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 LINUX
fdformat
FDFORMAT(8) Linux Programmer's Manual FDFORMAT(8)
NAME
fdformat - Low-level formats a floppy disk
SYNOPSIS
fdformat [-n] device
DESCRIPTION
fdformat does a low level format on a floppy disk. device is usually one of the following (for floppy devices, the major = 2, and the
minor is shown for informational purposes only):
/dev/fd0d360 (minor = 4)
/dev/fd0h1200 (minor = 8)
/dev/fd0D360 (minor = 12)
/dev/fd0H360 (minor = 12)
/dev/fd0D720 (minor = 16)
/dev/fd0H720 (minor = 16)
/dev/fd0h360 (minor = 20)
/dev/fd0h720 (minor = 24)
/dev/fd0H1440 (minor = 28)
/dev/fd1d360 (minor = 5)
/dev/fd1h1200 (minor = 9)
/dev/fd1D360 (minor = 13)
/dev/fd1H360 (minor = 13)
/dev/fd1D720 (minor = 17)
/dev/fd1H720 (minor = 17)
/dev/fd1h360 (minor = 21)
/dev/fd1h720 (minor = 25)
/dev/fd1H1440 (minor = 29)
The generic floppy devices, /dev/fd0 and /dev/fd1, will fail to work with fdformat when a non-standard format is being used, or if the for-
mat has not been autodetected earlier. In this case, use setfdprm(8) to load the disk parameters.
OPTIONS
-n No verify. This option will disable the verification that is performed after the format.
SEE ALSO
fd(4), setfdprm(8), mkfs(8), emkfs(8)
AUTHOR
Werner Almesberger (almesber@nessie.cs.id.ethz.ch)
AVAILABILITY
The fdformat command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
Linux 0.99 1 February 1993 FDFORMAT(8)