zfs discuss - Feb 2009 - Two zvol devices one volume?

Hi,

Can anyone explain the following to me?

Two zpool devices points at the same data, I was installing osol  
2008.11 in xVM when I saw that there already was a partition on the  
installation disk. An old dataset that I deleted since i gave it a  
slightly different name than I intended is not removed under /dev. I  
should not have used that name, but two device links should perhaps  
not point to the same device ether....

zfs list |grep xvm/dsk
zpool01/xvm/dsk                 25.0G  2.63T  24.0K  /zpool01/xvm/dsk
zpool01/xvm/dsk/osol01-dsk01      10G  2.64T  2.53G  -
zpool01/xvm/dsk/ubuntu01-dsk01    10G  2.64T  21.3K  -

# ls -l /dev/zvol/dsk/zpool01/xvm/dsk
total 3
lrwxrwxrwx   1 root     root          41 Feb 10 18:19 osol01-dsk01 - 
 > ../../../../../../devices/pseudo/zfs at 0:4c
lrwxrwxrwx   1 root     root          41 Feb 10 18:14 ubuntu-01-dsk01 - 
 > ../../../../../../devices/pseudo/zfs at 0:4c
lrwxrwxrwx   1 root     root          41 Feb 10 18:19 ubuntu01-dsk01 - 
 > ../../../../../../devices/pseudo/zfs at 0:5c

# zpool history |grep xvm
2009-02-08.22:42:12 zfs create zpool01/xvm
2009-02-08.22:42:23 zfs create zpool01/xvm/media
2009-02-08.22:42:45 zfs create zpool01/xvm/dsk
2009-02-10.18:14:41 zfs create -V 10G zpool01/xvm/dsk/ubuntu-01-dsk01
2009-02-10.18:15:10 zfs destroy zpool01/xvm/dsk/ubuntu-01-dsk01
2009-02-10.18:15:21 zfs create -V 10G zpool01/xvm/dsk/ubuntu01-dsk01
2009-02-10.18:15:33 zfs create -V 10G zpool01/xvm/dsk/osol01-dsk01

# uname -a
SunOS ollespappa 5.11 snv_107 i86pc i386 i86xpv

While I am writing, is there any known issues with sharemgr and zfs in  
this release? svc:/network/shares/group:zfs hangs when going down  
since sharemgr stop zfs never returns...

Thanks

Henrik Johansson
http://sparcv9.blogspot.com

I tried to export the zpool also, and I got this, the strange part is  
that it sometimes still thinks that the ubuntu-01-dsk01 dataset exists:

# zpool export zpool01
cannot open ''zpool01/xvm/dsk/ubuntu-01-dsk01'': dataset does
not exist
cannot unmount ''/zpool01/dump'': Device busy

But:
# zfs destroy zpool01/xvm/dsk/ubuntu-01-dsk01
cannot open ''zpool01/xvm/dsk/ubuntu-01-dsk01'': dataset does
not exist

