Hi, A good rough estimate would be the total of the space that is displayed under the "USED" column of "zfs list" for those snapshots.
Here is an example : -- snip -- [EMAIL PROTECTED] zfs list -r tank NAME USED AVAIL REFER MOUNTPOINT tank 24.6M 38.9M 19K /tank tank/fs1 24.4M 38.9M 18K /tank/fs1 tank/[EMAIL PROTECTED] 24.4M - 24.4M - -- snip -- In the above case tank/[EMAIL PROTECTED] is using 24.4M. So, if we delete that snapshot it would freeup about 24.4M. Let's delete it an see what we get : -- snip -- [EMAIL PROTECTED] zfs destroy tank/[EMAIL PROTECTED] [EMAIL PROTECTED] zfs list -r tank NAME USED AVAIL REFER MOUNTPOINT tank 220K 63.3M 19K /tank tank/fs1 18K 63.3M 18K /tank/fs1 -- snip -- So, we did get back 24.4M freed (39.9M + 24.4M = 63.3M). Note that this could get a little complicated if there are multiple snapshots which refer to the same set of blocks. So, even after deleting one snapshot you might not see the space freed up. And this could be because, of the second snapshot which is refering to some of the blocks still. Hope that helps. Thanks and regards, Sanjeev On Wed, Dec 03, 2008 at 12:26:48AM +0000, Robert Milkowski wrote: > Hello none, > > Thursday, November 6, 2008, 7:55:42 PM, you wrote: > > n> Hi Milek, > n> Thanks for your reply. > n> What I really need is a way to tell how much space will be freed > n> for any particular set of snapshots that I delete. > > n> So I would like to query zfs, > n> "if I delete these snapshots > n> storage/[EMAIL PROTECTED] > n> storage/[EMAIL PROTECTED] > n> how much space will be freed?" > > I'm afraid you can do only one at a time. > > -- > Best regards, > Robert mailto:[EMAIL PROTECTED] > http://milek.blogspot.com > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
