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Re: [libvirt] [ANNOUNCE] virt-df 2.1.0 - a 'df' tool for virtual guests



On Tue, May 13, 2008 at 05:42:38PM +0100, Richard W.M. Jones wrote:
> I'm pleased to announce the most recent release of virt-df (2.1.0).
> 
> Virt-df is 'df' for virtual guests. Run the program on the host / dom0
> to display disk space used and available on all partitions on all
> guests.  You don't need to run any sort of program/agent within the
> guest.
> 
>   Home page:       http://et.redhat.com/~rjones/virt-df/
>   Source/binaries: http://et.redhat.com/~rjones/virt-df/files/
>   Developer repository:
>       http://hg.et.redhat.com/virt/applications/virt-df--devel
> 
> This version supports most common filesystems and partitioning
> schemes, including:
>  - Linux ext2/3
>  - DOS FAT32
>  - Windows NTFS
>  - Linux LVM2 (volume groups and logical volumes)
>  - Primary and extended disk partitions
>  - Linux swap
>  - Linux suspend partition

I'm assuming this only works for raw file & block devices ? Are you planning
to support the funky QCow / VMDK formats too ?   The other thing that could 
be annoying is that Fedora 9 support for encrypting all volumes - might need
to prompt for a decryption key for that.

> Included also is an experimental command line tool called 'diskzip'
> which intelligently compresses disk images by leaving out the bits
> which aren't actually used in the filesystems / partitions / volume
> groups contained within.

That's pretty neat. Which file systems does that work for ?   VMWare have
a funky  guest tool which tries to let you get to a similar point. It works
by basically openning a file inside the guest VM and filling it with zeros
until the entire disk is full. THeir backend can then detect and discard
all the sectors with zeros. Understanding the filesystem metdata is a much
nicer way todo this :-)

Regards,
Daniel
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