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14 en | RAID Functions: Introduction SCSI to SATA RAID Subsystem | Administrator’s Manual
F.01U.027.802 | V1 | 2006.11 Bosch Security Systems
1.3.6 RAID3
Disk Striping with Dedicated Parity Disk
RAID3 performs Block Striping with Dedicated Parity. One drive member is dedicated to stor-
ing the parity data. When a drive member fails, the controller can recover/regenerate the lost
data of the failed drive by comparing and re-calculating data on the remaining drives.
Fig. 1.7 FRAID3
1.3.7 RAID5
Striping with Interspersed Parity
RAID5 is similar to RAID3 but the parity data is not stored in a dedicated hard drive. Parity
information is interspersed across the drive array. In the event of a drive failure, the controller
can recover/regenerate the lost data of the failed drive by comparing and re-calculating data
on the remaining drives.
Fig. 1.8 RAID5
RAID (0+1)
Minimum Disks Required 3
Capacity N-1
Redundancy Yes
RAID5
Minimum Disks Required 3
Capacity N-1
Redundancy Yes
- SCSI to SATA RAID Subsystem 1
- Table of Contents 3
- 1.1 Logical Drive 9
- 1.2 Logical Volume 9
- 1.3 RAID Levels 10
- 1.3.2 JBOD 11
- 1.3.1 NRAID 11
- 1.3.3 RAID0 12
- 1.3.4 RAID1 12
- 1.3.5 RAID (0+1) 13
- 1.3.6 RAID3 14
- 1.3.7 RAID5 14
- 1.4 Spare Drives 15
- 1.5 Rebuild 17
- 1.5.2 Manual Rebuild 18
- Fig. 1.15 Logical Volume 19
- 1.6.3 Limitations 21
- 2 RAID Planning 23
- 2.1.7 Optimization mode 24
- 2.1.8 What RAID level? 24
- 2.1.9 Any spare drives? 24
- 2.2 Configuring the Array 25
- 2.3 Operation Theory 26
- 2.4 Tunable Parameters 29
- Security 33
- 3.2 Communication Parameters 35
- 3.2.2 Terminal Emulation: 36
- 3.2.3 Baud Rate 36
- 3.2.5 View Statistics 37
- 3.2.6 Set IP Address 37
- 3.3 Out-of-Band via Ethernet 38
- 3.3.2 Other Concerns 39
- 3.4 Telnet Connection 40
- 3.5 Secure Link over SSH 41
- 4 LCD Screen Messages 42
- 4.3 Logical Drive Status 43
- 4.4 Logical Volume Status 44
- 4.5 Drive Status 44
- 4.6 Channel Status 45
- 4.8 View and Edit Event Logs 47
- 5 LCD Keypad Operation 48
- 5.2.5 Periodic Cache Flush 50
- 5.3 View Connected Drives: 51
- 5.4 Creating a Logical Drive 52
- 5.4.4 Maximum Drive Capacity 53
- 5.4.5 Spare Drive Assignments 53
- 5.4.6 Disk Reserved Space 53
- 5.4.7 Write Policy 53
- 5.4.8 Initialization Mode 54
- 5.4.9 Stripe Size 54
- NOTICE! 55
- 5.5 Creating a Logical Volume 56
- 5.8.3 Rebuild Settings 62
- 5.9.6 Media Scan 67
- 5.9.7 Write Policy 68
- 5.12.1 Viewing IDs 70
- 5.12.2 Adding a Channel ID 70
- 5.12.3 Deleting a Channel ID 71
- 5.12.4 Data Rate 72
- 5.13 System Functions 74
- Disable Password 75
- 5.13.3 Reset Controller 75
- 5.13.4 Shutdown Controller 75
- 5.13.5 Controller Maintenance 75
- 5.13.6 Saving NVRAM to Disks 76
- 5.13.8 Adjust LCD Contrast 77
- 5.14 Controller Parameters 78
