[CentOS] backup with dd

Hiep Nguyen hiep at ee.ucr.edu
Fri Jun 27 13:31:42 UTC 2008

On Wed, 25 Jun 2008, Lanny Marcus wrote:

> On Wed, Jun 25, 2008 at 1:46 PM, Les Mikesell <lesmikesell at gmail.com> wrote:
>> Hiep Nguyen wrote:
>>> hi all,
>>> i have a centos box and would like to back up just in case the hard drive
>>> fail.  one way to do this is duplicate the image of the hard drive, so if
>>> the hard drive fail, just remove it and put mirrored hard drive and done.
>>> here my system info:
>>> uname -a
>>> Linux jadenet.jadesterling.com 2.6.9-22.0.2.EL #1 Tue Jan 17 06:51:40 CST
>>> 2006 i686 i686 i386 GNU/Linux
>>> df -h
>>> Filesystem            Size  Used Avail Use% Mounted on
>>> /dev/mapper/VolGroup00-LogVol00
>>>                       37G   15G   20G  43% /
>>> /dev/hda1              99M  8.9M   85M  10% /boot
>>> none                  188M     0  188M   0% /dev/shm
>>> i'm looking into dd, but is there anything better than dd?
>>> by the way, i would like to use external hard drive via usb to do mirror
>>> image.
>> dd has the advantage of creating a disk that is instantly usable.  The
>> disadvantages are that you have to have it unmounted while making the copy
>> (boot from a CD) and it takes a long time to complete since you have to copy
>> even the unused blocks.  There is also the possibility that your working
>> disk will develop a bad spot that you don't realize until you hit it during
>> the copy, leaving you with 2 bad disks (rotating 2 copies would avoid this
>> issue).
>> Clonezilla-live is a boot-from CD linux that will copy just the used
>> portions of the disk and can save to another disk or image files on local
>> disks or over the network.  I'd recommend it over dd, but maybe someone has
>> a way to do LVM snapshots so the copy can be done without a reboot.
> I'm downloading the .iso for clonezilla-live now. It's a very small
> download. 81.2 MB

i don't know if this is possible, but assume my centos box's motherboard 
goes sour, can i just take its hard drive and put on similar pc?

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