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My problem is still unresolved. On my vm runing a Ubuntu Server. I found a way to zero the free disk space on the vm: dd if=/dev/zero of=zero.small.file bs=1024 count=102400 dd if=/dev/zero of=zero.file bs=1024 sync ; sleep 60 ; sync rm zero.small.file rm zero.fileBut now, the backup have the...

Yes, it's a KVM machine. And it is not an Imagefile, but an LVM Logical Volume. How can I zero (and shrink) the virtual disk?

I use the backup function on the web-interface. But in some of the vm's the vzdump is very oversized: When I look with the df command on the vm I get the information that 1.8 GB of the 20 GB vhd are used. But the backup will need 11.15 GB on hd (said the backup status-mail). On an similarly vm...