ZFS trouble: unbelievably large files created

[Jeremy Chadwick]

On Fri, Oct 15, 2010 at 01:07:37PM -0400, David Samms wrote:
> I am running into issues with ZFS where perl, specifically amavisd
> running spamassassin creates unbelievably large files, as in files
> 100x the size of the hard disk.
> 
> My setup is a host run a dozen jails.  The host is amd64 FreeBSD
> 8.1-RELEASE-p1 #6 as of Thu Sep 30.  The jails are running 8.0
> release as I have not yet upgraded them.  This setup has been very
> stable till I introduced ZFS.  Below is the zpool setup:
> 
> zpool status
>   pool: m1012
>  state: ONLINE
>  scrub: none requested
> config:
> 
>         NAME        STATE     READ WRITE CKSUM
>         m1012       ONLINE       0     0     0
>           mirror    ONLINE       0     0     0
>             ad10    ONLINE       0     0     0
>             ad12    ONLINE       0     0     0
> 
> Last night I moved six jails from my UFS+S RAID5 file system to the
> new ZFS file system.  Since then perl occasionally runs at 100% disk
> usage accessing files in /var/amavis/.spamassassin  Here is the
> current directory listing:
> 
> ls -l .spamassassin
> total 13352131
> -rw-------  1 vscan  vscan           684032 Oct 15 12:02 auto-whitelist
> -rw-------  1 vscan  vscan               40 Oct 15 12:37 bayes.lock
> -rw-------  1 vscan  vscan          1294336 Oct 15 12:38 bayes_seen
> -rw-------  1 vscan  vscan          4227072 Oct 15 12:38 bayes_toks
> -rw-------  1 vscan  vscan     553184002048 Oct 15 12:38
> bayes_toks.expire3515
> -rw-------  1 vscan  vscan  140743122878464 Oct 15 12:14
> bayes_toks.expire97254
> 
> The last file is 140TB which is pretty good sized for a 1TB disk.
> Disk compression is OFF.  du -hs reports 13G int the .spamassassin
> directory.
> 
> Any thoughts?

Thread titled "Strange ZFS problem, filesystem claims to be full when
clearly not full":

http://lists.freebsd.org/pipermail/freebsd-fs/2010-September/thread.html#9610

-- 
| 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 |