Rebuilding the Linux Operating System

Rebuild the operating system in the event of a disaster.

Before You Begin

Ensure that the destination client is same as source client while performing a disaster recovery.
Make sure to Install the Linux Operating System on the system that you want to restore. Make sure to install the Operating System exactly as it existed prior to a hardware or software corruption problem.
The client computer must have a default install partition with the Linux File System iDataAgent installed on it. Make sure to enable the Networking option. The TCP/IP, hostname, and domain name settings of the default install must match those of the system that you are restoring.
Create and mount a root file system on the system that you want to restore.

Type the command to create partitions/slices on the disk.
```
fdisk [-l] [-b SSZ] [-u] device
```
Type the command to create the root file system.
```
 
mkfs [-V] [-t fstype] [fs-options] /dev/<hda1> [size]
```
where <hda1> is the Drive Identifier of the partition where you want to create the root file system.

For example:
```
 
mkfs [-V] [-t linux] [devfs] /dev/<hda1> [100]
```
Type the command to mount the new root file system at /mnt.
```
 
mount /dev/<hda1> /mnt
```
Where <hda1> is the Drive Identifier of the partition containing the root file system.

For example:
```
 
mount /dev/<hda1> /mnt
```
If any other file systems existed on the root disk before the crash, type the command to recreate them as well.
```
 
mkfs [-V] [-t fstype] [fs-options] /dev/<hda2> [size]
```
Create an empty directory called "proc" on /mnt.
```
mkdir /mnt/proc
```
If you have recreated any file systems other than root, type the command to mount these as well.
```
 
mkdir /mnt/<file_system_name>
```
```
 
mount /dev/<hda2>  /mnt/<file_system_name>
```
where <file_system_name> is the name of the file system and <hda2> is the Drive Identifier of the partition containing the file system.
Skip this step for computers that boot by using the UEFI or EFI boot loader.

If required, install either the lilo or grub bootloader (per the bootloader that was used in your environment) to the restored disk.

For example:
```
chroot /mnt
```
```
 
grub-install /dev/<hda>
```
Exit and restart the computer.