Date: Sat, 18 Apr 2015 11:54:04 +0800 From: Erich Dollansky <erichsfreebsdlist@alogt.com> To: Alex Merritt <merritt.alex@gmail.com> Cc: "lokadamus@gmx.de" <lokadamus@gmx.de>, questions@freebsd.org Subject: Re: Disk space allocation Message-ID: <20150418115404.5c5af778@B85M-HD3-0.alogt.com> In-Reply-To: <CADK3taJbqXgwBtQhtzCWJ78xxwCzAPg26_M--kSNDs=hWKmw-w@mail.gmail.com> References: <CADK3ta%2B_ky-GrUH8c50s1zYKQ4kU8n0C2dubXYh7r1VrGecHxw@mail.gmail.com> <553113AD.6000502@gmx.de> <CADK3taJbqXgwBtQhtzCWJ78xxwCzAPg26_M--kSNDs=hWKmw-w@mail.gmail.com>
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Hi, On Fri, 17 Apr 2015 10:25:48 -0400 Alex Merritt <merritt.alex@gmail.com> wrote: > On Fri, Apr 17, 2015 at 10:07 AM, lokadamus@gmx.de <lokadamus@gmx.de> > wrote: > > > On 04/15/15 20:45, Alex Merritt wrote: > > > Hello, > > > > > > File systems such as ext3/4 reserve some amount of space for > > > allocation only by privileged users, which can be adjusted, e.g. > > > > > > tune2fs -m reserved-blocks-percentage /dev/sdaN > > > same as FreeBSD. > > > I installed a BSD system using Virtualbox, giving it an 8GB disk, > > > but > > 'df' > > > shows an aggregate size among all mount points to be less than the > > > capacity. The minfree parameter to tunefs defaults to 8% (see > > > below) but > > 8% > > > does not account for the difference in 8189MB capacity vs sum of > > > ca. 6G among all file systems (shown by df). There's ca. 27% of > > > capacity unavailable. > > > There is space required to manage the disk too. > > Which filesystem and FreeBSD Version you are using? > > UFS/ UFS2 have an option, that in default setting 10% are reserved. > > So you can use your partition with 110%. But only root can write into this extra space. > > > > Greetings > > > > I am using DragonFly BSD, and "geom" does not seem to be in the > package repository. I mailed here assuming it is not a distro-specific > characteristic. > geom is part of FreeBSD. It do not know if PC-BSD compiles it into the kernel. > The file system is UFS. What do you mean use it with 110%? Root can use above 100% of the nominal capacity of drive. I am not so sure if it really is 110% but it is a figure above 100% and this figure can be tuned when the file system is not mounted. Erich
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