Date: Wed, 15 Apr 2015 16:02:26 -0400 From: Lowell Gilbert <freebsd-questions-local@be-well.ilk.org> To: Alex Merritt <merritt.alex@gmail.com> Cc: questions@freebsd.org Subject: Re: Disk space allocation Message-ID: <44a8y9kvn1.fsf@be-well.ilk.org> In-Reply-To: <CADK3ta%2B_ky-GrUH8c50s1zYKQ4kU8n0C2dubXYh7r1VrGecHxw@mail.gmail.com> (Alex Merritt's message of "Wed, 15 Apr 2015 14:45:07 -0400") References: <CADK3ta%2B_ky-GrUH8c50s1zYKQ4kU8n0C2dubXYh7r1VrGecHxw@mail.gmail.com>
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Alex Merritt <merritt.alex@gmail.com> writes: > 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 > > 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. > > What could I be missing here? > > # fdisk > [...] > The data for partition 1 is: > sysid 165,(DragonFly/FreeBSD/NetBSD/386BSD) > start 63, size 16773057 (8189 Meg), flag 80 (active) > beg: cyl 0/ head 1/ sector 1; > end: cyl 1023/ head 255/ sector 63 > > # dumpfs /dev/ad0s1a | grep minfree > minfree 8% optim time maxcontig 15 maxbpg 2048 > > # df -hT > Filesystem Type Size Used Avail Capacity Mounted on > /dev/serno/--.s1a ufs 620M 140M 431M 24% / > devfs devfs 1.0K 1.0K 0B 100% /dev > /dev/serno/--.s1d ufs 2.2G 396K 2.0G 0% /home > /dev/serno/--.s1e ufs 248M 10K 228M 0% /tmp > /dev/serno/--.s1f ufs 2.6G 1.5G 882M 64% /usr > /dev/serno/--.s1g ufs 248M 213M 15M 93% /var > procfs procfs 4.0K 4.0K 0B 100% /proc Try comparing to "geom part list".
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