ZFS volume does not seem to free space for deleted files

[krad]

also if compression was enabled and it was mainly mails you deleted dont
expect ot get the space savings you think you might get as the compression
ratios would be good. Lets not even start on dedup...

On 14 July 2015 at 11:00, Matthew D. Fuller <fullermd at over-yonder.net>
wrote:

> On Tue, Jul 14, 2015 at 11:49:17AM +0200 I heard the voice of
> accounts-ag, and lo! it spake thus:
> >
> > So according to my calculation it is using less than 20GB of space
> > for snapshots. Which does not make much sense to me as I clearly do
> > expect the deleted files to show up somewhere (I did it on
> > 2015-07-13). So how can the big difference to USED be explained
> > which reports 116G in total?
>
> I'm pretty sure you can't just add up those USED's and get a number
> suggesting how much space deleting them all will free up.  AIUI, the
> USED number for a snapshot means how much that one alone is using;
> e.g., how much space would be freed by deleting just that one.  So any
> blocks referenced by 2 or more wouldn't show up in those numbers.  A
> bunch of files that have been sitting around a long time would be a
> good candidate for existing in most (/all) of them, so you won't see
> them in per-snapshot USED until you delete all but 1.
>
>
> --
> Matthew Fuller     (MF4839)   |  fullermd at over-yonder.net
> Systems/Network Administrator |  http://www.over-yonder.net/~fullermd/
>            On the Internet, nobody can hear you scream.
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