On Nov 21, 2007 1:26 PM, Jerry Geis <geisj@xxxxxxxxxxxxxxx> wrote:
> I have a 100G disk on an old redhat 7.3 system.
>
> Filesystem Size Used Avail Use% Mounted on
> /dev/hda1 9.6G 2.4G 6.7G 27% /
> /dev/hda3 99G 6.1G 88G 7% /home
> hda2 is 2G swap
>
> I am trying to back that complete image up on my centos 5 system.
> I can do the dd if=/dev/hda bs=1M | ssh root@machine 'cat > disk.img'
> which gets me the whole 100G.
>
> As you can see most of the disk is unused.
> Is there a way to trim the resulting image to only be 10G instead of 100G?
>
> Thanks,
> Jerry
Try gzipping it, or bzip2:
dd if=/dev/hda bs=1M | gzip | ssh root@machine 'cat > disk.img.gz'
Make sure to put the gzip before the ssh, so you'll compress before
you send over the network.
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