Large discrepancy in reported disk usage on USR partition
Jeremy Chadwick
koitsu at FreeBSD.org
Thu Oct 30 18:32:15 PDT 2008
On Fri, Oct 31, 2008 at 11:50:39AM +1030, Brendan Hart wrote:
> >> #: df -h
> >> Filesystem Size Used Avail Capacity Mounted on
> >> /dev/aacd0s1a 496M 163M 293M 36% /
> >> devfs 1.0K 1.0K 0B 100% /dev
> >> /dev/aacd0s1e 496M 15M 441M 3% /tmp
> >> /dev/aacd0s1f 28G 25G 1.2G 96% /usr
> >> /dev/aacd0s1d 1.9G 429M 1.3G 24% /var
>
> > Is this output untruncated? Is df really df or an alias to 'df -t nonfs'?
>
> Yes, it really is the untruncated output of "df -h". I also tried the "df -t
> nonfs" and it gives exactly the same output as "df". What are you expecting
> that is not present in the output ?
>
> > Is it possible that nfs directory got written to /usr at some point in
> time?
> > You would only notice this with du if the nfs directory is unmounted.
> > Unmount it and ls -al /usr/mountpoint should only give you an empty dir
>
> Bingo!! That is exactly the problem. An NFS mount was hiding a 17G local dir
> which had an old copy of the entire NFS mounted dir. I guess it must have
> been written incorrectly to this standby server by RSYNC before the NFS
> mount was put in place. I will add an exclusion to rsync to make sure it
> does not happen again even if the NFS dir is not mounted.
>
> Thank you for your help, you have saved me much time rebuilding this server.
Can either of you outline what exactly happened here? I'm trying to
figure out how an "NFS mount was hiding a 17G local dir", when there's
no NFS mounts shown in the above df output. This is purely an ignorant
question on my part, but I'm not able to piece together what happened.
--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |
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