On 05/05/17 17:33, Robert Moskowitz wrote:
> I have worked out the dd command to copy my work in progress 4Gb image:
>
> dd if=/dev/sdb of=cubietruck.img bs=512 count=6268927
>
> and restore it with:
>
> dd if=/home/rgm/arm/Centos/cubietruck.img of=/dev/sdb bs=4M; sync
>
> But I would like to compress this, making a .xz file that is expanded
> with xzcat.
>
> I have not figured this out, so am asking for a bit of help (I have had
> to increase the root partition so backing up is a larger file now).
>
> thanks
>
well, "dd if=/dev/sdb| xz > file.xz " ?
I prefer using myself pxz for parallel compression.
As the tool we use to create the images just output raw .img file, we
compress those like this :
for file in *.img ; do echo "==== Compressing ${file} ======" ; time pv
${file} |pxz -T 16 > ${file}.xz ; done
Apply some salt/pepper to your needs and enjoy :-)
--
Fabian Arrotin
The CentOS Project | http://www.centos.org
gpg key: 56BEC54E | twitter: @arrfab
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