In freenas they have encryption. If you turn encryption on, you will not be able to export/import the pool to another distro. So yes there are features that won't cross boundaries. I would encourage you not to use these kinds of features if you want movement. Most features that are defined as "flags" currently will not make it unimportable. Like space histogram in zol. You will still be able to calculate free space, but not as efficiently for large files. V28 might make your pool unmovable at some point, although currently all distros support import and upgrade of v28 pool. Getting to v5000 will help you adapt to the next phase of changing conditions. linda On 4/21/15 9:08 AM, Munir Nassar wrote: > On Tue, Apr 21, 2015 at 7:33 AM, Andrew Berg > <aberg010 at my.hennepintech.edu> wrote: > >> See the zpool-features man page. It varies by feature. Some will completely >> prevent import in this case, while others may simply only make the pool >> read-only. Also, some features are not mandatory at upgrade time and will not >> be enabled automatically. If a feature is disabled, support for it is not >> required for import. > This is a bit misleading, as the feature would need to have been > disabled from the start. > > Lets say i create a feature of supercompressor which compresses > everything with my super secret proprietary algorithm(so secret that > even decrypting is a closely held secret), disabling this feature only > affect NEW blocks and old blocks will remain compressed with this > proprietary compressor rendering the pool unimportable by a ZFS > implementation that does not understand the supercompressor feature > flag. > _______________________________________________ > TCLUG Mailing List - Minneapolis/St. Paul, Minnesota > tclug-list at mn-linux.org > http://mailman.mn-linux.org/mailman/listinfo/tclug-list