On Mon, Sep 05, 2011 at 11:50:43AM +0200, Leen Besselink wrote: > Hi, > > Just noticed something about df -h output I didn't expect. > > I'm sorry if this has already been answered or is a know problem. > > Just see the test-part below to see what I did. > > ____ setup ____ > > - installed Fedora 16 Alpha on a KVM-VM with one 8GB HD-image. > - did a yum update > ( - got a kernel update, which broke grub setup, worked around it: > kernel I use is: 3.0.0-1.fc16.x86_64) > - installed btrfs-progs > - created a directory /test > - created 2 files with dd from /dev/zero with the size of 2GB in /test > - created 2 loopback devices of the files > - created a btrfs filesystem with RAID 1 data and RAID1 meta-data > - created directory /test/mnt > > ____ test _____ > > - mounted the btrfs filesystem on /test/mnt > - created a file of 256MB with dd from /dev/zero in /test/mnt > - created a snapshot of /test/mnt in /test/mnt/snap1 > - deleted 256MB file in /test/mnt > - deleted snapshot /test/mnt/snap1 > - checked df -h, 256MB wasn't released. The filesystem does not look empty > - unmounted /test/mnt > - mounted /test/mnt > - checked df -h, 256MB was released. The filesystem does look empty > > Hope this is helpful.
Snapshot/subvolume deletion is asynchronous -- it can take a while to happen. Try waiting a minute or two after the snapshot deletion and before looking at df -h. Hugo. -- === Hugo Mills: hugo@... carfax.org.uk | darksatanic.net | lug.org.uk === PGP key: 515C238D from wwwkeys.eu.pgp.net or http://www.carfax.org.uk --- If it's December 1941 in Casablanca, what time is it --- in New York?
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