Date: Wed, 29 Sep 2010 20:46:38 +0200 From: Torbjorn Kristoffersen <torbjoern@gmail.com> To: freebsd-fs@freebsd.org Subject: Strange ZFS problem, filesystem claims to be full when clearly not full Message-ID: <AANLkTimRmBi=th1oia5ZuKcEtLR%2BYjK04KNYeZhu931A@mail.gmail.com>
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I have a ZFS "tank" called tpool, the server runs a couple of jails (each
with a zfs filesystem). There is a problem with one of these filesystems.
First, its disk usage as shown in ``df -h'':
...
tpool/rb.org 100G 95G 4.6G 95% /jails/rb.org
...
The command ``zfs list'' shows the same:
..
tpool/rb.org 95.4G 4.56G 95.4G /jails/rb.org
..
However, there is a very mysterious problem somewhere.
Something inside this jail is eating diskspace, but we can't find any
directories that is actually taking the diskspace. We first suspected either
fetchmail or spamassassin of causing a lot of space to be used, since some
of their directories were huge. (These were later deleted, and which is why
you see that 4.6GB is now available, before that 0GB was available).
However, we can't find *any trace* of an actual directory or file that is
taking all the spac.e
Take this for instance:
outsidejail# du -sh rb.org
43G rb.org
How can this be? df and zfs are showing that the entire drive is nearly
full, yet I can't find any directory that is actually taking all this space.
I've carefully looked through every single directory within the jail trying
to find something that's taking all that space, but to no avail.
----
My system stats:
# uname -a
FreeBSD grim 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19 02:36:49 UTC
2010 root@mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
# zpool get version tpool
NAME PROPERTY VALUE SOURCE
tpool version 14 default
# zpool status
pool: tpool
state: ONLINE
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
tpool ONLINE 0 0 0
mirror ONLINE 0 0 0
ad4s1d ONLINE 0 0 0
ad6s1d ONLINE 0 0 0
errors: No known data errors
[ Note that I've also done a scrub recently ]
----
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