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Chapter 6: Technology Background
159
RAID 5 – Block Striping with Distributed Parity
RAID 5 organizes block data and parity data across the physical drives.
Generally, RAID Level 5 tends to exhibit lower random write performance due to
the heavy workload of parity recalculation for each I/O. RAID 5 is generally
considered to be the most versatile RAID level. It works well for file, database,
application and web servers.
Figure 4. RAID 5 stripes all drives with data and parity information
The capacity of a RAID 5 logical drive equals the smallest physical drive times
the number of physical drives, minus one. Hence, a RAID 5 logical drive with four
100 GB physical drives will have a capacity of 300 GB. A RAID 5 logical drive
with two 120 GB physical drives and one 100 GB physical drive will have a
capacity of 200 GB.
RAID 5 is generally considered to be the most versatile RAID level.
A RAID 5 on SuperTrak consists of 3 to 16 physical drives.
Data
Blocks
Distributed Parity
Physical Drives
- EX4650, EX8650 1
- EX8654, EX8658 1
- Copyright 2
- Trademarks 2
- Recommendations 2
- Contents 11
- Chapter 1: Introduction 13
- Product Overview 14
- Operating System Support 15
- Browser Support 15
- Key Features and Benefits 16
- Specifications 18
- Chapter 2: Installation 19
- Installing the SuperTrak Card 20
- Scenario 5: SAS Expanders 25
- Choosing the Physical Drives 26
- Installing WebPAM PRO 32
- Internet Browser 33
- Logging into WebPAM PRO 49
- Login Screen 50
- Setting up WebPAM PRO 51
- Chapter 3: Installing Drivers 53
- Driver Diskette for Windows 54
- USB Memory Stick for Windows 54
- Driver Diskette for Linux 54
- Windows Vista 55
- Existing System 56
- Windows Server 2003 57
- Windows XP 59
- Windows 2000 61
- New OS Installation 63
- SuSE Linux Enterprise 10.1 64
- SuperTrak BIOS 65
- Main Menu 68
- Controller Selection 69
- Controller Information 70
- Physical Drive Management 71
- Disk Array Management 73
- Changing Disk Array Settings 75
- Logical Drive Management 76
- Rebuilding the Logical Drive 81
- RAID 1, 5, 6, 10, 50 and 60 83
- Spare Drive Management 85
- Changing Spare Drive Settings 86
- Deleting a Spare Drive 87
- Background Activity 88
- Event Log 89
- Clearing the Event Logs 90
- Time Sync 91
- Miscellaneous 92
- Logging in over the Network 96
- Accessing the Interface 98
- Using the Header 99
- Using Tree View 99
- Using Management View 100
- Choosing a Display Language 101
- Viewing the Event Frame 101
- Saving the Event Frame 102
- Deleting the Event Frame 102
- Viewing the Storage Network 102
- Logging out of WebPAM PRO 103
- Managing Users 104
- Making Your Own User Settings 105
- Changing a User’s Password 105
- Changing Your Own Password 105
- Creating a User 106
- Deleting a User 106
- Adding a Subsystem or Host 108
- Deleting a Subsystem or Host 109
- Setting User Privilege 109
- Managing Software Services 111
- Restarting the Tomcat Server 112
- Setting up Email Service 112
- Setting up Extended SMTP 113
- Sending A Test Email Message 113
- Changing CIM Client Settings 114
- Changing CIM Server Settings 114
- Managing the Host 115
- Managing the Subsystem 116
- Clearing Statistical Data 117
- Updating the Firmware 117
- Checking Subsystem Health 118
- Viewing the Runtime Event Log 118
- Saving the Runtime Event Log 119
- Viewing the NVRAM Event Log 119
- Saving the NVRAM Event Log 120
- Clearing the NVRAM Event Log 120
- Running Background Activities 122
- Running Media Patrol 122
- Running PDM 123
- Viewing Scheduled Activities 123
- Scheduling an Activity 123
- Deleting a Scheduled Activity 125
- Viewing System Configuration 125
- Managing the Controller 127
- Viewing Controller Statistics 129
- Making Controller Settings 129
- Clearing an Orphan Watermark 130
- Viewing Battery Information 130
- Silencing the Buzzer 131
- Making Buzzer Settings 131
- Testing the Buzzer 131
- Viewing Buzzer Information 132
- Managing Enclosures 133
- Managing Physical Drives 134
- Promise Enclosures 135
- Adjustable Items 136
- Managing Disk Arrays 139
- Creating a Disk Array 140
- Deleting a Disk Array 146
- Making Disk Array Settings 147
- Creating a Logical Drive 148
- Deleting a Logical Drive 149
- Migrating a Disk Array 150
- Rebuilding a Disk Array 151
- Running PDM on a Disk Array 152
- Transitioning a Disk Array 153
- Managing Logical Drives 155
- Locating a Logical Drive 156
- Logical Drive Status 157
- Logical Drive Synchronization 157
- Initializing a Logical Drive 158
- Running Redundancy Check 159
- Managing Spare Drives 161
- Creating a Spare Drive 162
- Deleting Spare Drive 163
- Making Spare Drive Settings 163
- Running Spare Check 164
- Introduction to RAID 167
- RAID 0 – Stripe 168
- RAID 1 – Mirror 169
- RAID 1E – Enhanced Mirror 170
- RAID 10 – Mirror / Stripe 173
- RAID 50 Axles 175
- RAID 60 Axles 178
- Choosing a RAID Level 180
- Choosing Stripe Block Size 184
- Choosing Sector Size 184
- Choosing Cache Policy 185
- Capacity Coercion 186
- Initialization 187
- Hot Spare Drive(s) 187
- RAID Level Migration 188
- Delete and Recreate 195
- Media Patrol 196
- Transition 197
- Automatic Transition 199
- Manual Transition 199
- When a Physical Drive Fails 201
- With a Hot Spare Drive 203
- Without a Hot Spare Drive 203
- Rebuild Operation 203
- After a successful rebuild: 204
- • The alarm is silent 204
- Chapter 7: Support 205
- Drive Issues 206
- Post-Installation 208
- Contacting Technical Support 209
- The Netherlands 210
- Limited Warranty 211
- Your Responsibilities 213
- (below) 218
- Appendix B: Upgrades 219
- Updating WebPAM PRO 220
- Installing the BBU 222
- Aggregate 225
- LED activity = Low 225
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