Date: Fri, 25 Aug 2000 12:27:12 -0400 (EDT) From: Robert Gash <gashalot@gashalot.com> To: freebsd-questions@freebsd.org Subject: Disk usage reporting error Message-ID: <Pine.LNX.4.21.0008251212550.28762-100000@raq.tabernae.com>
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I recently installed FreeBSD 4.1 on a fileserver here at my place that
has the nice feature of having a 61G Maxtor DiamondMax drive to store
the data on. My problem is this: after creating the slices for the
system (/ /usr /var /tmp) I then created a /data slice for the
remaining disk space (about 52G). This is, of course, all UFS and is
running "dangerously dedicated."
The question I have relates to the disk usage displayed in `df`. The
/data slice is approximately 52G in size. When I run the `df -h`
command, it displays the size properly. However, I only have about 4GB
worth of data on the partition right now (which is displayed properly in
the "Used" column), yet df is reporting only 44G of space is available
for use. For me this is more than enough, but I want to know where my
"extra" 4GB of disk has gone in this instance, because 52 - 4 != 44.
I know that you lose a good deal of space on large partitions to
superblock backups and FS-related information, but should I be losing
4GB of space to this, and more importantly should df be deducting that
from only the available amount instead of both "size" and "available?"
Here's some diagnostic information for those of you who care (I know
the compile date is a little early, I had neglected to ntpdate the
system yet [bios battery dosen't keep time]):
uname -a
-------------------------------------------------------------
FreeBSD jamesbrown.dorm.gashalot.com 4.1-STABLE FreeBSD 4.1-STABLE
#1: Sat Jan 1 06:08:53 EST 2000
gashalot@jamesbrown.dorm.gashalot.com:/usr/src/sys/compile/JAMESBROWN
i386
-------------------------------------------------------------
df
-------------------------------------------------------------
Filesystem 1K-blocks Used Avail Capacity Mounted on
/dev/ad0s1a 254063 33139 200599 14% /
/dev/ad0s1h 54877102 3976129 46510805 8% /data
/dev/ad0s1f 254063 8 233730 0% /tmp
/dev/ad0s1e 2032623 1326921 543093 71% /usr
/dev/ad0s1g 254063 2306 231432 1% /var
procfs 4 4 0 100% /proc
-------------------------------------------------------------
df -h
-------------------------------------------------------------
Filesystem Size Used Avail Capacity Mounted on
/dev/ad0s1a 248M 32M 196M 14% /
/dev/ad0s1h 52G 3.8G 44G 8% /data
/dev/ad0s1f 248M 8.0K 228M 0% /tmp
/dev/ad0s1e 1.9G 1.3G 530M 71% /usr
/dev/ad0s1g 248M 2.3M 226M 1% /var
procfs 4.0K 4.0K 0B 100% /proc
-------------------------------------------------------------
dmesg |grep ad0
-------------------------------------------------------------
ad0: 58623MB <Maxtor 96147U8> [119108/16/63] at ata0-master using UDMA33
-------------------------------------------------------------
Thanks for any help anybody can provide.
-R
--
Robert Gash - CS Major \ gashalot@gashalot.com - gte393u@prism
Georgia Tech - Atlanta GA \ www.gashalot.com - www.techwreck.net
"I can't complain, but sometimes I still do." -Joe Walsh
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