My system
#uname -a
FreeBSD bxzxfreebsd.slof.com 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #4:
Mon Oct 6 15:02:42 CST 2008
root@bxzxfreebsd.slof.com:/usr/obj/usr/src/sys/lhmwzy amd64

zfs version:
ZFS filesystem version 6
ZFS storage pool version 6
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On Tue, Oct 07, 2008 at 05:32:43PM +0800, lhmwzy wrote:
> I create a zfs volume pool/lhm and give it quota 1M use "zfs set
> quota=1m pool/lhm"
>
> #zfs get all pool/lhm
> zfs get all pool/lhm
> [ttyp0][5:22:12pm]
> NAME PROPERTY VALUE SOURCE
> pool/lhm type filesystem -
> pool/lhm creation Tue Oct 7 17:14 2008 -
> pool/lhm used 1.00M -
> pool/lhm available 0 -
> pool/lhm referenced 1.00M -
> pool/lhm compressratio 7.25x -
> pool/lhm mounted yes -
> pool/lhm quota 1M local
> pool/lhm reservation none default
> pool/lhm recordsize 128K default
>
> But I cp 10 files,per file size is 2.4M to pool/lhm
> #ll -h /pool/lhm
> total 1013
> -rw------- 1 root wheel 2.4M Oct 7 17:18 d
> -rw------- 1 root wheel 2.4M Oct 7 17:19 dd
> -rw------- 1 root wheel 2.4M Oct 7 17:19 ddd
> -rw------- 1 root wheel 2.4M Oct 7 17:19 dddd
> -rw------- 1 root wheel 2.4M Oct 7 17:19 ddddd
> -rw------- 1 root wheel 2.4M Oct 7 17:19 dddddd
> -rw------- 1 root wheel 2.4M Oct 7 17:19 dddddd2
> -rw------- 1 root wheel 2.4M Oct 7 17:19 dddddd24
> -rw------- 1 root wheel 2.1M Oct 7 17:19 dddddd247
> -rw------- 1 root wheel 2.4M Oct 7 17:18 kldstat.core
>
> #du -hs /pool/lhm
> 1.0M .
>
> I am puzzled,the what's zfs quota mean?
> I understand is file quota,that can't put files which total size larger than 1M.
> But it seems my understanding is wrong.
> Anybody give a idea?

I can confirm and reproduce what you're seeing.

Based on all of the ZFS documentation and examples I've read, it appears
to be a bug in FreeBSD ZFS.

CC'ing pjd@, who maintains ZFS on FreeBSD.

--
| 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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On Tue, Oct 07, 2008 at 12:07:26PM +0200, Holger Kipp wrote:
> On Tue, Oct 07, 2008 at 02:54:37AM -0700, Jeremy Chadwick wrote:
> > On Tue, Oct 07, 2008 at 05:32:43PM +0800, lhmwzy wrote:
> > > I create a zfs volume pool/lhm and give it quota 1M use "zfs set
> > > quota=1m pool/lhm"
>
> > I can confirm and reproduce what you're seeing.
> >
> > Based on all of the ZFS documentation and examples I've read, it appears
> > to be a bug in FreeBSD ZFS.
> >
> > CC'ing pjd@, who maintains ZFS on FreeBSD.
>
> I can't confirm this on a recent 7-STABLE (yesterday):
>
> intserv2# zfs set quota=1m tank/test
> intserv2# cp /usr/ports/distfiles/samba-3.0.32.tar.gz /tank/test/
> cp: /tank/test/samba-3.0.32.tar.gz: Disc quota exceeded

Interesting. The system I'm testing on:

FreeBSD icarus.home.lan 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #0: Thu Oct 2 03:04:20 PDT 2008 root@icarus.home.lan:/usr/obj/usr/src/sys/PDSMI_PLUS_RELENG_7_amd64 amd64

Can you provide the output from "zfs get all tank tank/test"?
Below are mine.

Note that for the testing, I set the quota on storage/home to 4G, and
did "dd if=/dev/zero of=/home/filler bs=1g count=8". I've since
set the quota back to 16G.

NAME PROPERTY VALUE SOURCE
storage type filesystem -
storage creation Wed Sep 24 17:47 2008 -
storage used 181G -
storage available 1.16T -
storage referenced 180G -
storage compressratio 1.02x -
storage mounted yes -
storage quota none default
storage reservation none default
storage recordsize 128K default
storage mountpoint /storage default
storage sharenfs off default
storage checksum on default
storage compression on local
storage atime on local
storage devices on default
storage exec on default
storage setuid on default
storage readonly off default
storage jailed off default
storage snapdir hidden default
storage aclmode groupmask default
storage aclinherit secure default
storage canmount on default
storage shareiscsi off default
storage xattr off temporary
storage copies 1 default

storage/home type filesystem -
storage/home creation Wed Sep 24 20:26 2008 -
storage/home used 944M -
storage/home available 14.1G -
storage/home referenced 944M -
storage/home compressratio 1.25x -
storage/home mounted yes -
storage/home quota 15G local
storage/home reservation none default
storage/home recordsize 128K default
storage/home mountpoint /home local
storage/home sharenfs off default
storage/home checksum on default
storage/home compression on inherited from storage
storage/home atime on inherited from storage
storage/home devices on default
storage/home exec on default
storage/home setuid on default
storage/home readonly off default
storage/home jailed off default
storage/home snapdir hidden default
storage/home aclmode groupmask default
storage/home aclinherit secure default
storage/home canmount on default
storage/home shareiscsi off default
storage/home xattr off temporary
storage/home copies 1 default

