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You can back up and restore your system archive tools like tar, restoring the archives later. For backups, tar is usually used with a tape device. To automatically schedule backups, you can schedule appropriate tar commands with the cron utility.
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As an alternative to cron, you can use anacron, which activates only when scheduled tasks need to be executed. anacron jobs are entered in the /etc/anacrontab file. For each scheduled task, you specify the number of intervening days when it is executed (7 is weekly, 30 is monthly), the time of day it is run (numbered in minutes), a description of the task, and the command to be executed. For backups, the command would be tar operation. You can use redhat-config-services to turn on the anacron service or have it start up automatically at boot time.
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To back up hosts connected to a network, you can use the Advanced Maryland Automatic Network Disk Archiver (Amanda) to archive hosts. Amanda uses tar tools to back up all hosts to a single host operating as a backup server. Backup data is sent by each host to the host operating as the Amanda server, where they are written out to a backup media such as tape. With an Amanda server, the backup operations for all hosts becomes centralized in one server, instead of each host having to perform their own backup. Any host that needs to restore data simply requests it from the Amanda server, specifying the file system, date, and file names. Amanda has its own commands corresponding to the common backup tasks, beginning with am, such as amdump, amrestore, and amrecover. Configuration files are placed in /etc/amanda and log, and database files in /var/adm/amanda.
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TIP The Unix-based dump and restore utilities are also available on your Linux system. However, they are now deprecated and are no longer reliable on 2.4- kernelbased systems like Red Hat Linux 8.0. TIP You can use the mt command to control your tape device. mt has options to rewind, erase, and position the tape. The rmt command controls a remote tape device.
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6
RAID and LVM
With the onset of cheap, efficient, and very large hard drives, even the most professional systems employ several hard drives. The use of multiple hard drives opens up opportunities for ensuring storage reliability as well as more easily organizing access to your hard disks. Linux provides two methods for better managing your hard disks: Redundant Arrays of Independent Disks (RAID) and Logical Volume Management (LVM). RAID is a way of storing the same data in different places on multiple hard disks. These multiple hard drives are treated as a single hard drive. They include recovery information that allows you to restore your files should one of the drives fail. LVM is a method for organizing all your hard disks into logical volumes, letting you pool the storage capabilities of several hard disks into a single logical volume. Your system then sees one large storage device, and you do not have to micromanage each underlying hard disk and their partitions.
6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6 6
Enabling RAID and LVM in the Kernel
Red Hat provides methods for creating, installing, and configuring RAID and LVM devices during the Linux installation process. If, instead, you wish to add these devices later, you need to first enable support for RAID in the kernel. RAID is not enabled by default unless you installed RAID devices during installation. As discussed in s 7 and 8, you need to configure kernel modules, in this case, modules for RAID and LVM devices. During kernel configuration, select multidevice support (RAID and LVM) from the Linux Kernel Configuration window. You can then choose to enable support for RAID and LVM, either as modules or as a built-in kernel feature (If you
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