ZFS feature flags 9.2 -> 8.4?

[Trond Endrestøl]

On Mon, 2 Jun 2014 10:08+0200, Patrick M. Hausen wrote:

> Hi, all,
> 
> can a zpool with these feature flags from RELENG_9_2 be accessed
> and booted (!) by a RELENG_8_4 system?
> 
> FEAT DESCRIPTION
> -------------------------------------------------------------
> async_destroy                         (read-only compatible)
>      Destroy filesystems asynchronously.
> empty_bpobj                           (read-only compatible)
>      Snapshots use less space.
> lz4_compress                         
>      LZ4 compression algorithm support.
> 
> There is a chance I need to downgrade a production system.
> Not quite sure yet, but I wanted to check the possibilities ...
> 
> Thanks a lot,
> Patrick

r248810 of 
releng/8.4/cddl/contrib/opensolaris/cmd/zpool/zpool-features.7 claims 
to support the features you have listed.

See 
http://svnweb.freebsd.org/base/releng/8.4/cddl/contrib/opensolaris/cmd/zpool/zpool-features.7?revision=248810&view=markup

-- 
+-------------------------------+------------------------------------+
| Vennlig hilsen,               | Best regards,                      |
| Trond Endrestøl,              | Trond Endrestøl,                   |
| IT-ansvarlig,                 | System administrator,              |
| Fagskolen Innlandet,          | Gjøvik Technical College, Norway,  |
| tlf. mob.   952 62 567,       | Cellular...: +47 952 62 567,       |
| sentralbord 61 14 54 00.      | Switchboard: +47 61 14 54 00.      |
+-------------------------------+------------------------------------+