Regards


On Feb 12, 2009, at 11:51 PM, Henrik Johansson wrote:
> Hi,
>
> Can anyone explain the following to me?
>
> Two zpool devices points at the same data, I was installing osol  
> 2008.11 in xVM when I saw that there already was a partition on the  
> installation disk. An old dataset that I deleted since i gave it a  
> slightly different name than I intended is not removed under /dev. I  
> should not have used that name, but two device links should perhaps  
> not point to the same device ether....
>
> zfs list |grep xvm/dsk
> zpool01/xvm/dsk                 25.0G  2.63T  24.0K  /zpool01/xvm/dsk
> zpool01/xvm/dsk/osol01-dsk01      10G  2.64T  2.53G  -
> zpool01/xvm/dsk/ubuntu01-dsk01    10G  2.64T  21.3K  -
>
> # ls -l /dev/zvol/dsk/zpool01/xvm/dsk
> total 3
> lrwxrwxrwx   1 root     root          41 Feb 10 18:19 osol01-dsk01 - 
> > ../../../../../../devices/pseudo/zfs at 0:4c
> lrwxrwxrwx   1 root     root          41 Feb 10 18:14 ubuntu-01- 
> dsk01 -> ../../../../../../devices/pseudo/zfs at 0:4c
> lrwxrwxrwx   1 root     root          41 Feb 10 18:19 ubuntu01-dsk01  
> -> ../../../../../../devices/pseudo/zfs at 0:5c
>
> # zpool history |grep xvm
> 2009-02-08.22:42:12 zfs create zpool01/xvm
> 2009-02-08.22:42:23 zfs create zpool01/xvm/media
> 2009-02-08.22:42:45 zfs create zpool01/xvm/dsk
> 2009-02-10.18:14:41 zfs create -V 10G zpool01/xvm/dsk/ubuntu-01-dsk01
> 2009-02-10.18:15:10 zfs destroy zpool01/xvm/dsk/ubuntu-01-dsk01
> 2009-02-10.18:15:21 zfs create -V 10G zpool01/xvm/dsk/ubuntu01-dsk01
> 2009-02-10.18:15:33 zfs create -V 10G zpool01/xvm/dsk/osol01-dsk01
>
> # uname -a
> SunOS ollespappa 5.11 snv_107 i86pc i386 i86xpv
>
> While I am writing, is there any known issues with sharemgr and zfs  
> in this release? svc:/network/shares/group:zfs hangs when going down  
> since sharemgr stop zfs never returns...
>
> Thanks
>
> Henrik Johansson
> http://sparcv9.blogspot.com
>
>
>
> _______________________________________________
> zfs-discuss mailing list
> zfs-discuss at opensolaris.org
> http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Henrik Johansson
http://sparcv9.blogspot.com

Henrik Johansson wrote:
> I tried to export the zpool also, and I got this, the strange part is 
> that it sometimes still thinks that the ubuntu-01-dsk01 dataset exists:
> 
> # zpool export zpool01
> cannot open ''zpool01/xvm/dsk/ubuntu-01-dsk01'': dataset
does not exist
> cannot unmount ''/zpool01/dump'': Device busy
> 
> But:
> # zfs destroy zpool01/xvm/dsk/ubuntu-01-dsk01
> cannot open ''zpool01/xvm/dsk/ubuntu-01-dsk01'': dataset
does not exist
> 
> Regards
I have seen this ''phantom dataset'' with a pool on nv93. I
created a
zpool, created a dataset, then destroyed the zpool. When creating a new 
zpool on the same partitions/disks as the destroyed zpool, upon export I 
receive the same message as you describe above, even though I never 
created the dataset in the new pool.

Creating a dataset of the same name and then destroying it doesn''t seem
to get rid of it, either.

I never did remember to file a bug for it...

> 
> I have seen this ''phantom dataset'' with a pool on nv93. I
created a
> zpool, created a dataset, then destroyed the zpool. When creating a new 
> zpool on the same partitions/disks as the destroyed zpool, upon export I 
> receive the same message as you describe above, even though I never 
> created the dataset in the new pool.
> 
> Creating a dataset of the same name and then destroying it doesn''t
seem
> to get rid of it, either.
> 
The solution for your case be on this post, if not file a bug:
http://www.opensolaris.org/jive/thread.jspa?messageID=311573&#311573
-- 
This message posted from opensolaris.org

Thanks for the info Dave, I filed a bug on this: 6805659.

Regards
Henrik
On Feb 13, 2009, at 1:30 AM, Dave wrote:
>
>
> Henrik Johansson wrote:
>> I tried to export the zpool also, and I got this, the strange part  
>> is that it sometimes still thinks that the ubuntu-01-dsk01 dataset  
>> exists:
>> # zpool export zpool01
>> cannot open ''zpool01/xvm/dsk/ubuntu-01-dsk01'':
dataset does not exist
>> cannot unmount ''/zpool01/dump'': Device busy
>> But:
>> # zfs destroy zpool01/xvm/dsk/ubuntu-01-dsk01
>> cannot open ''zpool01/xvm/dsk/ubuntu-01-dsk01'':
dataset does not exist
>> Regards
>
> I have seen this ''phantom dataset'' with a pool on nv93. I
created a
> zpool, created a dataset, then destroyed the zpool. When creating a  
> new zpool on the same partitions/disks as the destroyed zpool, upon  
> export I receive the same message as you describe above, even though  
> I never created the dataset in the new pool.
>
> Creating a dataset of the same name and then destroying it doesn''t
> seem to get rid of it, either.
>
> I never did remember to file a bug for it...
Henrik Johansson
http://sparcv9.blogspot.com