On Thu, May 15, 2008 at 02:54:53PM +0100, Daniel P. Berrange wrote: > > 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 ? Yes, interesting point. Since I always use flat files or straight partitions for my guests I admit I hadn't given this much thought :-) However support for these formats is just a matter of decoding enough of the structure to enable the same mappings to be made in the 'virt-df' library, same as for LVM2 or indeed MBR partitions now. I'll take a look at it. IIRC there are several different undocumented variations on the QCow format? > 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. Yes -- any encrypted volumes aren't going to work at the moment, and couldn't work unless there was a way to access the passphrase. > > 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 :-) It works with most of the formats supported by virt-df. For MBR & LVM once you've parsed the partition tables / LVM metadata, then the information you need just falls out naturally. For NTFS & DOS FAT (you won't believe it but ...) you need to find the allocation bitmaps/tables in both cases in order to calculate blocks used/free for df anyway. For ext2 it's a little bit more tricky because one needs to additionally parse the group block free bitmaps [this bit doesn't work at the moment, but is in principle very simple to add]. Rich. -- Richard Jones, Emerging Technologies, Red Hat http://et.redhat.com/~rjones virt-top is 'top' for virtual machines. Tiny program with many powerful monitoring features, net stats, disk stats, logging, etc. http://et.redhat.com/~rjones/virt-top -- Fedora-xen mailing list Fedora-xen@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-xen
