[CentOS] backup with dd

Lanny Marcus lmmailinglists at gmail.com
Wed Jun 25 20:38:24 UTC 2008

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
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