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Appendix D: Understanding RAID ● 164
Understanding Drive Segments
A drive segment is a disk drive or portion of a disk drive that is used to
create a logical device. A disk drive can include both RAID segments
(segments that are part of a logical drive) and available segments. Each
segment can be part of only one logical device at a time. If a disk drive is
not part of any logical device, the entire disk is an available segment.
RAID 0 (Non-RAID Logical Drives)
A logical drive with RAID 0 includes two or more disk drives
(maximum twelve) and provides data striping, where data is distributed
evenly across the disk drives in equal-sized sections.
RAID 0 logical drives do not maintain redundant data, so they offer no
data protection. However, compared to an equal-sized group of
independent disks, a RAID 0 logical drive provides improved I/O
performance.
Drive segment size is limited to the size of the smallest disk drive in the
logical drive. For instance, a logical drive with two 250 GB disk drives
and two 400 GB disk drives can create a RAID 0 drive segment of 250
GB, for a total of 1000 GB for the volume, as shown below.
D
isk Drive 1
D
isk Drive 2
D
isk Drive 3
D
isk 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 0 Logical Drive = 1000 GB
1
2
3
4
Not Used
Not Used
5
6
7
8
1000
999
998
997
...
...
...
...
Unused Space: 150 G
B
Unused Space: 150 G
B
Drive Segment Size (Smallest 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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