zfs discuss - Nov 2009 - ZFS send / recv to a lower ZFS version

Hi,

We are using multiple opensolaris 06/09 and solaris 10 servers. 
Currently we are ''dumping'' (incremental)backups to a backup
server. I
wonder if anybody knows what happens when I send/recv a zfs volume from 
version 15 to a (backup) system with version 14. I''ve the feeling
it''s
not very wise to do, but is it doable and what kind of caveats can be 
expected. Probably we will upgrade the backup system to version 15 
sometime soon.

I did a search run on the maillist & google but weren''t able to
find an
answer. Sorry if I missed something.


Regards,

Mart van Santen



-- 
Greenhost - Duurzame Hosting
Derde Kostverlorenkade 35
1054 TS Amsterdam
T: 020 489 4349
F: 020 489 2306
KvK: 34187349

On Nov 19, 2009, at 7:39 AM, Mart van Santen wrote:
> Hi,
>
> We are using multiple opensolaris 06/09 and solaris 10 servers.  
> Currently we are ''dumping'' (incremental)backups to a
backup server.
> I wonder if anybody knows what happens when I send/recv a zfs volume  
> from version 15 to a (backup) system with version 14. I''ve the  
> feeling it''s not very wise to do, but is it doable and what kind
of
> caveats can be expected. Probably we will upgrade the backup system  
> to version 15 sometime soon.
You are referring to the zpool version, not the zfs version.  The latest
zfs version is 4.  To see the available zfs versions use, "zfs upgrade  
-v"

Cindy, this doesn''t come up very often, probably because there have
only been 4 zfs versions,  but perhaps it deserves mention in the
"Receiving a ZFS Snapshot" section of the ZFS Admin Guide.
  -- richard

Richard Elling wrote:
> On Nov 19, 2009, at 7:39 AM, Mart van Santen wrote:
>> Hi,
>>
>> We are using multiple opensolaris 06/09 and solaris 10 servers. 
>> Currently we are ''dumping'' (incremental)backups to a
backup server. I
>> wonder if anybody knows what happens when I send/recv a zfs volume 
>> from version 15 to a (backup) system with version 14. I''ve the
>> feeling it''s not very wise to do, but is it doable and what
kind of
>> caveats can be expected. Probably we will upgrade the backup system 
>> to version 15 sometime soon.
>
> You are referring to the zpool version, not the zfs version.  The latest
> zfs version is 4.  To see the available zfs versions use, "zfs upgrade
> -v"
>
> Cindy, this doesn''t come up very often, probably because there
have
> only been 4 zfs versions,  but perhaps it deserves mention in the
> "Receiving a ZFS Snapshot" section of the ZFS Admin Guide.
You are right, I''m mixing up zpool and zfs versions. But, in this case 
I''m backing up/transfering zfs volumes, and if I request version 
information about a zfs volume, the value for version is empty. Still I 
have problems with send/recv to an older zpool version, but I don''t
know
of this can be the cause or maybe something else is wrong..

Regards,

Mart

>  -- richard
>

-- 
Greenhost - Duurzame Hosting
Derde Kostverlorenkade 35
1054 TS Amsterdam
T: 020 489 4349
F: 020 489 2306
KvK: 34187349

On Nov 20, 2009, at 1:47 AM, Mart van Santen wrote:
> Richard Elling wrote:
>> On Nov 19, 2009, at 7:39 AM, Mart van Santen wrote:
>>> Hi,
>>>
>>> We are using multiple opensolaris 06/09 and solaris 10 servers.  
>>> Currently we are ''dumping'' (incremental)backups
to a backup
>>> server. I wonder if anybody knows what happens when I send/recv a  
>>> zfs volume from version 15 to a (backup) system with version 14.  
>>> I''ve the feeling it''s not very wise to do, but is
it doable and
>>> what kind of caveats can be expected. Probably we will upgrade the
>>> backup system to version 15 sometime soon.
>>
>> You are referring to the zpool version, not the zfs version.  The  
>> latest
>> zfs version is 4.  To see the available zfs versions use, "zfs  
>> upgrade -v"
>>
>> Cindy, this doesn''t come up very often, probably because there
have
>> only been 4 zfs versions,  but perhaps it deserves mention in the
>> "Receiving a ZFS Snapshot" section of the ZFS Admin Guide.
>
> You are right, I''m mixing up zpool and zfs versions. But, in this
> case I''m backing up/transfering zfs volumes, and if I request  
> version information about a zfs volume, the value for version is  
> empty. Still I have problems with send/recv to an older zpool  
> version, but I don''t know of this can be the cause or maybe  
> something else is wrong..
I tested this before I posted yesterday and it worked fine.
What error messages are you seeing?
  -- richard