Lesson 1 in .NET framework

Create QR Code ISO/IEC18004 in .NET framework Lesson 1

Lesson 1
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Recovering from System Failure
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13-3
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the last time a user successfully logged on to the system. If you install or update a service or driver and the system crashes or cannot reboot to the logon screen, the Last Known Good Configuration effectively takes you back to the version of the registry that was active before the driver or service was installed. You also learned about the variety of Safe mode options, which enable the system to start with spe cific drivers or services disabled. Safe mode can often allow you to start an otherwise unbootable computer and, using Device Manager, disable, uninstall, or roll back a troublesome driver or service.
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Failure of the disk subsystem: 11 discussed the steps required to configure disk redundancy through mirrored (RAID-1) or RAID-5 volumes, and how to recover from the failure of a single disk within a fault-tolerant volume.
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Each of these recovery and repair processes makes the assumption that a system can be restarted to some extent. When a system cannot be restarted, the System State, Automated System Recovery, and the Recovery Console can return the system to opera tional status.
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System State
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Windows 2000 and Windows Server 2003 introduced the concept of System State to the backup process. System State data contains critical elements of a system s configuration including:
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The system s registry The COM+ Class Registration Database The boot files, which include boot.ini, ntdetect.com, ntldr, bootsect.dos, and ntbootdd.sys System files that are protected by the Windows File Protection service
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In addition, the following are included in the System State when the corresponding ser vices have been installed on the system:
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Certificate Services database on a certificate server
Active Directory and the Sysvol folder on a domain controller
Cluster service information on a cluster server
Internet Information Services (IIS) metabase on a server with IIS installed
13-4
13
Recovering from System Failure
To back up the System State in the Backup Utility, include the System State node as part of the backup selection. The System State and its components are shown in Figure 13-1.
Figure 13-1
The System State
If you prefer to use the command line, use Ntbackup with the following syntax:
Ntbackup backup systemstate /J "backup job name" ...
Followed by the /F switch to indicate backing up to a file, or appropriate /T, /G, /N, /P switches to back up to a tape. The switches for the Ntbackup command are described fully in 7. There are several important notes and considerations related to backing up the Sys tem State:
You cannot back up individual components of the System State. For example, you cannot back up the COM+ Class Registration Database alone. Because of interde pendencies among System State components, you can back up only the collection of System State components as a whole. You cannot use Ntbackup or the Backup Utility to back up the System State from a remote machine. You must run Ntbackup or the Backup Utility on the system that is being backed up. You can, however, direct the backup to a file on a remote server, which can then transfer the file onto another backup media. Or you can purchase a third-party backup utility that can remotely back up the System State. The System State contains most elements of a system s configuration, but may not include every element required to return the system to full operational capacity. It is therefore recommended to back up all boot, system, data, and application vol umes when you back up the system state. The System State is a critical piece of a complete backup, but is only one piece.
Lesson 1
Recovering from System Failure
13-5
Performing a system state backup automatically forces the backup type to Copy, although the interface may not indicate that fact. Take that fact into consideration when planning whether to include other items in your backup selection.
To restore the System State on a computer that is operational, use the Backup Utility and, on the Restore And Manage Media tab, click the System State check box. If the computer is not operational, you will most likely turn to Automated System Recovery to regain operational status.
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