Date: Sun, 14 Jul 2013 10:49:54 +0200 From: Adam Nowacki <nowakpl@platinum.linux.pl> To: freebsd-fs@freebsd.org Subject: Re: Efficiency of ZFS ZVOLs. Message-ID: <51E26632.8030907@platinum.linux.pl> In-Reply-To: <CACpH0MfRr_SzjXbTSs72NJdcDzOp%2Bwyzgi5ipidjDVy%2BoA2Hng@mail.gmail.com> References: <CACpH0MfRr_SzjXbTSs72NJdcDzOp%2Bwyzgi5ipidjDVy%2BoA2Hng@mail.gmail.com>
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On 2013-07-14 09:55, Zaphod Beeblebrox wrote: > [1:3:303]root@virtual:~> zfs list -rt all vr2/Steam > NAME USED AVAIL REFER MOUNTPOINT > vr2/Steam 3.25T 9.27T 1.18T - > vr2/Steam@20130528-0029 255M - 1.18T - > vr2/Steam@20130529-0221 172M - 1.18T - > > vr2/Steam is a ZVOL exported by iSCSI to my desktop and it contains an NTFS > filesystem which is mounted into C:\Program Files (x86)\Steam. Windows > sees this drive as a 1.99T drive of which 1.02T is used. > > Now... the value of "REFER" seems quite right: 1.18T vs. 1.02T is pretty > good... but the value of "USED" seems _way_ out. 3.25T ... even regarding > that more of the disk might have been "touched" (ie: used from the ZVOL's > impression) than is used, it seems too large. Neither is it 1.18T + 255M + > 172M. This is how much space would be required to store the snapshots plus 2TB volume with no shared blocks between any of the snapshots. 1.18T from snapshots + 2T reservation = 3.18T, just about the 3.25T displayed. You can remove the reservation with 'zfs set refreservation=none vr2/Steam'.
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