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Full Discussion: Copy entire disk in FC3
Operating Systems Linux Copy entire disk in FC3 Post 81976 by nexxist on Thursday 25th of August 2005 07:45:40 PM
Old 08-25-2005
Quote:
Originally Posted by dangral
I'm running FC3 and I'd like to copy the entire /dev/hda to /dev/hdc, including all the boot info, so that I can boot off of it in case of failure. This will be a one time thing. I'm doing an app upgrade and I'm very afraid the install will go wrong, so I want to be able to quickly be back up in case of failure.
Any ideas?

Both are 10GB drives, but from different manufacturers. I doubt that makes a difference, but I wanted to include that info.
Quote:
Originally Posted by Sergiu-IT
Hi !
I don't think is necesarely to copy the entire disk/partition... a backup will be enough, but if you insist try to do it with dd (man dd). In Linux it should be something like this:

dd if=/dev/hda of=/dev/hdc

I've never done this before, but it should work.
I agree with Sergiu-IT, you don't have to clone the entire disk. You can just copy important system files in / /usr or /home by using the tar command. I think you can use "tar cvzf /dev/hdc /usr /boot / /home"; and if your original system fails after an application update, you can just restore these directories back to your /dev/hda.

dd if=/dev/hda of=/dev/hdc should work, but you will have to edit the fstab file in /etc/fstab in order to boot from /dev/hdc properly, Since dd will "clone" the disk content in /dev/hda with fstab using /dev/hda's configuration. Unless of course, you physically reconfigure the drives by changing the cables to make "/dev/hdc" become "/dev/hda". I had this similar problem once with my Red Hat Linux 9.

Important: Make sure your target disk (/dev/hdc) is at least with capacity equal or greater than your /dev/hda, or it'll generate an error on /dev/hdc.
 

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LEARN ABOUT MOJAVE

installgrub

installgrub(1M)                                                                                                                    installgrub(1M)

NAME

       installgrub - install GRUB in a disk partition or a floppy

SYNOPSIS

       /sbin/installgrub [-fm] stage1 stage2 raw-device

       The installgrub command is an -only program. GRUB stands for GRand Unified Bootloader.

       installgrub  installs  GRUB  stage  1  and  stage  2  files on the boot area of a disk partition. If you specify the -m option, installgrub
       installs the stage 1 file on the master boot sector of the disk.

       The installgrub command accepts the following options:

       -f

           Suppresses interaction when overwriting the master boot sector.

       -m

           Installs GRUB stage1 on the master boot sector interactively.

       The installgrub command accepts the following operands:

       stage1

           The name of the GRUB stage 1 file.

       stage2

           The name of the GRUB stage 2 file.

       raw-device

           The name of the device onto which GRUB code is to be installed. It must be a character device that is readable and writable.  For  disk
           devices,  specify  the  slice  where  the  GRUB  menu  file  is  located.  (For Solaris it is the root slice.) For a floppy disk, it is
           /dev/rdiskette.

       Example 1: Installing GRUB on a Hard Disk Slice

       The following command installs GRUB on a system where the root slice is c0d0s0:

       example# /sbin/installgrub /boot/grub/stage1 
                /boot/grub/stage2 /dev/rdsk/c0d0s0

       Example 2: Installing GRUB on a Floppy

       The following command installs GRUB on a formatted floppy:

       example# mount -F pcfs /dev/diskette /mnt
       # mkdir -p /mnt/boot/grub
       # cp /boot/grub/* /mnt/boot/grub
       # umount /mnt
       # cd /boot/grub
       # /sbin/installgrub stage1 stage2 /dev/rdiskette

       /boot/grub

           Directory where GRUB files reside.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWcsu                      |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Evolving                     |
       +-----------------------------+-----------------------------+

       boot(1M), fdisk(1M), fmthard(1M), kernel(1M), attributes(5)

       Installing GRUB on the master boot sector (-m option) overrides any boot manager currently installed on the machine. The system will always
       boot the GRUB in the Solaris partition regardless of which fdisk partition is active.

                                                                    24 May 2005                                                    installgrub(1M)
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