Disk space allocation

[lokadamus at gmx.de]

On 04/17/15 16:25, Alex Merritt wrote:
> On Fri, Apr 17, 2015 at 10:07 AM, lokadamus at gmx.de
> <lokadamus at 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
>>> 
>>> 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 _______________________________________________ 
>>> freebsd-questions at freebsd.org mailing list 
>>> http://lists.freebsd.org/mailman/listinfo/freebsd-questions To
>>> unsubscribe, send any mail to "
>> freebsd-questions-unsubscribe at freebsd.org"
>>> 
>> 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%.
>> 
>> 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.
> 
> The file system is UFS. What do you mean use it with 110%? 
> _______________________________________________ 
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> 
Well, you can fill up your system with 110% Data using before you get
an error of full filesystem.
This is reserved space for error handling. But it is an old technic
for old HDDs.

Look at 8.22:
https://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/disks.html#disk-more-than-full
This value can be changed on installation. If it can be changed on a
running system, i don't know. I didn't test it.

Greeting