On Fri, Jan 21, 2011 at 10:20:34AM -0700, Rodney Beede wrote:

Any tools to go about zeroing about the free space on a btrfs file
system so I can shrink the VMware vmdk virtual disk?

I ran the VMware command, but the dynamic disk is still really big.  I
presume it is due to free space that isn't zeroed out.

   One solution I've used before is to write a single very large file
full of zeroes, filling the filesystem, then delete it.

$ dd if=/dev/zero of=/mountpoint/foo.dat && rm /mountpoint/foo.dat

   Hugo.

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