- 5.15 Drive Utilities 80
- 6 Terminal Screen Messages 82
- 6.2 Main Menu 83
- 6.3 Quick Installation 83
- 6.4 Logical Drive Status 84
- 6.5 Logical Volume Status 85
- 6.6 Drive Status 86
- 6.7 Channel’s Status 87
- Fig. 6.10 Event Logs Screen 89
- 7 Terminal Operation 90
- 7.2 Caching Parameters 91
- 7.2.5 Periodic Cache Flush 93
- 7.4 Creating a Logical Drive 95
- 7.5 Creating a Logical Volume 99
- Fig. 7.18 Selection Sub-menu 100
- Fig. 7.19 Confirm Box 100
- Fig. 7.22 Partition List 101
- Fig. 7.23 Confirm Box 101
- Fig. 7.26 Mapping Result Page 103
- Fig. 7.28 Logical Drives List 105
- 7.9.5 Expand Logical Drive 110
- 7.9.6 Add Drive 110
- 7.9.8 Media Scan 111
- 7.9.9 Write Policy 111
- 7.11.2 Disk Reserved Space 114
- 7.11.3 Identifying Drives 115
- Fig. 7.49 Flash All Drives 116
- Fig. 7.54 Existing ID List 118
- 7.12.2 Adding an ID 119
- 7.12.3 Deleting an ID 119
- 7.12.5 View Chip Information 120
- 7.13 System Functions 121
- 7.13.3 Changing the Password 122
- 7.13.4 Setting a New Password 122
- 7.13.5 Disabling the Password 122
- 7.13.6 Reset Controller 123
- 7.13.7 Shutdown Controller 123
- 7.13.8 Adjust LCD Contrast 123
- LCD User Interface 124
- 7.14 Controller Parameters 125
- 7.14.3 Saving NVRAM to Disks 126
- 7.15 View Drive Information 129
- 7.16 Drive Utilities 129
- 8.1 Host-side Parameters 131
- 8.1.4 LUNs per Host ID 133
- 8.1.5 LUN Applicability 134
- 8.1.6 Peripheral Device Type 134
- 8.1.7 In-band (SCSI channel) 134
- Selecting Head Ranges 138
- Selecting Cylinder Ranges 138
- 8.2 Drive-side Parameters: 139
- 8.2.2 Drive I/O Timeout 140
- Queuing (NCQ) Support 141
- 8.2.5 Drive Delayed Write 142
- 9 Enclosure Management 143
- 10 Data Integrity 151
- 10.2 Scheduled Maintenance 154
- 10.2.2 Task Scheduler Options 155
- 10.4 Disk Array Parameters 159
- 11 Array Expansion 161
- Expand Logical Drive: 162
- Re-striping 162
- 11.3 Mode 1 Expansion: 163
- 11.4 Mode 2 Expansion 166
- 11.6 Expand Logical Volume 170
- 12 S.M.A.R.T. Configuration 176
- Technology) 179
- 12.4 Configuration Procedure 181
- 13.2 AV Optimization Mode 185
- 14.1 Basic RAID Management 186
- Max. no. of LD 16 32 188
- Max. no. of LV 816 188
- Max. no. of LUN 128 1024 188
- 14.2 Advanced Features 189
- 14.3 Caching Operation 191
- 14.4 RAID Expansion 192
- 14.5 S.M.A.R.T. Support 192
- 14.6 Redundant Controller 193
- 14.7 Data Safety 194
- 14.8 System Security 195
- 14.9 Environment Management 195
- 14.10 User Interface 196
- 14.11 High Availability 196
- 15.1 Upgrading Firmware 197
- Fig. 15.3 Sending Files 199
- 16 Event Messages 200
- 16.1.3 General Target Events 204
- 16.1.4 Controller Events 205
- 16.2 Event Description 206
- 16.2.3 General Target Events 223
- 16.2.4 Controller Events 228
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