On Wed, Dec 5, 2018 at 9:21 PM Josh Paetzel <j...@tcbug.org> wrote: > There was a proposal on this mailing list a week or so ago that sparked > some good discussion regarding setting feature flags at pool creation. We > discussed this proposal on the last OpenZFS call and while we all agreed it > was a good idea, we felt the UI could use a little workshopping. >
Thanks for leading this discussion, Josh! > > This proposal is simply a starting point for a discussion. > > The proposal is to add an optional flag at zpool create time. -o features= > > which can be set to one of the following 4 settings: > > all: The default and the current behavior of zpool create. This setting > enables all features supported by the in use OpenZFS version. > > compat: Enable async_destroy, empty_bpobj, filesystem_limits, > lz4_compress, spacemap_histogram, extensible_dataset, bookmarks, > enabled_txg, and hole_birth. This set of features is supported by > FreeBSD/FreeNAS 9.3 (July of 2014), ZoL 0.6.4 ( 0.6.5.6 was used in Ubuntu > 16.04 LTS), and Illumos in the early to mid 2014 era. > I think the term "portable" is more specific than "compat[ible]", so "-o features=portable" is probably a better name. Thanks to whoever suggested that at the meeting Tuesday. I think that the definition of "-o features=portable" needs to change over time, as features become more widely available. Do you have thoughts on how specifically we should do that? > > min: enable async_destroy, empty_bpobj, and lz4_compress. I believe all > available OpenZFS v5000 implementations support these 3 features, and > certainly without at least async_destroy you can get pools very very very > cranky. (This would be IllumOS and FreeBSD in the late 2013 range, I don't > think there's an analog in the ZoL world that would be widely used, but I > believe the ZoL work started with v5000 so it should work on the earliest > of releases eg: 0.6.1 in early 2015) > > none: enable no features at all. Some masochists^H^H^H^H^H^H^H^H^Hpeople > may want to manually enable a set of features. > > -- > > Thanks, > > Josh Paetzel > > ------------------------------------------ > openzfs: openzfs-developer > Permalink: > https://openzfs.topicbox.com/groups/developer/T562a2f6ecf883736-Mc7d9f68fc4e13c24f6166151 > Delivery options: > https://openzfs.topicbox.com/groups/developer/subscription > ------------------------------------------ openzfs: openzfs-developer Permalink: https://openzfs.topicbox.com/groups/developer/T562a2f6ecf883736-M7768f65ae33fa60d2dc56527 Delivery options: https://openzfs.topicbox.com/groups/developer/subscription
