Disk space allocation
lokadamus at gmx.de
lokadamus at gmx.de
Fri Apr 17 14:33:49 UTC 2015
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:
>>> File systems such as ext3/4 reserve some amount of space for
>>> allocation only by privileged users, which can be adjusted,
>>> tune2fs -m reserved-blocks-percentage /dev/sdaN
>>> I installed a BSD system using Virtualbox, giving it an 8GB
>>> disk, but
>>> 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
>>> 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
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>> 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%.
> 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%?
> freebsd-questions at freebsd.org mailing list
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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:
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.
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