Date: Wed, 15 Apr 2015 14:45:07 -0400 From: Alex Merritt <merritt.alex@gmail.com> To: questions@freebsd.org Subject: Disk space allocation Message-ID: <CADK3ta%2B_ky-GrUH8c50s1zYKQ4kU8n0C2dubXYh7r1VrGecHxw@mail.gmail.com>
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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
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
Thanks!
Alex
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