That is a touch misleading.  This has always been the case since S10u2.  You 
have to create the pool AND the file systems at the oldest versions you want to 

I maintain a table of pool and version numbers on my blog ( 
com/bobn) for this very purpose.   I got lazy the other day and made this 
mistake between 11ga and 11.1.  

Watch the ZFS send approach because you might be sending a newer file system 
version than is supported.  Yes, I've done that too :)


Sent from my iPhone

On Dec 13, 2012, at 10:47 AM, Jan Owoc <> wrote:

> Hi,
> On Thu, Dec 13, 2012 at 9:14 AM, sol <> wrote:
>> Hi
>> I've just tried to use illumos (151a5)  import a pool created on solaris
>> (11.1) but it failed with an error about the pool being incompatible.
>> Are we now at the stage where the two prongs of the zfs fork are pointing in
>> incompatible directions?
> Yes, that is correct. The last version of Solaris with source code
> used zpool version 28. This is the last version that is readable by
> non-Solaris operating systems FreeBSD, GNU/Linux, but also
> OpenIndiana. The filesystem, "zfs", is technically at the same
> version, but you can't access it if you can't access the pool :-).
> If you want to access the data now, your only option is to use Solaris
> to read it, and copy it over (eg. with zfs send | recv) onto a pool
> created with version 28.
> Jan
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