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Cobalt RaQ XTR User Manual 307
Redundant Array of Independent Disks (RAID)
A redundant array of independent disks is a way of storing the same data in
different places (thus, redundantly) on multiple hard disks. A RAID appears
to the operating system to be a single virtual disk drive.
Redundancy means that there is protection against the failure of any single
hard disk drive. Redundant data is used by a RAID system in the event of a
failure; this redundant data can either be a mirror copy or parity data used to
reconstruct the actual data.
There are a variety of different types and implementations of RAID, each
with its own advantages and disadvantages.
• RAID-0 combines the separate hard disk drives into one virtual disk
drive and offers the best performance of the three options. However, the
data on the disk drives is not redundant and the system is thus not
fault-tolerant. This option is available on server configurations with two
or more hard disk drives.
• RAID-1, also known as disk mirroring, consists of a primary hard disk
drive and a secondary hard disk drive; the secondary disk drive is an
exact copy or “mirror image” of the primary disk drive. This option is
only available on a configuration with two hard disk drives.
• RAID-5 includes a rotating parity-bit array. All read and write
operations can be overlapped. RAID-5 does not store redundant data but
it does store the parity information which can be used to reconstruct data
in the event of a single hard-disk-drive failure. RAID-5 requires at least
three hard disk drives for the array.
Although RAID-1 and RAID-5 (but not RAID-0) can protect your data in
case of a hard-disk-drive failure, they do not protect against operator and
administrator (human) error, or against loss due to programming bugs.
RAID can be implemented in hardware or in software. Hardware RAID is
always a “disk controller”, that is, a device to which one can cable up the
hard disk drives. Software RAID is a set of kernel modules, together with
management utilities that implement RAID purely in software, and require
no extra hardware.
Root name server
On the Internet, the root name server system is the manner in which an
authoritative master list of all top-level domain names (such as .com, .net,
.org and individual country codes) is maintained and made available.
SCSI
See Small Computer System Interface (SCSI).
- COBALT RaQ™ XTR 1
- Part Number: 070-00263-01 2
- Date: 01-2001 2
- Important Safeguards 3
- List of chapters 7
- Cobalt RaQ XTR User Manual ix 9
- Contents 11
- 3 Site User 33 12
- 4 Site Management 55 13
- 5 Server Management 109 15
- 6 Services 189 17
- A Using the LCD Console 195 17
- E Domain Name System 245 19
- H Licenses 287 21
- I Glossary 295 21
- Introduction 23
- Levels of user 24
- Site User 25
- Site Administrator 26
- RaQ XTR Server Desktop 29
- RaQ XTR usage requirements 30
- Setting up the RaQ XTR 31
- Front view of the RaQ XTR 32
- Rear view of the RaQ XTR 33
- Hard disk drive bay view 34
- RaQ XTR setup 35
- Connecting to the network 36
- PRIMARY IP ADDR: 37
- Figure 9. LCD console 38
- Setting the configuration 39
- IP Address: 41
- 192.168.25.77 41
- Active Assist — Online Help 43
- License agreement 45
- System Settings 46
- Figure 12. System Settings 48
- RAID Setup 49
- Figure 13. RAID setup 50
- Registration 51
- Cobalt RaQ XTR User Manual 31 53
- 32 Cobalt RaQ XTR User Manual 54
- Figure 19 57
- Personal Profile screen 57
- Overview of WebMail 58
- Accessing WebMail 58
- Compose 59
- Chapter 3: Site User 60
- 38 Cobalt RaQ XTR User Manual 60
- Figure 22 61
- Add File to Upload screen 61
- Folder List 62
- Messages in a folder 64
- Moving a message 64
- Replying to a message 65
- Forwarding a message 66
- Deleting a message 66
- Manage Folders 67
- Logging out of WebMail 68
- Personal profile 69
- Forward Email To 70
- Vacation message 71
- Usage Data 72
- Performing a backup 73
- 54 Cobalt RaQ XTR User Manual 76
