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Date:      Mon, 28 Feb 2011 16:26:59 +0300
From:      c0re <nr1c0re@gmail.com>
To:        Robert Bonomi <bonomi@mail.r-bonomi.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: / file system is full, but du does not show that it's full
Message-ID:  <AANLkTimQU6sTJT%2BT_FqOWvBDT06FnUziG8DLq316ErL=@mail.gmail.com>
In-Reply-To: <201102281218.p1SCIR87034416@mail.r-bonomi.com>
References:  <AANLkTikyiZD%2BO6BKCighmuyppo5j2NinzoJE04zW8sXB@mail.gmail.com> <201102281218.p1SCIR87034416@mail.r-bonomi.com>

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2011/2/28 Robert Bonomi <bonomi@mail.r-bonomi.com>:
>> From owner-freebsd-questions@freebsd.org =A0Mon Feb 28 05:31:46 2011
>> Date: Mon, 28 Feb 2011 14:24:30 +0300
>> From: c0re <nr1c0re@gmail.com>
>> To: Matthew Seaman <m.seaman@infracaninophile.co.uk>
>> Cc: FreeBSD <freebsd-questions@freebsd.org>
>> Subject: Re: / file system is full, but du does not show that it's full
>>
>> 2011/1/6 Matthew Seaman <m.seaman@infracaninophile.co.uk>:
>> > On 06/01/2011 11:26, c0re wrote:
>> >> # df -h
>> >> Filesystem =A0 =A0 Size =A0 =A0Used =A0 Avail Capacity =A0Mounted on
>> >> /dev/ad0s1a =A0 =A0496M =A0 =A0466M =A0 -9.8M =A0 102% =A0 =A0/
>> >>
>> >> So it's full.
>> >>
>> >> But by du it's not appeared to be full
>> >>
>> >>
>> >> # du -hxd 1 /
>> >> 2.0K =A0 =A0/.snap
>> >> 512B =A0 =A0/dev
>> >> 2.0K =A0 =A0/tmp
>> >> 2.0K =A0 =A0/usr
>> >> 2.0K =A0 =A0/var
>> >> 1.9M =A0 =A0/etc
>> >> 2.0K =A0 =A0/cdrom
>> >> 2.0K =A0 =A0/dist
>> >> 1.0M =A0 =A0/bin
>> >> 131M =A0 =A0/boot
>> >> =A010M =A0 =A0/lib
>> >> 356K =A0 =A0/libexec
>> >> 2.0K =A0 =A0/media
>> >> =A012K =A0 =A0/mnt
>> >> 2.0K =A0 =A0/proc
>> >> 7.2M =A0 =A0/rescue
>> >> 296K =A0 =A0/root
>> >> 4.7M =A0 =A0/sbin
>> >> 4.0K =A0 =A0/lost+found
>> >> 157M =A0 =A0/
>> >>
>> >
>> > Do you have partitions mounted at /tmp, /usr, /var etc? =A0Does the
>> > output of your du command change if you unmount those partitions? (It
>> > might be an idea to boot into a livefs CD or DVD given that du(1) live=
s
>> > in /usr/bin, so a bit tricky to unmount /usr and then run du)
>> >
>> > My guess is that you've at one time created files beneath what is
>> > usually a mount point. =A0Mounting the partition over them makes those
>> > files inaccessible, but they still take up space on the drive.
>> >
>> > =A0 =A0 =A0 =A0Cheers,
>> >
>> > =A0 =A0 =A0 =A0Matthew
>> >
>> > --
>> > Dr Matthew J Seaman MA, D.Phil. =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 7 =
Priory Courtyard
>> > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =
=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0Flat 3
>> > PGP: http://www.infracaninophile.co.uk/pgpkey =A0 =A0 Ramsgate JID:
>> > matthew@infracaninophile.co.uk =A0 =A0 =A0 =A0 =A0 =A0 =A0 Kent, CT11 =
9PW
>> >
>> >
>>
>> At last I found time to check it. Booted with frenzy life cd, mounted
>> only / partition and saw trash
>> /var/spool. Deleted it and it solved problem.
>> But later was and idea to mount device of / (/dev/da0s1a) as /mnt/root
>> and just delete those files without need of livecd. It works in Linux.
>> But in freebsd i got
>>
>> # mount /dev/da0s1a /mnt/root/
>> mount: /dev/da0s1a : Operation not permitted
>>
>> So only single user mode or live cd could solve it.
>
> *NOT* true. =A0Stopping any daemons that were using "/var/spooll", and th=
en
> umount(1)-ing it would have done the trick from multi-user mode.
>

Yeah, not true.

Checked with lsof /var and it was used by these daemons:

devd
syslogd
rpcbind
snmpd
mysqld
httpd
sendmail
cron

Yes, I can stop them all,  but was not sure about stopping devd...



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