure.
Selecting the Best RAID Level
Use this table to select the RAID levels that are most appropriate for the logical drives on your
storage space, based on the number of available disk drives and your requirements for
performance and reliability.
Disk drive usage, read performance, and write performance depend on the number of drives in
the logical drive. In general, the more drives, the better the performance.
Disk Drive 1
Disk Drive 2
Disk Drive 3
Disk Drive 4
250 GB
250 GB
400 GB
400 GB
Disk Drives in Logical Drive
Disk Drive 1
Disk Drive 2
Disk Drive 3
Disk Drive 4
RAID 10 Lo
g
ical Drive = 500 GB
1
2
1
2
Not Used
Not Used
3
4
3
4
500
499
500
499
...
...
...
...
Unused Space: 150 GB
Unused Space: 150 GB
Drive Segment Size (Smallest Disk Drive)
RAID
Level Redundancy
Disk Drive
Usage
Read
Performance
Write
Performance
Built-in
Hot Spare
Minimum
Disk
Drives
RAID 0 No 100% www www No 2
RAID 1Yes50%wwwwNo2
RAID
10
Yes 50% ww ww No 4
- SAS and SATA 1
- HostRAID Controller 1
- Copyright 2
- Trademarks 2
- Disclaimer 2
- Adaptec Customer Support 3
- Canadian Compliance Statement 5
- Contents 6
- 5 Getting Started 7
- 6 Creating a Bootable Array 7
- 9 Managing Your Storage Space 8
- 10 Solving Problems 8
- A Introduction to SAS 8
- BUnderstanding RAID 8
- C Using the ARC Utility 9
- F Safety Information 10
- G Technical Specifications 10
- Glossary 10
- About This Guide 11
- How to Find More Information 12
- In this chapter 14
- HostRAID Controller Features 15
- External SAS Connector 18
- Internal SAS Connector 18
- 3.3V PCI-X Connector 18
- Mounting bracket 18
- PCIe X1 connector 23
- External SATA connectors 23
- J1 LED Connector 23
- Kit Contents and System 24
- Requirements 24
- Kit Contents 25
- System Requirements 25
- Disk Drives 26
- Before You Begin 27
- Selecting Disk Drives 28
- Selecting SAS Cables 28
- SAS or SATA disk drives 29
- Selecting SATA Cables 30
- Connecting to a Backplane 31
- Disk drives on 32
- Controller connected 32
- Setting the Boot Controller 33
- Next Steps 34
- Getting Started 35
- Choosing a RAID Level 36
- Choosing Installation Options 36
- Basic Installation Steps 36
- Creating a Bootable Array 38
- Creating an Array 39
- Making Your Array Bootable 40
- Creating a Driver Disk 42
- Installing with Windows 42
- Installing with Red Hat Linux 43
- Installing with SUSE Linux 43
- Installing with NetWare 44
- Operating System 45
- Installing on Windows Vista 47
- Installing on NetWare 47
- Managing Your Storage Space 49
- About Adaptec Storage Manager 50
- About the ARC Utility 51
- Which Utility Should I Use? 51
- Solving Problems 52
- Troubleshooting Checklist 53
- Resetting the Controller 54
- Understanding RAID 56
- RAID Technology Overview 57
- RAID 0 (Non-RAID Arrays) 57
- RAID 1 Arrays 58
- RAID 10 Arrays 58
- Selecting the Best RAID Level 59
- Introduction to SAS 60
- What is SAS? 61
- What’s a Phy? 62
- What’s a SAS Port? 62
- What’s a SAS Address? 63
- What’s a SAS Connector? 63
- What do SAS Cables Look Like? 63
- Direct-Attach Connections 64
- Backplane Connections 64
- SAS Expander Connections 64
- SAS DomainSAS Domain 65
- Using the ARC Utility 67
- Running the ARC Utility 68
- Creating and Managing Arrays 68
- RAID Via 69
- When Appropriate 69
- Managing Arrays 70
- Adding/Deleting Hot Spares 71
- Using SerialSelect 72
- SerialSelect Options 73
- Using SATASelect 74
- SATASelect Options 75
- Locating Disk Drives 76
- Identifying Disk Drives 76
- Viewing the Event Log 77
- In this Appendix 78
- Compatibility Information 79
- Introduction 79
- Running the AFU 80
- A:\> AFU HELP 81
- A:\> AFU /? 81
- Connector Reference 86
- Aggregate LED signals only 87
- Pin Number Signal Description 89
- Safety Information 91
- Technical Specifications 92
- Environmental Specifications 93
- DC Power Requirements 93
- Current Requirements 93
- Glossary ● 96 95
- Glossary ● 97 96
- Glossary ● 98 97
- Glossary ● 99 98
- Glossary ● 100 99
- Index ● 95 101
- Index ● 96 102
- Milpitas, CA 95035 USA 103
- Adaptec, Inc 103
- 691 South Milpitas Boulevard 103
Verwandte Produkte und Handbücher für Schnittstellenkarten / Adapter Adaptec SATA II RAID 1220SA
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