Date: Tue, 20 Aug 2013 08:25:42 +0300 From: Kimmo Paasiala <kpaasial@gmail.com> To: aurfalien <aurfalien@gmail.com> Cc: freebsd-fs <freebsd-fs@freebsd.org> Subject: Re: du which understands ZFS Message-ID: <CA%2B7WWSf1OjoYQp0SJ8PcJ=Qynd-W8JNuKSSR5suReE%2Bcrvx_UQ@mail.gmail.com> In-Reply-To: <CAF20B8F-1CBE-4620-9F3D-0E4D05714067@gmail.com> References: <F85B151C-2750-4306-A6DC-E600AB7A7438@gmail.com> <CAFqOu6hpp7%2BcdSNOJkoRqc3MR-mVaLJ4HXBfP3Dq7tLgeo--qw@mail.gmail.com> <CAF20B8F-1CBE-4620-9F3D-0E4D05714067@gmail.com>
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On Tue, Aug 20, 2013 at 8:18 AM, aurfalien <aurfalien@gmail.com> wrote: > > On Aug 19, 2013, at 9:46 PM, Artem Belevich wrote: > >> >> >> >> On Mon, Aug 19, 2013 at 8:51 PM, aurfalien <aurfalien@gmail.com> wrote: >> Hi, >> >> Is there a version of du which understands ZFS? >> >> Currently when running du I get this; >> >> I guess you meant 'df'. >> >> Alas, the answer seems to be 'no, there's no ZFS-aware df'. The reason f= or that is that df gets its info via statfs(2) call and the only info it ge= ts back is total number of blocks and available number of blocks. It's assu= med that used space equals total-available. It worked well enough for other= filesystems where it was filesystem that was managing disk space. >> >> ZFS obviously violates this assumption as available space is actually pr= operty of the pool, not of the filesystem, so ZFS has to lie about total si= ze in order to present (arguably more important) amount of used and availab= le space in a consistent way. >> >> --Artem > > Thanks for the reply. > > There is a ZFS aware df in Illumos. I wonder if it would be possible to = port this to FreeBSD? > > Unsure how it works, hell I didn't even know how df worked until you expl= ained, still kinda don't :) > > At any rate, perhaps I'll bring bring this up in the FreeBSD dev list to = see what traction I get. > > - aurf > > How are you going to define the maximum size of particular dataset when it's set to "infinity" by default. The only way I know to get df(1) to show proper numbers is to set a quota for the dataset to limit the maximum size to something lower than the space available in the pool. -Kimmo
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