oversized vzdump backup

J

jans16

New Member
Dec 7, 2010
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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 is 1.2 GB in use, the vzdump only need 1.4 GB, thats ok, I think.

It takes a lot of time to copy the oversized backup to an external usb-hd (more than 1 hour) in contrast to the "normal" backup-size which need only 10 minutes.

I think this is a problem with freespace on the vhd (on an LVM-group), that was not free in the past. So the virtualized system has marked the space as free but the host don't know it. Knows anyone a possibility to make freespace on vhd realy free, so that this is not backed up? Or is there any other solution?

Thanks a lot.
 
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?
 
Hey Jans16,

did you get any answer for your Problem ?
I have the same Problem. Can anybody help ?

In my KVM runs an windows 2008 Server R2 and i deleted about 100Gig of data but the backup still remains on the old size.

Thanks
Peter
 
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:
Code: 
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.file
But now, the backup have the full size of the Logical Volume, that is used as vm-disk!

@tom: this link is only for using image-files, but not for a LV of LVM.
 
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