Mike Gerdts <mger...@gmail.com> writes: > John Hoogerdijk wrote: >> Is there a way to zero out unused blocks in a pool? I'm looking for >> ways to shrink the size of an opensolaris virtualbox VM and using the >> compact subcommand will remove zero'd sectors. > > I've long suspected that you should be able to just use mkfile or "dd > if=/dev/zero ..." to create a file that consumes most of the free > space then delete that file. Certainly it is not an ideal solution, > but seems quite likely to be effective.
you'll need to (temporarily) enable compression for this to have an effect, AFAIK. (dedup will obviously work, too, if you dare try it.) -- Kjetil T. Homme Redpill Linpro AS - Changing the game _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