- Site Management 77
- 58 Cobalt RaQ XTR User Manual 80
- User management 82
- Adding a site user 84
- Removing a site user 87
- Email aliases 88
- Adding an email alias 89
- Changing user settings 90
- Catch-all email account 92
- Creating a TSV text file 93
- Importing a list of users 94
- Exporting a list of users 95
- Mailing list management 96
- Adding a mailing list 97
- Modifying a mailing list 99
- Removing a mailing list 99
- Site settings 100
- Changing site settings 101
- Suspend a virtual site 103
- FTP settings 104
- SSL settings 105
- Cobalt RaQ XTR User Manual 87 109
- 88 Cobalt RaQ XTR User Manual 110
- Chapter 4: Site Management 110
- Cobalt RaQ XTR User Manual 91 113
- Delete an SSL certificate 114
- Usage statistics 115
- Cobalt RaQ XTR User Manual 95 117
- Cobalt RaQ XTR User Manual 97 119
- Cobalt RaQ XTR User Manual 99 121
- Backup file locations 126
- Restore 127
- Disaster recovery 129
- Server management 130
- Server Management 131
- RaQ XTR Administrator 132
- Approaches to RaQ XTR 134
- Definition of a virtual site 135
- Organization of the Server 136
- Management tab 136
- Site management 138
- Search and sort functions 139
- Figure 55 141
- Overview of virtual sites 142
- FrontPage Server Extensions 146
- Active Server Pages (ASP) 147
- PHP embedded scripting 148
- Adding a virtual site 151
- Removing a virtual site 153
- Control panel 156
- Services 157
- Web server 158
- Email server 159
- SMTP server 159
- POP-before-SMTP feature 160
- Email relaying 162
- Telnet server 164
- ASP Administrative Server 166
- Network 167
- Bandwidth 168
- Bandwidth Limits table 169
- Applying a bandwidth limit 170
- Modifying a bandwidth limit 171
- Deleting a bandwidth limit 171
- Server Usage 173
- Chapter 5: Server Management 178
- Backup and Restore 182
- Knox Arkeia 184
- Legato NetWorker 185
- Veritas NetBackup 186
- Maintenance 187
- Adding a storage device 188
- Shutdown 191
- System Information 192
- Support tools 193
- Active Monitor 194
- Active Monitor status table 195
- RAID failure 197
- Fan failure 199
- BlueLinQ 200
- New Software 201
- Updates 204
- Installed Software 207
- Settings 208
- Developing Web pages 212
- Chapter 6: Services 216
- Using the LCD Console 217
- SELECT: 218
- SETUP NETWORK 218
- Configure UPS 220
- Rebooting 223
- Set sequence 224
- Lock panel 226
- Unlock panel 227
- Reset password 228
- Desktop 229
- Powering down 230
- Server not responding 231
- Product Specifications 233
- System management 234
- Physical data 235
- Regulatory approvals 236
- Upgrading the RaQ XTR 237
- Figure 104 242
- Re-inserting a drive sled 242
- Drive Bay Track 242
- Installing additional memory 243
- Figure 106 244
- Removing the cover 244
- Figure 107 245
- Installing a DIMM 245
- DIMM Eject Levers 245
- Figure 108 246
- Figure 109 247
- Replacing a fan 250
- Figure 116 252
- Advanced Information 255
- Enabling Interbase 6.0 256
- Serial console port 258
- Development tools 262
- Configuration files 263
- Directory structure 264
- Customized error Web pages 265
- Site user home page 266
- Domain Name System 267
- Adding a secondary domain 272
- Adding a secondary network 272
- Advanced DNS 273
- Delegating a subdomain 274
- Delegating a subnet 275
- Configuring server settings 275
- Sample setup of DNS service 278
- Reverse Address (PTR) record 279
- Forward Address (A) record 280
- Mail Server (MX) record 281
- System (DNS) 282
- What is a DNS record? 283
- How does DNS work? 283
- Disaster Recovery with 285
- Third-Party Software 285
- Locking the UI databases 286
- Technical notes 297
- Performing Disaster Recovery 302
- /var/cobalt/backups/ for 303
- Contacting Cobalt Networks 305
- Solutions 306
- Cobalt Developer Network 306
- Discussion Groups 306
- The Knowledge Base 307
- Online technical papers 307
- Education 307
- Technical Support 308
- Licenses 309
- GNU General Public License 310
- SSL License 316
- Glossary 317
- Appendix I: Glossary 334
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