Filesystem Size Used Avail Capacity Mounted on
storage 1.3T 180G 1.2T 13% /storage
storage/home 15G 944M 14G 6% /home

--
| 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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On Tue, Oct 07, 2008 at 02:54:37AM -0700, Jeremy Chadwick wrote:
> On Tue, Oct 07, 2008 at 05:32:43PM +0800, lhmwzy wrote:
> > I create a zfs volume pool/lhm and give it quota 1M use "zfs set
> > quota=1m pool/lhm"
> >
> > #zfs get all pool/lhm
> > zfs get all pool/lhm
> > [ttyp0][5:22:12pm]
> > NAME PROPERTY VALUE SOURCE
> > pool/lhm type filesystem -
> > pool/lhm creation Tue Oct 7 17:14 2008 -
> > pool/lhm used 1.00M -
> > pool/lhm available 0 -
> > pool/lhm referenced 1.00M -
> > pool/lhm compressratio 7.25x -

Turn compression off and retry.

--
Pawel Jakub Dawidek http://www.wheel.pl
pjd@FreeBSD.org http://www.FreeBSD.org
FreeBSD committer Am I Evil? Yes, I Am!

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On Tue, Oct 07, 2008 at 03:12:59AM -0700, Jeremy Chadwick wrote:
> On Tue, Oct 07, 2008 at 12:07:26PM +0200, Holger Kipp wrote:
> > On Tue, Oct 07, 2008 at 02:54:37AM -0700, Jeremy Chadwick wrote:
> > > On Tue, Oct 07, 2008 at 05:32:43PM +0800, lhmwzy wrote:
> > > > I create a zfs volume pool/lhm and give it quota 1M use "zfs set
> > > > quota=1m pool/lhm"
> >
> > > I can confirm and reproduce what you're seeing.
> > >
> > > Based on all of the ZFS documentation and examples I've read, it appears
> > > to be a bug in FreeBSD ZFS.
> > >
> > > CC'ing pjd@, who maintains ZFS on FreeBSD.
> >
> > I can't confirm this on a recent 7-STABLE (yesterday):
> >
> > intserv2# zfs set quota=1m tank/test
> > intserv2# cp /usr/ports/distfiles/samba-3.0.32.tar.gz /tank/test/
> > cp: /tank/test/samba-3.0.32.tar.gz: Disc quota exceeded
>
> Interesting. The system I'm testing on:
>
> FreeBSD icarus.home.lan 7.1-PRERELEASE FreeBSD 7.1-PRERELEASE #0: Thu Oct 2 03:04:20 PDT 2008 root@icarus.home.lan:/usr/obj/usr/src/sys/PDSMI_PLUS_RELENG_7_amd64 amd64
>
> Can you provide the output from "zfs get all tank tank/test"?
> Below are mine.
>
> Note that for the testing, I set the quota on storage/home to 4G, and
> did "dd if=/dev/zero of=/home/filler bs=1g count=8". I've since
> set the quota back to 16G.
>
> NAME PROPERTY VALUE SOURCE
> storage compressratio 1.02x -
>
> storage/home type filesystem -
> storage/home compressratio 1.25x -

I am not sure if you get correct results with /dev/zero and
enabled compression. A file that only contains null bytes won't
grow very fast in compressed form.

You might want to create storage/test and disable compression
for this, then set a limit of 1M or larger (if you like) and try
once again.

I currently have a pool defined without general compression and
just used

# zfs create tank/test
# zfs set quota=1m tank/test
# cp /usr/ports/distfiles/samba-3.0.32.tar.gz /tank/test/
cp: /tank/test/samba-3.0.32.tar.gz: Disc quota exceeded

# zfs destroy tank/test

and compressration is a very steady 1.00x ;-)

Best regards,
Holger Kipp
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On Tue, Oct 07, 2008 at 03:30:09AM -0700, Jeremy Chadwick wrote:
> On Tue, Oct 07, 2008 at 12:17:55PM +0200, Pawel Jakub Dawidek wrote:
> > Turn compression off and retry.
>
> Yep, that's the key!
>
> # zfs set quota=4g storage/home
> # zfs set compression=off storage
> # zfs get compression,quota,mountpoint
> NAME PROPERTY VALUE SOURCE
> storage compression off local
> storage quota none default
> storage mountpoint /storage default
> storage/home compression off inherited from storage
> storage/home quota 4G local
> storage/home mountpoint /home local
>
> # dd if=/dev/zero of=/home/filler bs=1g count=8
> dd: /home/filler: Disc quota exceeded
> 4+0 records in
> 3+1 records out
> 3306553344 bytes transferred in 62.566567 secs (52848566 bytes/sec)
>
> # df -h /home
> Filesystem Size Used Avail Capacity Mounted on
> storage/home 4.0G 4.0G 0B 100% /home
>
> I had no idea compression could cause this. A useful feature, but
> obviously can result in misleading results... :-)

Yeah, ZFS offers a lot, which can create confusion, unfortunately. Do we
limit physical space with quota or only logical (before compression)?
Should we take space consumed by snapshots into account or not? etc.

--
Pawel Jakub Dawidek http://www.wheel.pl
pjd@FreeBSD.org http://www.FreeBSD.org
FreeBSD committer Am I Evil? Yes, I Am!

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sorry,I make a mistake.
It is a filesystem,not a volume.

2008/10/7 Holger Kipp :
> according to zfs manpage:
>
> Quotas cannot be set on volumes, as the "volsize" property acts as
> an implicit quota.
>
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