Nice tip ! It works fine ! Thanks a lot. Ragards, Thomas Denie Andriessen wrote: > A compressed dd can still be quite large, as there still might contain > non zero values.. > > if you compress the image, a possible way to make the resulting files > smaller is to: > > - do a: 'dd if=/dev/zero of=/dummyfile' on the filesystem first (you > might want to use 'bs' and 'count' parameters) > - if you topped off the disk, delete the all zero dummyfile. > > The zipped result might be smaller. (both with dd and with tar..) > > Regards, > Denie > > ----- Original Message ----- From: <dave@frop.net> > To: "LVM general discussion and development" <linux-lvm@redhat.com> > Sent: Wednesday, April 16, 2008 11:04 PM > Subject: Re: LVM snapshot - "dd" file size > > >> this has nothing to do with LVM. >> >> dd knows nothing about files, it just copies the entire device (or >> file or whatever). >> >> tar will work, if you use the right command line switches. Search >> around on the web for pointers on how to use it. >> >> Another intermediate way would be to compress the image you get with dd. >> >> On Wed, Apr 16, 2008 at 04:59:05PM +0200, Thomas Bellembois wrote: >>> Hi! >>> >>> I am using LVM partitions on a Debian Xen system. >>> I use LVM snapshots to clone and backup my virtual machines. >>> >>> I have noticed that the ISO file created with the "dd" command it much >>> bigger that the partition used space (actually 4.7GB for the ISO - >>> 500MB >>> used space). No problem if I mount the LVM snapshot and "tar" all of >>> the >>> data. >>> >>> I have googled the question and read that "dd" also copy "not used >>> space". >>> Why is the ISO file so big ? Is the "tar" method less safe ? >>> Is there a better solution ? >>> >>> Thanks for your answers. >>> >>> Regards, >>> >>> Thomas >>> >>> >>> >>> _______________________________________________ >>> linux-lvm mailing list >>> linux-lvm@redhat.com >>> https://www.redhat.com/mailman/listinfo/linux-lvm >>> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ >> >> _______________________________________________ >> linux-lvm mailing list >> linux-lvm@redhat.com >> https://www.redhat.com/mailman/listinfo/linux-lvm >> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ >> > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
