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Appendix D: Understanding RAID ● 165
RAID 1 Logical Drives
A RAID 1 logical drive is built from two disk drives, where one disk
drive is a mirror of the other (the same data is stored on each disk
drive). Compared to independent disk drives, RAID 1 logical drives
provide improved performance, with twice the read rate and an equal
write rate of single disks. However, capacity is only 50 percent of
independent disk drives.
If the RAID 1 logical drive is built from different- sized disk drives, the
free space, drive segment size is the size of the smaller disk drive, as
shown below.
D
isk Drive 1
D
isk Drive 2
250 GB
400 GB
Disk Drives in Logical Drive
Disk Drive 1
Disk Drive 2
RAID 1 Logical Drive = 250 GB
Not Used
Unused Space: 150 G
B
1 – 250
1 – 250
Drive Segment Size (Smaller Disk Drive)
- Storage Manager 1
- Copyright 2
- Trademarks 2
- Disclaimer 2
- Adaptec Customer Support 3
- Software License Agreement 4
- Contents 7
- Contents ● 8 8
- Contents ● 9 9
- 10 Protecting Your Data 10
- 12 Managing Tasks 11
- 13 Managing Remote Systems 12
- 16 Solving Problems 12
- A Configuring SNMP Support 13
- D Understanding RAID 14
- Glossary 14
- About This Guide 15
- Introduction to Adaptec 17
- About Adaptec Storage Manager 18
- System Requirements 19
- Adding Enhanced Features 22
- 3 Click OK to confirm 23
- Getting Started Checklist 24
- Step 1: Installing Adaptec 25
- Installing on Windows 26
- Option Required Values 27
- Adaptec Storage Manager\”” 28
- SNMPSupport,ASMReadme” 28
- Installing on Linux 29
- JAVA -VERSION 30
- Step 2: Starting Adaptec 31
- LOAD RAIDMAN command 33
- Starting the Agent on Windows 34
- LOAD RaidAgnt 35
- Administrator Level 36
- User Level 37
- Guest Level 37
- Logging Back In 39
- Step 3: Exploring Adaptec 40
- Navigating the Main Window 41
- Using Enterprise View 41
- Using Physical Devices View 42
- Using Logical Devices View 43
- Full Size Capacity 45
- View button 45
- Relative Size Capacity 45
- Checking System Status 46
- Getting Help 47
- Step 4: Building Your 48
- Storage Space 48
- Next Steps 52
- 4 Select a RAID level 53
- 5 Click Next 53
- Tab for second logical drive 55
- Building a RAID Volume 57
- 7 Click Next 58
- RAID Controller Support 60
- Managing Your Storage Space 60
- Step 5: Customizing 61
- Adaptec Storage Manager 61
- Logging In to Remote Systems 62
- Creating Display Groups 64
- 4 Click OK 66
- 3 Click Save changes 69
- Running Adaptec Storage 71
- Manager from the CD 71
- Bootable-CD Mode Limitations 72
- Managing Logical Drives 74
- Available 75
- Creating Logical Drives 76
- Fine-tuning Logical Drives 79
- Changing the Stripe Size 80
- Verifying Logical Drives 82
- 4 Click Next 86
- Deleting a Logical Drive 90
- Working with Hot Spares 91
- Hot spare 92
- Removing a Hot Spare 94
- Protecting Your Data 96
- Creating a Snapshot 97
- Deleting a Snapshot 98
- Enabling Copyback 99
- Monitoring Your Storage 100
- Monitoring Options 101
- Clearing the Event Log 103
- Notifications Tab 105
- Sending a Test Event 107
- ● To add a system to the 108
- Disabling Event Notifications 112
- 1 Note this information: 113
- Managing the Email List 116
- ● Address of your SMTP server 119
- Disabling Email Notifications 120
- Testing the Alarm 122
- Viewing Component Properties 123
- Managing Tasks 124
- Scheduling a Task 125
- 2 Click Schedule 126
- 5 Click Apply 126
- Opening the Task Manager 127
- Monitoring Tasks 128
- Modifying a Task 130
- Deleting a Task 131
- Disabling the Task Manager 132
- Managing Remote 133
- Introduction 134
- Removing a Remote System 134
- Working with Display 135
- Viewing Display Group Status 137
- Renaming a Display Group 138
- Deleting a Display Group 139
- Managing Controllers 140
- Rescanning a Controller 141
- Registering New Controllers 141
- Viewing Controller Properties 142
- Before You Begin 143
- Managed systems 144
- Solving Problems 147
- ...on Controller 1 148
- ...and logical drive is 149
- Disk drive shows 149
- Failed status 149
- ...hot spare takes over 149
- Rebuilding Logical Drives 152
- Solving Notification Problems 152
- Creating an Archive File 153
- Configuring SNMP 154
- Quick Answers to 157
- Common Questions 157
- How do I...? 158
- Schedule a task? 159
- Find the Task Manager? 159
- Buttons and Icons 161
- At-a-Glance 161
- Icon Descriptions 162
- Icon Description 162
- Button Click to... More on 163
- Understanding RAID 164
- Understanding Drive Segments 165
- RAID 1 Logical Drives 166
- RAID 10 Logical Drives 168
- RAID 5 Logical Drives 169
- RAID 5EE Logical Drives 170
- RAID 50 Logical Drives 171
- RAID 6 Logical Drives 172
- RAID 60 Logical Drives 173
- Selecting the Best RAID Level 174
- Glossary ● 180 181
- Adaptec, Inc 191
- 691 South Milpitas Boulevard 191
- Milpitas, CA 95035 USA 191
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