On 2015.04.20 13:10, T L wrote: > So if I use a feature which has a new compression scheme (just to pick an > example) and then I later move the pool to an OS which doesn't support that > scheme, how could this not disable access to the data? 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. Get to know which systems you'll be encountering and what they will support (and also which features you consider important).